СИСТЕМА ECD MIL Circuit

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DESCRIPTION

The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction. The instrument panel J/B MET IGN fuse provides circuit power and the ECM provides the circuit ground that illuminates the MIL.

MIL operations should be checked visually:

The MIL should be illuminated when the ignition switch is first turned ON. If the MIL is always on or off, use the intelligent tester and follow the procedures below to determine the cause of the problem.

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INSPECTION PROCEDURE

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PROCEDURE

1. Click here

   CHECK MIL

   
   
   1. 

      Turn the ignition switch ON.

      Result
      MIL Condition Proceed MIL is illuminated A MIL is not illuminated B

   
   
   • AClick here
   • BClick here
2. Click here

   CLEAR DTC

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the ignition switch ON and push the intelligent tester main switch on.

   3. Read the DTC (Click here).

   4. Clear the DTC (Click here).

   5. Check that MIL is not illuminated.

      OK
      MIL is not illuminated.

   
   
   • OKClick here
   • NGClick here
3. Click here

   REPAIR CIRCUIT INDICATED BY OUTPUT DTC

4. Click here

   CHECK WIRE HARNESS (FOR SHORT IN WIRE CIRCUIT)

   
   
   1. 

      Disconnect the B10 ECM connector.

   2. Turn the ignition switch ON.

   3. Check that MIL is not illuminated.

      OK
      MIL is not illuminated.

   
   
   • OKClick here
   • NGClick here
5. Click here

   REPLACE ECM

6. Click here

   CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER)

   
   
   1. 

      Disconnect the B10 ECM connector.

   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for short)
      Tester Connection Specified condition W (B10-5) - Body ground 10 kΩ or higher

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK FOR INTERMITTENT PROBLEMS

8. Click here

   REPAIR OR REPLACE HARNESS OR CONNECTOR

9. Click here

   INSPECT ECM (CHECK VOLTAGE)

   
   
   1. 

      Turn the ignition switch ON.

   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage
      Tester Connection Specified condition W (B10-5) - Body ground 9 to 14 V

   
   
   • OKClick here
   • NGClick here
10. Click here

    REPLACE ECM

11. Click here

    INSPECT COMBINATION METER (CHECK VOLTAGE)

    
    
    1. 

       Disconnect the combination meter connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

       Standard voltage
       Tester Connection Specified condition EGW (H20-32) - Body ground 9 to 14 V

    
    
    • OKClick here
    • NGClick here
12. Click here

    CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER)

    
    
    1. 

       Disconnect the combination meter connector.

    2. Disconnect the B10 ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard resistance (Check for open)
       Tester Connection Specified condition EGW (H20-32) - W (B10-5) Below 1 Ω

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK FOR INTERMITTENT PROBLEMS

14. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

15. Click here

    INSPECT COMBINATION METER (CHECK VOLTAGE)

    
    
    1. 

       Disconnect the combination meter connector.

    2. Turn the ignition switch ON.

    3. Measure the voltage according to the value(s) in the table below.

       Standard voltage
       Tester Connection Specified condition IG+ (H20-6) - Body ground 9 to 14 V

    
    
    • OKClick here
    • NGClick here
16. Click here

    REPLACE COMBINATION METER

17. Click here

    CHECK FUSE (MET IGN FUSE)

    
    
    1. 

       Remove the MET IGN fuse from the instrument panel J/B.

    2. Measure the resistance according to the value(s) in the table below.

       Standard resistance
       Tester Connection Specified Condition MET IGN fuse Below 1 Ω (Continuity)

    
    
    • OKClick here
    • NGClick here
18. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER - MET IGN FUSE)

    
    
    1. 

       Disconnect the combination meter connectors.

    2. Remove the MET IGN fuse from the instrument panel J/B.

    3. Measure the resistance according to the value(s) in the table below.

       Standard resistance (Check for open)
       Tester Connection Specified condition (MET IGN fuse terminal 1 of J/B) - IG+ (H20-6) Below 1 Ω

    
    
    • OKClick here
    • NGClick here
19. Click here

    CHECK AND REPLACE HARNESS AND CONNECTOR (MET IGN FUSE - BATTERY)

20. Click here

    REPLACE FUSE (MET IGN FUSE)

21. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR