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Malfunction Indicator Light


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                                 MALFUNCTION INDICATOR LIGHT
                                                                                               ENGINE (DIAGNOSTICS)

15.Malfunction Indicator Light
A: PROCEDURE
1. Activation of check malfunction indicator light. 
                                                                 
2. Check that the malfunction indicator light does not come on. 
                                                                 
3. Check that the malfunction indicator light does not go off. 
                                                                 
4. Check that the malfunction indicator light does not blink at a cycle of 3 Hz. 
                                                                 
5. Check that the malfunction indicator light remains blinking at a cycle of 3 Hz. 




                                                EN(H4DOTC)-47
                                   MALFUNCTION INDICATOR LIGHT
ENGINE (DIAGNOSTICS)

B: ACTIVATION OF MALFUNCTION                               3) If the diagnosis system senses a misfire which
   INDICATOR LIGHT                                         could damage the catalyzer, the malfunction indi-
                                                           cator light will blink at a cycle of 1 Hz.
1) When the ignition switch is turned to ON (engine
off), the malfunction indicator light in the combina-
tion meter illuminates.                                           (1)

NOTE:                                                             (2)
If the malfunction indicator light does not illuminate,
                                                                              (3)
perform diagnostics of the malfunction indicator
light circuit or the combination meter circuit. 
                                                                                                              EN-01680

                                                                  (1)   ON
                                                                  (2)   OFF
                                                                  (3)   Ignition switch ON
                                                                  (4)   Engine start
                                                                  (5)   Misfire start
                                                                  (6)   1 second

                                                           4) When the ignition switch is turned to ON (engine
                          (1)              EN-00157        off) or to START with the test mode connector con-
                                                           nected, the malfunction indicator light blinks at a
       (1) Malfunction indicator light                     cycle of 3 Hz.
2) After starting the engine, the malfunction indica-
tor light goes out. If it does not, either the engine or                (1)
the emission control system is malfunctioning.
                                                                        (2)

       (1)
                 (3)                                                                            (4)

                 (4)
                                                                                    (3)
       (2)
                 (3)

                 (4)                                                                                          EN-01681

                          (5)
                                                                  (1)   ON
                                  (6)                             (2)   OFF
                                           EN-01679
                                                                  (3)   Ignition switch ON
       (1)   No trouble                                           (4)   1 second
       (2)   Trouble occurs
       (3)   ON
       (4)   OFF
       (5)   Ignition switch ON
       (6)   Engine start




                                               EN(H4DOTC)-48
                                                   MALFUNCTION INDICATOR LIGHT
                                                                                                                                     ENGINE (DIAGNOSTICS)

C: MALFUNCTION INDICATOR LIGHT DOES NOT COME ON.
DIAGNOSIS:
The malfunction indicator light circuit is shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), malfunction indicator light does not come on.
WIRING DIAGRAM:
                                                                     IGNITION
                                                                 B72 SWITCH                                                                  BATTERY
                                                   No.14                                          SBF-4       SBF-1
                                                             4                    1




                                             B36
                                      5




                                              i1




                          B9
                          A1



    COMBINATION
    METER
                                              i3
                                       17




    A:   i12                                B38

    B:   i10
                                       17




                                            ECM

                                            B134                                                                                                          E




                   B:     i10                              B72                           A:    i12

     1 2 3 4 5 6 7              8 9 10 11 12 13 14         1 2                         1 2 3        4 5 6
     15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30       3 4                         7 8 9 10 11 12 13 14




                                B36                                              B38                                                  B134

             1 2 3 4 5            6 7 8 9 10 11                    1 2 3 4              5 6 7 8 9                       1     2     3 4 5 6 7
             12 13 14 15 16 17 18 19 20 21 22 23 24                10 11 12 13 14 15 16 17 18 19 20 21                 8 9    10   11 12 13 14 15 16 17
                                                                   22 23 24 25 26 27 28 29 30 31 32                   18 19   20   21 22 23 24 25 26 27
                                                                                                                      28 29   30   31 32          33 34




                                                                                                                                                          EN-02013




                                                                 EN(H4DOTC)-49
                               MALFUNCTION INDICATOR LIGHT
ENGINE (DIAGNOSTICS)

                       Step                                        Check                      Yes                  No
1      CHECK OUTPUT SIGNAL FROM ECM.                  Is the voltage less than 1 V?    Go to step 4.       Go to step 2.
       1) Turn the ignition switch to ON.
       2) Measure the voltage between ECM con-
       nector and chassis ground.
        Connector & terminal
          (B134) No. 17 (+) -- Chassis ground (-):
2      CHECK POOR CONTACT.                            Does the malfunction indicator   Repair the poor     Go to step 3.
                                                      light come on when shaking or    contact in ECM
                                                      pulling ECM connector and        connector.
                                                      harness?
3      CHECK ECM CONNECTOR.                           Is the ECM connector correctly   Replace the ECM.    Repair the con-
                                                      connected?                       
4      CHECK HARNESS BETWEEN COMBINA-            Is the resistance less than 1         Go to step 5.       Repair the har-
       TION METER AND ECM CONNECTOR.             ?                                                         ness and connec-
       1) Turn the ignition switch to OFF.                                                                 tor.
       2) Remove the combination meter.                                                                 In this case, repair
       3) Disconnect the connector from ECM and                                                            the following:
       combination meter.                                                                                  



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