MIL Circuit [09/2014 - 11/2017]: Procedure
WARNING: This page is about a different car, the 2017 Lexus RC 350, 2017 Lexus RC 300, 2016 Lexus RC 350, 2016 Lexus RC 300, and 2015 Lexus RC 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 Engine switch on (IG) → engine is started A Other than above - B
Result:
A
CHECK FOR INTERMITTENT PROBLEMS. Refer to CHECK FOR INTERMITTENT PROBLEMS [09/2014 - 11/2017]
Result:
B
See step 2
- Perform troubleshooting in accordance with the table below.
- CHECK COMMUNICATION BETWEEN TECHSTREAM AND ECM
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Check the communication between the Techstream and ECM.
HINT:
It can be checked using the "Engine and ECT" 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 [09/2014 - 11/2017]
Result:
A
See step 3
- CHECK WHETHER DTC OUTPUT RECURS
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: System Select / Health Check.
- Check if any DTCs have been detected. Note down any DTCs.
Result
Result Proceed to DTCs are not output A DTCs are 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 TECHSTREAM
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG).
- Turn the Techstream on.
- Enter the following menus: Body Electrical / Combination Meter / Active Test / Check Engine Indicator.
Body Electrical > Combination Meter > Active Test
Tester Display Check Engine Indicator - Check the status of the MIL while performing the Active Test.
Result
Result Proceed to Changes A Does not change B
Result:
A
REPLACE ECM. Refer to REMOVAL [09/2014 - 11/2017]
Result:
B
REPLACE COMBINATION METER ASSEMBLY. Refer to REMOVAL [09/2014 - ]