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                                                                                                                     GROUP INDEX
    Service Manual                                                                             General ...............................................

                                                                                               Fusible Link and Fuse Location ...........

                                                                                               Inspection Terminal Location ...............

                                                                                               Grounding Location ...............................
                                                                                               Diode Location .......................................
                         Volume 2
                                                                                              Junction Block ........................................
            Body & Electrical
                                                                                              Centralized Junction ..............................
This Service Manual has been prepared with the                                                Inspection of Harness Connector.. .......
latest service information available at the time of
publication. It is subdivided into various group
categories and each section contains diagnostic,                                              Configuration Diagrams ........................
disassembly, repair, atid installation prbcedures
along with complete specifications and tightening                                             Circuit Diagrams .....................................
references. Use of this manual will aid in properly
performing any servicing necessary to maintain or
restore the high levels of performance and reliability                                        Steering ...................................................
designed into these outstanding vehicles.
                                                                                              4Wheel Steering System .......................
                                                                                              Body .........................................................

                                  WE SUPPORT
                             VOLUNTARY TECHNICIAN
                             CERTIFICATION THROUGH
                                                                                              Heater, Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . .   Ia
                                                                                              and Ventilation
                                                                                              Engine Electrical . . . . . . . . . . . . . ..*...............

                                                                                              Chassis Electrical .............................

                                                                                              Alphabetic Index ...............................

                  A MITSUBISHI

                                                                                               For information concerning all components
                                                                                               other than the electrical system and on-
Mltsubishl M o t o r s Corporation r e s e r v e s t h e right t o m a k e c h a n g e s in
design or to make addltlons to or Improvements In Its p r o d u c t s wlthout
                                                                                               vehicle service procedures for engines and
lmposmg a n y obllgatlons u p o n Itself to mstall t h e m o n Its p r o d u c t s             transmissions, refer to Volume 1 "Chassis
previously m a n u f a c t u r e d                                                             & Body" of this paired Service Manual.
                                                                                               For overhaul procedures of engines or
                                                                                               transmissions, refer to the separately issued
0 1992 Mitsubishi Motors Corporation                                 ReprinWdinUSA             Engine Service Manual or Manual/Auto-
                                                                                                matic Transmission Service Manual.
2                   GENERAL - Fusible Link and Fuse Location

FUSIBLE LINK AND FUSE LOCATION                                                                 M16BA-

                                                               Name                        Symbol
         cm     a
                                          Dedicated fuse block                                B

                                          Fusible link box (main fusible links and sub

                                         (I) For details of fusible link and fuse, refer to P.12.
                                         (2) ;rhdee;`Name" column is arranged in alphabetical


                                              q \\ i


                         TSB Revision
                                  GENERAL - Inspection Terminal Location                                        3
                      Name                    Symbol                              Name                 Symbol
  Engine speed detection connector*           C       Oxgen sensor check connector           D
  Fuel pump check connector                        A        Data link connector                          E
  Ignition timing adjustment connector             B
(1) *: 
(2) The "Name" column is arranged in alphabetical

       I                      -                I


             Oxgen sensor
4                      GENERAL - Grounding Location




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                         e - Grounding Location                     5


      MFI control unit


6                        GENERAL - Grounding Location
     From 1990 models



                        1 TSB Revision
                                           GENERAL - Diqde Location                                                  7:

I                                                   I                                                                 1
I                         Name                      1 Symbol                       Name                      1 Symbol 1
    Diode (4WS fluid level warning light circuit)       A      Diode (auto-cruise control circuit)
    Diode (ABS circuit)                                 B
                                                    IL Diode (theft-alarm system circuit)
                                                               Diode (sunroof circuit)        C
1 Diode (ACTIVE-ESC circuit)
    Diode (AJT fluid temperature warning
    light circuit)                              A

The "Name" column is arranged in alphabetical order.



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8                                        GENERAL - Junction Block

JUNCTION BLOCK                                                                                                   MlWG.

