Required Special Tools:

MB991223: Harness set
MB991958: Scan tool (MUT-III sub assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB cable
- MB991910: MUT-III main harness A
MB991970: ABS check harness
MB991952: ABS check harness

STEP 1. Measure the terminal voltage at ABS/TCL-ECU connector A-02 < FWD > or TCL/ASC-ECU connector A-32 < AWD >.
1. Disconnect all the connectors from the ABS/TCL-ECU < FWD > or TCL/ASC-ECU < AWD >.
  
  Fig 1: Identifying Connectors
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
2. Vehicles for FWD, connect special tool MB991970 between the ABS/TCL-ECU and the body-side harness connector.
  
  Fig 2: connecting Special Tool MB991970 Between ABS/TCL-ECU And Body-Side Harness Connector
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
3. Vehicles for AWD, connect special tool MB991970 between the TCL/ASC-ECU and the body-side harness connector.
4. Turn the ignition switch to the "ON" position.
5. Vehicles for FWD, measure the terminal voltage between special tool MB991970 connector terminal 6 (ABS/TCL-ECU connector A-02 terminal 6) and ground.
  - When the TCL switch is not pressed, the voltage should measure battery positive voltage (approximately 12 volts).
  - When the TCL switch is pressed, the voltage should measure 1 volt or less.
6. Vehicles for AWD, measure the terminal voltage between special tool MB991952 connector terminal 15 (TCL/ASC-ECU connector A-32 terminal 15) and ground.
  - When the TCL switch is not pressed, the voltage should measure battery positive voltage (approximately 12 volts).
  - When the TCL switch is pressed, the voltage should measure 1 volt or less.
7. Turn the ignition switch to the "LOCK" (OFF) position.
8. Vehicles for FWD, disconnect special tool MB991970 between the ABS/TCL-ECU and the body-side harness connector.
9. Vehicles for AWD, disconnect special tool MB991952 between the TCL/ASC-ECU and the body-side harness connector.
10. Connect all the connectors from the ABS/TCL-ECU < FWD > or TCL/ASC-ECU < AWD >.
Q: Is the terminal voltage battery terminal voltage when the TCL switch is not pressed, and is the terminal voltage 1 volt or less when the TCL switch is pressed?

YES: Go to Step 6.

NO: Go to Step 2.

Fig 3: Identifying Special Tool 34 Pin Connector
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 2. Check the TCL switch.
1. Remove the TCL switch. (Refer to TCL SWITCH ).
2. Connect an ohmmeter to the TCL switch between terminals 1 and 2.
3. Check for continuity between terminals 1 and 2 when the TCL switch is operated.
  - There is no continuity between terminals 1 and 2 when the TCL switch is not pressed.
  - There is continuity between terminals 1 and 2 when the TCL switch is pressed.
Q: Is there no continuity between terminals 1 and 2 when the TCL switch is not pressed, and is there continuity when the TCL switch is pressed?

YES: Install the TCL switch. (Refer to TCL SWITCH ). Then go to Step 6.

NO: Replace the TCL switch. (Refer to TCL SWITCH ). Then go to Step 7.

Fig 4: Connecting An Ohmmeter To TCL Switch Between Terminals
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 3. Check ABS/TCL-ECU connector A-02 < FWD > or TCL/ASC-ECU connector A-32 < 4AWD >, intermediate connector C-31 and TCL switch connectors C-35 for loose, corroded or damaged terminals, or terminals pushed back in the connector.
Q: Are there connectors and terminals in good condition?

YES: Go to Step 4.

NO: Repair or replace the faulty connector. (Refer to ). Then go to Step 7.

Fig 5: Identifying Connectors A-02 Or A-32
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 6: Identifying Connectors C-31 Or C-35
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 4. Check the harness wire between ABS/TCL-ECU connector A-02 terminal 6 < FWD > or TCL/ASC-ECU connector A-32 terminal 15 < AWD > and TCL switch connector C-35 terminal 1 for damage.
Q: Are there harness wires in good condition?

YES: Go to Step 5.

NO: Repair the damaged harness wire. Then go to Step 7.

Fig 7: Identifying Connectors A-02 Or A-32
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 8: Identifying Connectors C-35
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 5. Check the harness wire between TCL switch connector C-35 terminal 2 and ground for damage.
Q: Is the harness wire in good condition?

YES: Go to Step 6.

NO: Repair the damaged harness wire. Then go to Step 7.

Fig 9: Checking Harness Wire Between TCL Switch Connector C-35 Terminal 2 And Ground For Damage
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 10: Identifying A/T Selector Lever
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
STEP 6. Retest the system
Q: Is TCL system cancelled when the TCL switch is push on?

YES: It can be assumed that this malfunction is intermittent. (Refer to ).

NO: Replace the hydraulic unit (integrated with ABS/TCL-ECU < FWD > or TCL/ASC-ECU < AWD >). (Refer to HYDRAULIC UNIT ). Then go to Step 7.
STEP 7. Retest the system
Q: Does TCL system cancelled, when the TCL switch is push on?

YES: The procedure is complete.

NO: Return to Step 1.