SFI SYSTEM (w/ Electronic Throttle Control System) MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM. By turning the ignition switch to ON, the power is supplied to the MIL circuit, and the ECM provides the circuit ground that illuminates the MIL.

Operation of the MIL should be checked visually:

When the ignition switch is first turned to ON, the MIL should be illuminated. If it remains OFF or ON, use the intelligent tester II and follow the procedure below to determine cause of the problem.

WIRING DIAGRAM

A0135XQE01

INSPECTION PROCEDURE

Note

After replace the ECM, perform electronic throttle learning Click here.

Tech Tips

Troubleshoot each trouble symptom in accordance with the table below.

Reference
Result Proceed To
MIL remains ON Start inspection from step 1
MIL is not illuminated Start inspection from step 3

PROCEDURE


  1. CHECK MIL CONDITION


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON and turn the intelligent tester ON.

    3. Select the following menu items: Powertrain / Engine and ECT/ DTC.

    4. Check if DTCs have been stored. Note down if there are DTCs.

    5. Select the following menu items: Powertrain / Engine and ECT / DTC / Clear.

    6. Clear DTC.

    7. Check if the MIL goes off.

      OK
      The MIL should go off.

    OK

    CHECK FOR INTERMITTENT PROBLEMS

    NG

  2. CHECK HARNESS AND CONNECTOR (ECM - COMBINATION METER)


    1. A0138OXE01

      Disconnect the B25 ECM connector.

    2. Disconnect the combination meter connector.

    3. Check if the MIL goes off.

      OK
      The MIL should go off.

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.


    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM

  3. CHECK MIL CONDITION


    1. Check if the MIL illuminates when turning the ignition switch to ON.

      OK
      The MIL should be illuminated.

    OK

    END

    NG

  4. CHECK COMBINATION METER ASSEMBLY (MIL CIRCUIT)


    1. Check the MIL circuit Click here


    NG

    REPAIR OR REPLACE COMBINATION METER ASSEMBLY

    OK

    CHECK FOR INTERMITTENT PROBLEMS