Brand:
Toyota
Model Name:
4Runner GRN210 215 UZN210 215
Manual:
Repair Manual
Section:
1Gr-Fe Engine Control System
Title:
Sfi System
SFI SYSTEM > MIL Circuit
DESCRIPTION
The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detections by the ECM.By turning the ignition switch 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 first turned 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 intelligent tester.
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Troubleshoot each trouble symptom in accordance with the table below.
| MIL remains illuminated | Start inspection from step 1 |
| MIL not illuminated | Start inspection from step 3 |
1.CHECK WHETHER MIL TURNS OFF
Connect the intelligent tester to the DLC3.
Turn the ignition switch on.
Turn the tester on.
Check whether any DTCs have been stored (Click here). Note them down if necessary.
Clear the DTCs (Click here).
Check if the MIL turns off.
- OK:
- MIL should turn off.
| REPAIR CIRCUIT INDICATED BY OUTPUT DTC | |||
| NG | |
 |
2.CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)
Disconnect the E7 ECM connector.
Turn the ignition switch on.
Check that the MIL is not illuminated.
- OK:
- MIL is not illuminated.
Reconnect the ECM connector.
| REPLACE ECM | |||
| NG | |
 | |
| CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM) | |
3.CHECK THAT MIL IS ILLUMINATED
Check if the MIL is illuminated when the ignition switch is turned on.
- OK:
- MIL should be illuminated.
| SYSTEM OK | |||
| NG | |
|
4.INSPECT COMBINATION METER ASSEMBLY (MIL CIRCUIT)
See the combination meter troubleshooting procedure (Click here).
| REPAIR OR REPLACE BULB OR COMBINATION METER ASSEMBLY | |||
| OK | |
| |
| CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM) | |