:Up t o 1990 models>

                                     T              I

                                                                                          I       t


 1) The alphabetical symbols used for connectors correspond to the alphabetical symbols for connectors on next page.
`2) The (   ) indicates the connection terminal at the harness side.

                                    TSB Revision                                I

                                                                                                                         . .
                                  GENERAL - Junction Block

                                              To front

                                            -To roof

                                            To instrument
                                            panel harness
                                                                       To body

No         -                                Heater
connection                                  relay

                                            Fuse block

               c !! - II - I

               \   I   I   ,
                                  16A6661                    16A0002

                               TSB Revision
10                                      GENERAL - Junction Block


                                                                                I I   i
                                                                    -                 -


                                                                    -                 -

                                                                    f   5-U J

(1) The alphabetical symbols used for connectors correspond to the alphabetical symbols for connectors on next page.
(2) The (     ) indicates the connection terminal at the harness side.

                                     TSB Revision
                                GENERAL - Junction ~Block                             71

             1 Front side 1                            1 Reverse side 1

                                  -To roof

                                    To front
                                    To instrument
                                    panel harness
                                                                            To body
                                                                          * harness

                                     Fuse block


                              TSB Revision                  I
12                                   GENERAL - Centralized Junction

CENTRALIZED JUNCTION                                                                                 M16BB-

MAIN FUSIBLE LINK (direct connection to battery's positive 0 terminal)

 No.     Circuit                                                     Housing color     Rated capacity (A)

  1      Generator circuit                                           Black*`, BIue*2      80*`, 1 oo*2

  2      ABS circuit (control unit power supply)                          Blue                20

  3      ABS circuit (hydraulic unit power supply)                       Yellow               60



       1989 models                           1990 models                     From 1990.5 models



       1989 models                         From 1990 models


                                    1 TSB Revision
                                          GENERAL - Centralized Junction
SUB FUSIBLE LfNK (relay box inside engine compartment, fusible link box)

 No.   Circuit                                                           Housing color   Rated capacity (Al

  1    Junction block (Multipurpose fuse @,@,@I, 0, @, 0.0)
       A/C circuit                                                           Yellow              60

  2    Power window circuit                                                   Pink              30
  3    ACTIVE-ECS circuit                                                    Green              40
  4    Defogger circuit                                                       Pink              30
  5    ignition switch and generator circuit                                  Pink              30
  6    Radiator fan motor and condenser fan motor circuit                     Pink              30
  7    Headlight and tail light circuit                                      Green              40
 8     MFI circuit                                                           Blue               20
 9     Automatic seatbelt circuit                          Pink               30



                                            El        El
                                         83 q         a
                                                      1  J

                                 Sub fusible link      16AO567


       1990 models                                  From 1990.5 models


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14                                    GENERAL - Centralized Junction
MULTI-PURPOSE FUSE (inside junction block)

  Power supply circuit   No.   Rated capacity (A) Load circuit
 Ignition        IG2      1              IO           EPS control unit
                          2              10        Heater relay, blower switch, defogger timer, power window
                                                   relay (Vehicles without ETACS), sunroof power relay (Vehicles
                                                   without ETACS), ABS power relay, ACTIVE-ECS power relay
                ACC       3             10         Clock, motor antenna, radio, ETACS control unit*4
                          4             15         Remote-controlled mirror switch, cigarette lighter

 Sattery                  5             15         Door lock relay
 `gnition        IG2      6             10        Power/Economy change over switch , over drive
 switch                                           switch , park/neutral position switch , ELC
                                                  4-speed automatic transaxle control module, auto-cruise con-
                                                  trol unit 
                ACC      7              15         Wiper and washer, ETACS control unit*3, wiper relay
                          8             10        Headlight relay, horn
                 IG1     9              10        Combination meter, auto-cruise control switch, motor antenna,
                                                  ETACS control unit, seat belt timer*`, clutch pedal position switch
                         10             10        Hazard switch

 3attery                 11             20        ACTIVE-ECS power relay
                         12             20        -

                         13             20        Sunroof relay
                         14             30        Heater relay
                         15             15        Stop light, auto-cruise control unit 

