SFI SYSTEM > MIL Circuit |
for Preparation Click here
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunctions detected by the ECM. When the ignition switch is turned to the ON position, 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 first turned to the ON position, 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 intelligent tester.
WIRING DIAGRAM
INSPECTION PROCEDURE
1.CHECK THAT MIL IS ILLUMINATED |
Perform troubleshooting in accordance with the table below.
- Result:
Condition Proceed to MIL remains ON A MIL does not illuminate B
|
| ||||
A | |
2.CHECK WHETHER MIL TURNS OFF |
Connect the intelligent tester to the DLC3.
Turn the ignition switch to the ON position and turn the tester ON.
Select the following menu items: Powertrain / Engine / DTC.
Check if any DTCs have been stored. Note down any DTCs.
Clear the DTCs (Click here).
Check if the MIL goes off.
- Standard:
- MIL goes off.
|
| ||||
NG | |
3.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) |
Disconnect the A24 (RHD) or A55 (LHD) ECM connector.
Turn the ignition switch to the ON position.
Check that the MIL is not illuminated.
- OK:
- MIL is not illuminated.
Reconnect the ECM connector.
|
| ||||
NG | |
4.CHECK HARNESS AND CONNECTOR (COMBINATION METER - ECM) |
Disconnect the A24 (RHD) or A55 (LHD) ECM connector.
Disconnect the F2 combination meter connector.
Measure the resistance.
- Standard resistance (Check for short):
- RHD:
Tester Connection Specified Condition W (A24-24) or CHK (F2-4) - Body ground 10 kΩ or higher - LHD:
Tester Connection Specified Condition W (A55-24) or CHK (F2-4) - Body ground 10 kΩ or higher
Reconnect the ECM connector.
Reconnect the combination meter connector.
|
| ||||
NG | ||
|
5.CHECK THAT MIL IS ILLUMINATED |
Check if the MIL is illuminated when the ignition switch is turned to the ON position.
- OK:
- MIL is illuminated.
|
| ||||
NG | |
6.CHECK THAT ENGINE STARTS |
Turn the ignition switch to the ON position.
Start the engine.
- Result:
Result Proceed to Engine starts A Engine does not start* B
- HINT:
- *: The intelligent tester cannot communicate with the ECM.
|
| ||||
A | |
7.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT) |
Check the MIL circuit (Click here).
|
| ||||
OK | ||
|