SFI SYSTEM MIL Circuit

DTC Code DTC Name
MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to ON, power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually: When the ignition switch is turned to ON, the MIL should be illuminated and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.

WIRING DIAGRAM

A147879E23

CAUTION / NOTICE / HINT

Note:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

  1. CHECK THAT MIL IS ILLUMINATED

    1. Turn the ignition switch to ON.

    2. Check the illumination of the MIL.

      Table 1. Result

      Condition

      Proceed to

      MIL remains illuminated (Even after ignition switch turned to ON and several seconds have passed, MIL still remains illuminated)

      A

      MIL remains off (Does not illuminate at all)

      B

      MIL illuminates for several seconds, but turns off after engine is started

      C

    CHECK THAT ENGINE STARTSClick here

    SYSTEM OK

  2. CHECK WHETHER MIL TURNS OFF

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Check if any DTCs have been stored. Note down any DTCs.

    6. Clear the DTCs (Click here).

    7. Check if the MIL goes off.

      OK

      MIL goes off.

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS

    (Click here)

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)

    1. U123362E02

      Disconnect the ECM connector.

    2. Turn the ignition switch to ON.

    3. Check that the MIL is not illuminated.

      OK

      MIL is not illuminated.

      Table 2. Text in Illustration

      *a

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.

    REPLACE ECM

    (Click here)

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

    1. Disconnect the combination meter connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      H62-29 (EFI) or A76-27 (W) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the combination meter connector.

    5. Reconnect the ECM connector.

    CHECK COMBINATION METER

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM)

  5. CHECK THAT ENGINE STARTS

    1. Turn the ignition switch to ON.

    2. Start the engine.

      Table 3. Result

      Result

      Proceed to

      Engine starts

      A

      Engine does not start*

      B
      Tip:

      *: The GTS cannot communicate with the ECM.

    GO TO VC OUTPUT CIRCUIT

    (Click here)

  6. CHECK ECM (TERMINAL VOLTAGE)

    1. U123363E01

      Disconnect the ECM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A76-27 (W) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 4. Text in Illustration

      *a

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.

    REPLACE ECM

    (Click here)

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

    1. Disconnect the combination meter connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      H62-29 (EFI) - A76-27 (W)

      Always

      Below 1 Ω

    4. Reconnect the ECM connector.

    5. Reconnect the combination meter connector.

    CHECK COMBINATION METER

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR (COMBINATION METER - ECM)