Inspection Procedure 4

INSPECTION PROCEDURE 4: The TCL Work Indicator Light Remains Illuminated After the Engine is Started.

Part 1:

Part 2:

CIRCUIT OPERATION
- ABS/TCL-ECU send the illumination signal of "TCL OFF" indicator light and TCL work indicator light to the combination meter via the CAN communication.
- ABS/TCL-ECU operates the "TCL OFF" indicator light and the TCL work indicator light for three seconds after the ignition switch is turned "ON" position for bulb check.

COMMENT
This may be caused by faults in the CAN bus line, the combination meter or the ABS/TCL-ECU.

TROUBLESHOOTING HINTS
- Malfunction of the combination meter.
- Damaged harness or connector.
- Malfunction of the ABS/TCL-ECU.

DIAGNOSIS

Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: M.U.T.-III USB Cable
- MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus line.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Testing and Procedures
2. Turn the ignition switch to the "ON" position.
3. Diagnose the CAN bus line. How to Diagnose the CAN Bus Lines
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is the check result satisfactory?

YES : Go to Step 2

NO : Repair the CAN bus lines. (Refer to CAN, Diagnosis - Can Bus Diagnostic Chart). Then go to Step 4.

STEP 2. Using scan tool MB991958, read the diagnostic trouble code.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Testing and Procedures
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. Diagnostic Trouble Code Descriptions
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES : Refer to Diagnostic Trouble Code Chart. Diagnostic Trouble Code Descriptions Then go to Step 4.

NO : Go to Step 3.

STEP 3. Using scan tool MB991958, read the diagnostic trouble code.






CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector. Scan Tool Connecting
2. Turn the ignition switch to the "ON" position.
3. Check for Combination meter system diagnostic trouble code. (Refer to Chassis Electrical, Combination Meter Assembly Diagnosis-Diagnosis Function - How to Read and Erase Diagnostic Trouble Code).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is DTC U1102 set?

YES : Replace the hydraulic unit (integrated with ABS/TCL-ECU). (Refer to ABS - Hydraulic Unit). Then go to Step 4.

NO : Replace the combination meter assembly. (Refer to Chassis Electrical - Combination Meter Assembly). Then go to Step 4.

STEP 4. Retest the system

Q: Turn the ignition switch to the "ON" position. Do the "TCL OFF" indicator light and the TCL work indicator light illuminate for three seconds, and then go out after the engine starts?

YES : The procedure is complete.

NO : Return to Step 1.