MIL Circuit [10/2022 - ]: Procedure
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.
- CHECK THAT MIL IS ILLUMINATED
- Perform troubleshooting in accordance with the table below.
Result
MIL Condition Proceed to Illuminates → Turns off Ignition switch ON → engine is started A Other than above - B
Result:
A
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [10/2022 - ]
Result:
B
See step 2
- Perform troubleshooting in accordance with the table below.
- CHECK COMMUNICATION BETWEEN GTS AND ECM
- Check the communication between the GTS and ECM.
HINT:
It can be checked using the "Engine" item of the Data List.
Result
Result Proceed to Communication is possible A Communication is not possible B
Result:
B
GO TO VC OUTPUT CIRCUIT. Refer to VC Output Circuit [10/2022 - ]
Result:
A
See step 3
- Check the communication between the GTS and ECM.
- CHECK WHETHER DTC OUTPUT RECURS
- Perform the Health Check using the GTS.
- Check if any DTCs have been detected. Note down any DTCs.
Result
Result Proceed to DTCs are not output A Any DTCs is output B HINT:
Check for detected DTCs output from other ECUs which relate to the MIL.
Result:
B
REPAIR CIRCUIT INDICATED BY OUTPUT
Result:
A
See step 4
- PERFORM ACTIVE TEST USING GTS
- Check the status of the MIL while performing the Active Test.
Body Electrical > Combination Meter > Active Test
Tester Display Check Engine Warning Result
Result Proceed to Changes A Does not change B
Result:
A
REPLACE ECM. Refer to REMOVAL [10/2022 - ]
Result:
B
REPLACE COMBINATION METER ASSEMBLY. Refer to REMOVAL [10/2022 - 10/2024] , or refer to REMOVAL [10/2024 - ]
- Check the status of the MIL while performing the Active Test.