Engine. Lexus Gs430, Gs300. Uzs190 Grs190
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CLEAR DTC
CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS)
CHECK THAT MIL IS ILLUMINATED
INSPECT COMBINATION METER (MIL CIRCUIT)
DESCRIPTION
The Malfunction Indicator Lamp (MIL) is used to indicate the ECM's detection of a vehicle malfunction.The instrument panel GAUGE fuse provides the circuit with power and the ECM provides the circuit ground that illuminates the MIL.MIL operations should be checked visually:The MIL should be illuminated when the engine switch is turned on (IG). If the MIL is always ON or OFF, use the intelligent tester and follow the procedures below to determine the cause of the problem.If the ECM detects trouble, the MIL illuminates. At this time, the ECM records a DTC in the memory.
WIRING DIAGRAM
INSPECTION PROCEDURE
- HINT:
- Troubleshoot each problem symptom in accordance with the chart below.
MIL remains on
| Start inspection from step 1
|
MIL is not illuminated
| Start inspection from step 3
|
Connect the intelligent tester to the DLC3.
Turn the engine switch on (IG) and turn the tester ON.
Read the DTC.
Clear the DTC.
Check that the MIL is not illuminated.
- OK:
- MIL is not illuminated.
| | REPAIR CIRCUIT INDICATED BY OUTPUT DTC |
|
|
| 2.CHECK WIRE HARNESS (CHECK FOR SHORT IN WIRE HARNESS) |
Disconnect the A7 ECM connector.
Turn the engine switch on (IG).
Check that the MIL is not illuminated.
- OK:
- MIL is not illuminated.
| NG |
|
|
|
| REPAIR OR REPLACE HARNESS AND CONNECTOR |
|
| 3.CHECK THAT MIL IS ILLUMINATED |
Check that the MIL is illuminated when turning the engine switch on (IG).
- OK:
- MIL is illuminated.
| 4.INSPECT COMBINATION METER (MIL CIRCUIT) |
See the combination meter troubleshooting section (Click here).
| | REPAIR OR REPLACE BULB OR COMBINATION METER |
|
|
| OK |
|
|
|
| CHECK AND REPLACE HARNESS AND CONNECTOR (COMBINATION METER - ECM) |
|
