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MSA5TCD00L16061


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6-2a    [T7A1]                              DIAGNOSTICS
7. Diagnostics Chart for Power Line


7. Diagnostics Chart for Power
Line
A: BASIC DIAGNOSTICS
PROCEDURE
7A1 :    DRIVE AT CRUISE SPEED.

         : Can cruise speed be set?
         : Go to "CHECK INDICATOR AND CIR-
           CUIT IN CRUISE CONTROL MAIN
           SWITCH". 
         : Go to "CHECK CRUISE CONTROL
           MAIN SWITCH". 
B: CHECK INDICATOR AND CIRCUIT IN CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:
Bulb failure or open harness of the indicator circuit in the cruise control main switch.
WIRING DIAGRAM:




                                                                                           B6M1400




                                                     10
                                          DIAGNOSTICS                                         [T7B3] 6-2a
                                                                          7. Diagnostics Chart for Power Line


7B1 :   CHECK CRUISE CONTROL MAIN                        7B3 :    CHECK CIRCUIT BETWEEN CRUISE
        SWITCH.                                                   CONTROL MODULE AND CRUISE
                                                                  CONTROL MAIN SWITCH INDICATOR
                                                                  LIGHT.
1) Remove cruise control main switch.
2) Measure resistance between cruise control
main switch terminals.                                   1) Turn the ignition switch and cruise control main
                                                         switch to OFF.
Terminals                                                2) Remove the connector from the cruise control
    No. 1 -- No. 6:                                      main switch.
                                                         3) Measure resistance of ground circuit between
                                                         the cruise control main switch connector and
                                                         cruise control module connector.
                                                         Connector & terminal
                                                            (i19) No. 6 -- (B94) No. 1:




                                      S6M0109A


        : Is resistance between 10 and 80 ?
        : Go to step 7B2.
        : Replace switch illumination bulb.                                                                        B6M1401A


                                                                 : Is resistance less than 10 ?
7B2 :   CHECK CIRCUIT BETWEEN CRUISE
        CONTROL MODULE AND CRUISE                                : Replace cruise control module. 
        LIGHT.                                                   : Repair or replace wiring harness.

1) Turn the ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Measure voltage between cruise control main
switch connector and the chassis ground.
Connector & terminal
   (i19) No. 1 (+) -- Chassis ground (-):




                                      B6M0528C


        : Is voltage more than 10 V?
        : Go to step 7B3.
        : Repair or replace wiring harness.


                                                    11
6-2a    [T7C0]                            DIAGNOSTICS
7. Diagnostics Chart for Power Line


C: CHECK CRUISE CONTROL MAIN SWITCH
DIAGNOSIS:
Faulty cruise control main switch, or open harness.
WIRING DIAGRAM:




                                                           B6M1400




                                                      12
                                          DIAGNOSTICS                                        [T7C4] 6-2a
                                                                         7. Diagnostics Chart for Power Line


7C1 :   CHECK FUSE.                                      7C3 :   CHECK POWER SUPPLY.

Check fuse No. 18.                                       Measure voltage between fuse & relay box con-
                                                         nector and chassis ground.
                                                         Connector & terminal
                                                            (i5) No. 1 (+) -- Chassis ground (-):




                                      B6M1256A


        : Is fuse No. 18 blown?
        : Replace fuse No. 18. Go to step 7C2.                                                  B6M1258A

        : Go to step 7C2.
                                                                 : Is voltage more than 10 V?
7C2 :   CHECK POWER SUPPLY.                                      : Go to step 7C4.
                                                                 : Replace fuse No. 18. When No. 18 is
1) Turn ignition switch to ON.                                     blown again, repair shorted parts of cir-
2) Measure voltage between fuse & relay box con-                   cuit.
nector and chassis ground.
Connector & terminal                                     7C4 :   CHECK CRUISE CONTROL MAIN
   (B52) No. 5 (+) -- Chassis ground (-):                        SWITCH.

                                                         1) Turn ignition switch to OFF.
                                                         2) Remove cruise control main switch and discon-
                                                         nect connector.
                                                         3) Turn ignition switch to ON.
                                                         4) Measure voltage between cruise control main
                                                         switch connector and chassis ground.
                                                         Connector & terminal
                                                            (i19) No. 3 (+) -- Chassis ground (-):
                                      B6M1257A


        : Is voltage more than 10 V?
        : Go to step 7C3.
        : Replace fuse No. 18. When fuse No. 18
          is blown again, repair shorted parts of
          circuit.


                                                                                                B6M0183D


                                                                 : Is voltage more than 10 V?
                                                                 : Go to step 7C5.
                                                                 : Replace cruise control main switch.
                                                                   


                                                    13
6-2a    [T7C5]                           DIAGNOSTICS
7. Diagnostics Chart for Power Line


7C5 :    CHECK CRUISE CONTROL MAIN                    7C7 :   CHECK HARNESS BETWEEN
         SWITCH.                                              CRUISE CONTROL MAIN SWITCH
                                                              CONNECTOR AND CHASSIS
                                                              GROUND.
Measure resistance between cruise control main
switch terminals.
                                                      1) Connect connector.
Terminals
                                                      2) Turn ignition switch to ON.
    No. 3 -- No. 5:
                                                      3) Turn cruise control main switch to ON.
                                                      4) Measure voltage between terminal of cruise
                                                      control main switch and chassis ground.
                                                      Connector & terminal
                                                         (i19) No. 3 (+) -- Chassis ground (-):




                                      G6M0244


         : Is resistance less than 10 ? (When
           switch is ON.)
         : Go to step 7C6.
                                                                                            B6M0184B
         : Replace cruise control main switch.
                                        : Is voltage more than 10 V?
                                                              : Go to step 7C8.
7C6 :    CHECK CRUISE CONTROL MAIN
         SWITCH.                                              : Repair or replace wiring harness.


Measure resistance between cruise control main        7C8 :   CHECK HARNESS BETWEEN
switch terminals.                                             CRUISE CONTROL MAIN SWITCH
                                                              CONNECTOR AND CHASSIS
Terminals                                                     GROUND.
    No. 3 -- No. 5:
                                                      Measure voltage between terminal of cruise con-
                                                      trol main switch chassis ground.
                                                      Connector & terminal
                                                         (i19) No. 5 (+) -- Chassis ground (-):




                                      G6M0244


         : Is resistance less than 1 M? (When
           switch is OFF.)
         : Go to step 7C7.
                                                                                            B6M0184B
         : Replace cruise control main switch.
                                        : Is voltage more than 10 V?
                                                              : Go to step 7C9.
                                                              : Repair or replace wiring harness.

                                                 14
                                          DIAGNOSTICS                        [T7C9] 6-2a
                                                         7. Diagnostics Chart for Power Line


7C9 :   CHECK HARNESS BETWEEN
        CRUISE CONTROL MODULE CON-
        NECTOR AND CHASSIS GROUND.

Measure voltage between terminal of cruise con-
trol module and chassis ground.
Connector & terminal
   (B94) No. 15 (+) -- Chassis ground (-):




                                      B6M0184B


        : Is voltage more than 10 V?
        : Replace cruise control module. 
        : Repair or replace wiring harness.
NOTE:
Depress cruise control main switch with fingers
while measuring voltage between (i19) No. 5 and
chassis ground.




                                                    15
6-2a    [T7D0]                             DIAGNOSTICS
7. Diagnostics Chart for Power Line


D: BRAKE SWITCH, STOP LIGHT SWITCH, CLUTCH SWITCH (MT),
INHIBITOR SWITCH (AT)
DIAGNOSIS:



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