DESCRIPTION
The Malfunction Indicator Lamp (MIL) 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 turn off after engine is started. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the GTS.
WIRING DIAGRAM
INSPECTION PROCEDURE
After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click hereНажмите здесь).
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
CHECK THAT MIL IS ILLUMINATED
Perform troubleshooting in accordance with the table below.
Result | ||||||
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|
B | Нажмите здесь |
A |
CHECK WHETHER DTC OUTPUT RECURS
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
Check if any DTCs have been detected. Note down any DTCs.
Powertrain > Engine and ECT > Trouble CodesResult | ||||||
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|
Check for detected DTCs output from other ECUs which relate to the MIL.
B |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
A |
CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
Disconnect the A118 ECM connector.
Turn the ignition switch to ON.
Check that the MIL is not illuminated.
OK |
---|
MIL is not illuminated. |
Result | |||
---|---|---|---|
|
OK |
REPLACE ECM Click hereНажмите здесь |
NG |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
Disconnect the combination meter assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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|
Result | |||
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|
OK |
REPLACE COMBINATION METER ASSEMBLY for Sedan: Click hereНажмите здесь REPLACE COMBINATION METER ASSEMBLY for Hatchback, Wagon: Click hereНажмите здесь |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
CHECK THAT MIL IS ILLUMINATED
Check if the MIL illuminated when the ignition switch is turned to ON.
OK |
---|
MIL should be illuminated. |
Result | |||
---|---|---|---|
|
OK |
CHECK FOR INTERMITTENT PROBLEMS Click hereНажмите здесь |
NG |
CHECK THAT ENGINE STARTS
Turn the ignition switch to ON.
Start the engine.
Result | ||||||
---|---|---|---|---|---|---|
|
*: The GTS cannot communicate with the ECM.
B |
GO TO VC OUTPUT CIRCUIT Click hereНажмите здесь |
A |
CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)
Disconnect the combination meter assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
|
Result | |||
---|---|---|---|
|
OK |
REPLACE COMBINATION METER ASSEMBLY for Sedan: Click hereНажмите здесь REPLACE COMBINATION METER ASSEMBLY for Hatchback, Wagon: Click hereНажмите здесь |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |