INSPECTION PROCEDURE 1: Communication between the Scan Tool and the ABS-ECU is not Possible.: Diagnosis

Required Special Tool:

MB991223: Harness Set

STEP 1. Check the power supply circuit at the ABS-ECU connector A-02.
1. Disconnect the ABS-ECU connector A-02 and measure at the harness side.
2. Start the engine.
3. Measure the voltage between terminal 15 and ground.
  
  Fig 1: Measuring Voltage Between Terminal 15 & Ground
  Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Q: Is the voltage approximately 12 volts (battery positive voltage)?
1. YES: Go to Step 3.
2. NO: Go to Step 2.
STEP 2. Check the harness wire between the ignition switch (IG2) and the ABS-ECU connector A-02.
NOTE: After inspecting the intermediate connectors C-94, C-111 and C-112, inspect the wire. If the intermediate connector C-94, C-111, or C-112 is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 5.

Q: Is the harness wire between the ignition switch (IG2) and the ABS-ECU connector A-02 damaged?
1. YES: Repair it and go to Step 5.
2. NO: Go to Step 3.
STEP 3. Check the harness wires between the ABS-ECU connector A-02 and the data link connector C-29.
NOTE: After inspecting the intermediate connectors C-77 and C-94, inspect the wires. If the intermediate connector C-77 or C-94, is damaged, repair or replace it. If the connector has been repaired or replaced, go to Step 5.

Q: Is any of the harness wires between the ABS-ECU connector A-02 and the data link connector C-29 damaged?
1. YES: Repair it and go to Step 5.
2. NO: Go to Step 4.
STEP 4. Check the harness wires between the ABS-ECU connector A-02 and ground.
Q: Is any of the harness wires between the ABS-ECU connector A-02 and ground damaged?
1. YES: Repair it and then go to Step 5.
2. NO: Replace the hydraulic unit (integrated with ABS-ECU) (Refer to HYDRAULIC UNIT ) and then go to Step 5.
STEP 5. Check symptom.
Q: Does the scan tool communicate with the TCL system?
1. YES: This diagnosis is complete.
2. NO: Return to Step 1.