 Jnition        IGl      16             10        Back-up light , park/neutral position switch 
 lattery                 17             IO        MFI control unit, clock, dome light, luggage compartment light,
                                                  door light, map light (Vehicles without sunroof), radio, ETACS
                                                  control unit, sunroof relay (Vehicles with ETACS), combination
                                                  meter, ELC 4-speed automatic transaxle control module, key re-
                                 ,'               minder switch, automatic seatbelt control unit*'

                         18            IO         -


                                                                            ' fuse

                                 1 TSB Revision                               I
                                  GENERAL - Centralized Junction                                                     15
DEDICATED FUSE (relay box inside engine compartment)

 Power supply circuit             No.       Rated capacity (A)        Housing color    Circuit
 Battery                           1                 10                   Red          Hazard light circuit
 Taillight relay (Battery)        2                  10                   Red          Taillight circuit
 Headlight relay (Battery)    1   3     (
 Battery                      141               15               I        Blue        I ECS circuit                   I
                                  5                  10                   Red          A/C compressor circuit
                                  6                  25,30*           transparent      Condenser fan motor circuit

 Headlight relay (Battery)        7                  15                   Blue         Fog light circuit

* : DOHC 

                             I Deciiczd f u s e

                                                                 03     m        El

                                  TSB Revision
 16                                  GENERAL - Centralized Junction

  Classification             Name                            Classification             Name
  Relay box in- A-01X        Headlight relay                 Passenger        C-72X     Power window relay
  side engine                                                compartment
  compartment A-02X          Taillight relay                 relay box        c-73x     Door lock relay

                   A-03X     Radiator fan motor relay (HI)
                   A-04X     Radiator fan motor relay (LO)
                                                                              c-75x    Defogger timer                  I
                   A-05X     Generator relay
                   A-06X     ACTIVE-ECS solenoid valve
                             power relay
                   A-07X     A/C compressor clutch relay
                   A-07-1X   Fog light relay
*I: <1989 models>
                                                                 relay box>






 Classification                                                        Name
 Relay box inside engine compartment                  A-07-2X          IOD or Storage Connector
IOD: Ignition Off Draw

                                     TSB Revision
GENERAL - Inspection of Harness Connector                                    17
              TOR                       mwcAAA
              Following procedures shall be followed for testing continuity and
              voltage at connector in order to prevent improper contact and
              deterioration of waterproof in connector.
              Check shall be done by inserting a probing needle from harness

              Do not insert probing needle from harness side as it will de-
              teriorates waterproof and cause for rusting. To inspect the
              energized circuit, use the ECI checker.


             When terminal stopper of connector is out of order, engagement
             of male and female terminals becomes improper even when con-
             nector itself is engaged perfectly and terminal sometimes slips out
             to rear side of connector. Ascertain, therefore, that each terminal
             does not come off connector by pulling each harness wire.

             Connector which gives loose engagement shall be rectified by
             removing female terminal from connector housing and raise its
             lance to establish securer engagement. Removal of connector
             housing and raise its lance to establish securer engagement. Re
             moval of connector terminal used for ECI and ELC 4 AK control
             circuit shall be done in the following manner.

             (1) Insert screwdriver il.4 mm (06 in.) width] as shown in the
                  figure, disengage front holder and remove it.
18                   GENERAL - Inspection of Harness Connector
                                              (2) Insert harness of terminal to be rectified deep into connector
                                                   from harness side and hold it there.

                                              (3) Insert tip of screwdriver [1.4 mm (06 in.) width] into connector
                                                  in a manner as shown in the figure, raise housing lance slightly
                                                  with it and pull out harness.
     Housing lance

                                                  Tool No. 753787-l supplied by AMP can be used instead of


                                              (4) Insert needle through a hole provided on terminal and raise
                                                   contact point of male terminal.

                     tr       Needle


                                              ROUND WATERPROOF CONNECTOR
                                              (1) Remove waterproof cap by using a screwdriver.
                                              (2) Insert tip of screwdriver (1.4 mm (06 in.) or 2.0 mm (.08 in.)
                                                   width] into connector in a manner as shown in the figure, raise
                                                   housing lance slightly with it and pull out harness.

