Inspection Procedure 8: TCL System Does Not Operate

INSPECTION PROCEDURE 8: TCL System 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, 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.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES: Go to Step 2.
NO: Repair the CAN bus line, refer to Diagnosis CAN BUS DIAGNOSTICS TABLE. Scan Tool Testing and Procedures Then go to Step 2.

STEP 2. Recheck for 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. Check again if the DTC is set.

(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is any DTC set?
YES: Diagnose the output DTC, refer to Diagnostic Trouble Code Chart. Then go to Step 3. Diagnostic Trouble Code Descriptions
NO: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.

STEP 3. Using scan tool MB991958, check actuator test.





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) Select "Interactive Diagnosis" from the start-up screen.
(4) Select "System Select".
(5) Choose "ABS/TCL" from the "CHASSIS" tab.
(6) Choose "Actuator Test" from "ABS/TCL" screen.

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

(7) Choose an appropriate item and select the "OK" button.
^ 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.

(8) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are the check results for actuator test item 09 satisfactory?
YES: Go to Step 4.
NO: Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 5.

STEP 4. Retest the system
Q: Does the TCL work normally?
YES: It can be assumed that this malfunction is intermittent. Refer to How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction.
NO: Replace the hydraulic unit (integrated with ABS/TCL-ECU). Then go to Step 5.

STEP 5. Retest the system
Q: Does the TCL work normally?
YES: The procedure is complete.
NO: Return to Step 1.