Inspection Procedure 6

INSPECTION PROCEDURE 6: TCL does not Operate.

COMMENT
The fail-safe function is probably canceling TCL. In this case, scan tool MB991958 can be used to retest each system by checking the diagnostic trouble codes.

TROUBLESHOOTING HINTS (THE MOST LIKELY CAUSES FOR THIS CASE:)
- Malfunction of the CAN bus line.
- Malfunction of the MFI system.
- Malfunction of the A/T system.
- 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, 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.
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to read the TCL diagnostic trouble codes.
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Is any DTC set?

YES: Repair the TCL. (Refer to Diagnostic Trouble Code Chart). Then go to Step 4. Diagnostic Trouble Code Descriptions

NO: Go to Step 2.




STEP 2. Using scan tool MB991958, check actuator test item09: Engine TCL Drive.

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.
2. Turn the ignition switch to the "ON" position.

CAUTION: The engine speed increases after the actuator test because the actuator test continues for only three seconds. Therefore, release the accelerator pedal immediately.

3. Use scan tool MB991958 to check the actuator test. Scan Tool Testing and Procedures
- Item 09: Engine TCL Drive.
- When the accelerator pedal is depressed at the same time that the button for actuator test item 09 displayed on scan tool MB991958 is pressed, the system prevents the engine speed from rising for three seconds.

4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.

Q: Are the check results for actuator test item 09 satisfactory?

YES: Go to Step 3.

NO: Replace the hydraulic unit (integrated with ABS/TCL-ECU). (Refer to Hydraulic Unit). Then go to Step 4.

STEP 3. Retest the system

Q: Does the TCL work normally?

YES: It can be assumed that this malfunction is intermittent.

NO: Replace the hydraulic unit(integrated with ABS/TCL-ECU).(Refer to Hydraulic Unit). Then go to Step 4.

STEP 4. Retest the system

Q: Does the TCL work normally?

YES: The procedure is complete.

NO: Return to Step 1.