INSPECTION PROCEDURE 6: TCL does not Operate: 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. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
2. Turn the ignition switch to the "ON" position.
3. Use scan tool MB991958 to read the TCL diagnostic trouble codes. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
4. Turn the ignition switch to the "LOCK" (OFF) position.
5. Disconnect scan tool MB991958.
  Q: Is any DTC set?
  1. YES: Repair the TCL. (Refer to , DIAGNOSTIC TROUBLE CODE CHART ). Then go to Step 4.
  2. NO: Go to Step 2.
    
    Fig 1: Connecting Special Tool To Data Link Connector
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Using scan tool MB991958, check actuator test item 09: 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. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
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. (Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-III) ).
  - 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?
  1. YES: Go to Step 3.
  2. NO: Replace the hydraulic unit (integrated with TCL/ASC-ECU). (Refer to HYDRAULIC UNIT ). Then go to Step 4.
    
    Fig 2: Connecting Special Tool To Data Link Connector
    Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 3. Retest the system
Q: Does the TCL work normally?
1. YES: It can be assumed that this malfunction is intermittent. (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
2. NO: Replace the hydraulic unit (integrated with TCL/ASC-ECU). (Refer to HYDRAULIC UNIT ). Then go to Step 4.
STEP 4. Retest the system
Q: Does the TCL work normally?
1. YES: The procedure is complete.
2. NO: Return to Step 1.