              Housing lance


                                              (3) Inset-t screwdriver through a hole provided on terminal and
                                                   raise contact point of male terminal.

              B                16R1324

                                TSB Revision
                     GENERAL - Inspection of Harness Connector                                                   19
                                                RECTANGULAR WATERPROOF CONNECTOR
                                                (1) Disengage front holder by using a screwdriver and remove it.

I                              \\ 16R1326 I
                                                (2) Insert tip of screwdriver ("0.8 mm (.03 in.) width] into connec-
                                                    tor in a manner as shown in the figure, push it lightly to raise
                                                    housing lancer and pull out harness.
                                                    *If right size screwdriver is not available, convert a conven-
                                                    tional driver to suit the size.

          tiousing lance
                                   16R1326 I

                                               (3) Press contact point of male terminal down by holding a screw-
                                                   driver [1.4 mm (.06 in.) width] in a manner as shown in the

                                               INJECTOR CONNECTOR
                                               (1) Remove waterproof cap.

                                               (2) Insert tip of screwdriver (1.4 mm (06 in.) width] into connector
                                                   in a manner as shown in the figure, press in terminal lance and
                                                   pull out harness.
                                               (3) Press contact point of male terminal down by holding a screw-
                                                   driver [1.4 mm (06 in.) width] in a manner as shown in the

                                                  Correct lancer to be in proper condition before terminal is
                                                  inserted into connector.
    Terminal lance     ,wmSO         \
                               \ TSB Revision                                 I
20                                  GENERAL - `How to Diagnose

HOW TO DIAGNOSE                                                                                            M16DMC

The most important point in troubleshooting is to determine "Probable Causes". Once the probable causes are
determined, parts to be checked can be limited to those associated with such probable causes. Therefore, unnec-
essary checks can be eliminated. The determination of the probable causes must be based on a theory and be
supported by facts and must not be based on intuition only.
If an attempt is made to solve a problem without going through correct steps for troubleshooting, the problem
symptoms could become more complicated, resulting in failure to determine the causes correctly and making
incorrect repairs. The four steps below should be followed in troubleshooting.

                                               Observe the symptom carefully. Check if there are also other
 1   Observation of Problem Symptoms           problems.

                                               In determining the probable causes, it is necessary to check the
2 Determination of Probable Causes             wiring diagram to understand the circuit as a system. Knowledge
                                               of switches, relays and other parts is necessary for accurate de-
                                               termination. The causes of similar problems in the past must be
                                               taken into account.

II   Checking of Parts Associated with         Troubleshooting is carried out by making step by step checks until
3    Probable Causes and Determination         the true cause is found. Always go through the procedures con-
     of Faultv Parts                   I       sidering what check is to be made where for the best results.

4 Repair and Confirmation
                                               After the problems are corrected, be sure to check that the sys-
                                               tem operates correctly. Also check that new problems have not
                                               been caused by the repair.

This manual contains the cable diagrams as well as the individual circuit drawings, operational explanations,
and troubleshooting hints for each component required to facilitate the task of troubleshooting. The
information is compiled in the following manner:
(1) Cable diagrams show the connector positions, etc., on the actual vehicle as well as the harness path.
(2) Circuit drawings show the configuration of the circuit with all switches in their normal positions.
(3) Operational explanations include circuit drawings of voltage flow when the switch is operated and how
    the component operates in reaction.
(4) Troubleshooting hints include numerous examples of problems which might occur, traced backward in a
    common-sense manner to the origin of the trouble. Problems whose origins may not be found in this
    manner are pursued through the various system circuits.
    Components of ECI, ETACS, ECS, etc. with ECU do not include 3 and 4 above. For this information, refer
    to a manual which includes details of these components.

                                   TSB Revision
                                         GENERAL - How to Diagnose                                                      21

                                                    1. Visual and aural checks
                                                        Check relay operation, blower motor rotation, light illumina-
                                                        tion, etc. visually or aurally. The flow of current is invisible but
                                                        can be checked by the operation of the parts.

                                                    2. Simple checks
                                                        For example, if a headlight does not come on and a faulty fuse
                                                       or poor grounding is suspected, replace the fuse with a new
                                                       one or ground the light to the body by a jumper wire to deter-
                                                       mine which part is responsible for the problem.

                                                    3. Checking with instruments

                                   Pointer              Use an appropriate instrument in an adequate range and read
                                                       the indication correctly. You must have sufficient knowledge
    D                                                  and experience to handle instruments correctly.
    C                           so -
    V                        - \ OCV

         Changeover knob 1            1680224

                                                    INSPECTION INSTRUMENTS
                                                    In inspection, make use of the following instruments.
                                                    1. Test lights
                                                         A test light consists of a 12V bulb and lead wires. It is used
                                                         to check voltages or shortcircuits.


                                                    2. Self-power test light
                                                       A self-power test light consists of a bulb, batten/ and lead.
                                                       wires connected in series. It is used to check continuity or

                                     1 TSB Revision
22                                                GENERAL - How to Diagnose
                                                           3. Jumper wire
                                                               A jumper wire is used to close an open circuit. Never use one
                                                               to connect a power supply directly to a load.


 b                Power line
                                                          4. Voltmeter
                                                             A voltmeter is used to measure the circuit voltage. Normally,
                                                             the positive (red lead) probe is applied to the point of voltage
                                                             measurement and the negative (black lead) probe to the body

                                          Ground -

                                                          5. Ohmmeter
                                                             An ohmmeter is used to check continuity or measure resis-
                                                             tance of a switch or coil. If the measuring range has been
                                                             changed. the zero point must be adjusted before measure-

               Normal open (NO) type'                     CHECKING SWITCHES
        OFF                          ON                   In a circuit diagram, a switch is represented by a symbol and in the
                                                          idle state.
                                                          1. Normal open or normal close switch

      -1 x
                                                               Switches are classified into those which make the circuit open
                                                               and those which make the circuit closed when off.

Current does not flow          Curren; flows

               Normal cllOI;e (NC) type
         OFF                        ON

      ai a                        in
     Current flows         Current does not flow

                                            1 TSB Revision                              I
                                              GENERAL - How to Diagnose                                                   23
                                                         2. SWITCH CONNECTION
                                                             This figure illustrates a complex switch. The continuity
                                                             between terminals at each position is as indicated in the
                                                             table below.

                                                             1 st stage                 0   I                      n      0
                                                         I                                                                       4
                                                             2nd stage
                                                             3rd   staae
                                                             4th stage

                                                         W denotes continuity between terminals.


                                                         CHECKING RELAYS
                                                         1. When current flows through the coil of a relay, its core is
  Coil +                                    Spring          magnetized to attract the iron piece, closing (ON) the contact
                                                            at the tip of the iron piece. When the coil current is turned off,
                                            core            the iron piece is made to return to its original position by a
 Iron                                                       spring, opening the contact (OFF).

                                            1680231 I

                                                         2. By using a relay, a heavy current can be turned on and off
              Power supply
                                                            by a switch of small capacity. For example, in the circuit
                  I     I                                   shown here, when the switch is turned on (closed), current
                                                            flows to the coil of the relay. Then, its contact is turned on
                             Relay                          (closed) and the light comes on. The current flowing at this
                                                            time to the switch is the relay coil current only and is very

                  1     r                   16A0254

             Normal open (NO) type                       3. The relays may be classified into the normal open type and the
 Deenergized state 1         Energized state
                                                            normal close type by their contact construction.

                                                               The deenergized state means that no current is flowing
                                                               through the coil and the energized state means that current is
                                                               flowing through the coil.

Current does not flow       Current flows

                                        I            -

                                        1 TSB Revision
24                                          GENERAL - How to Diagnose

             Normal close (NC) type
  Deenergized state         Energized state
                                                        When a normal close type relay as illustrated here is checked,
                                                        there should be continuity between terminals (1) and (2) and
                                                        between terminals 3 and 4 when the relay is deenergized,

                                                        and the continuity should be lost between terminals 3 and 4
                                                        when the batten/ voltage is applied to the terminals 1 and 2. A

                                                        relay can be checked in this manner and it cannot be deter-
                                                        mine if a relay is okay or faulty by checking its state only when
                                                        it is deenergized (or energized).

     Current flows        Current does not flow

                                                    CHECKING FUSES
                                                   A blade type fuse has test taps provided to allow checking of
                                                   the fuse itself without removing it from the fuse block. The
                                                   fuse is okay if the test light comes on when its one lead is
                                                   connected to the test taps (one at a time) and the other lead is
                                                   grounded. (Change the ignition switch position adequately so
                                                   that the fuse circuit becomes live.)


State of fuse blown due to overcurrent             CAUTIONS IN EVENT OF BLOWN FUSE
                                                   When a fuse is blown, there are two probable causes as follows
                                                    : One is that it is blown due to flow of current exceeding its rating.
                                                   The other is that it is blown due to repeated on/off current flowing
                                                   through it. Which of the two causes is responsible can be easily
                                                   determined by visual check as described below.
                                                   (1) Fuse blown due to current exceeding rating
                                                        The illustration shows the state of a fuse blown due to this
                                                        cause. In this case, do not replace the fuse with a new one
                                                        hastily since a current heavy enough to blow the fuse has
                                                        flowed through it. First, check the circuit for shorting and
                                                        check for abnormal electric parts. Only after the correction of
                                                        such shorting or parts, fuse of the same capacity should be
                                                        used as a replacement. Never use a fuse of lager capacity than
                                                       the one that has blown. If such a fuse is used, electric parts or
                                                       wirings could be damaged before the fuse blows in the event
                                                       an overcurrent occurs again.

                                                   (2) Fuse blown due to repeated current on/off
                                                       The illustration shows the state of a fuse blown due to re
                                                       peated current on/off. Normally, this type of problem occurs
                                                       after fairly long period of use and hence is less frequent than
                                                       the above type. In this case, you may simply replace with a
                                                       new fuse of the same capacity.

                                         TSB Revision
 GENERAL - How to Diagnose                                                 25

           1. Check connections for looseness, rust and stains.
           2. Check terminals and wires for corrosion by battery electrolyte,
          3. Check terminals and wires for open circuit or impending open
          4. Check wire insulation and coating for damage, cracks and de-
          5. Check conductive parts of terminals for contact with other
              metallic parts (vehicle body and other parts).
          6. Check grounding parts to verify that there is complete conti-
              nuity between attaching bolt(s) and vehicle body.
          7. Check for incorrect wiring.
          8. Check that wirings are so clamped as to prevent contact with
              sharp corners of the vehicle body, etc. or hot parts (exhaust
              manifold, pipe, etc.).
          9. Check that wirings are clamped firmly to secure enough clear-
              ance from the fan pulley, fan belt and other rotating or moving
          10. Check that the wirings between the fixed parts such as the
              vehicle body and the vibrating parts such as the engine are
              made with adequate allowance for vibrations.

          When checking or servicing does not require power from the on-
          vehicle battery, be sure to disconnect the cable from the battery
          (-) terminal. This is to prevent problems that could be caused by
          shorting of the circuit. Disconnect the (-1 terminal first and recon-
          nect it last.
         1. Before connecting or disconnecting the negative cable,
              be sure to turn off the ignition switch and the lighting
             (If this is not done, there is the possibility of semicon-
             ductor parts being damaged.)
         2. For MFI-equipped models, after completion of the work
             steps [when the battery's negative (-) terminal is
             connected], warm up the engine and allow it to idle for
             approximately five minutes under the conditions des-
             cribed below, in order to stabilize engine control
             conditions, and then check to be sure that the idling is
             Engine coolant temperature: 85-95X (185-203

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