Mitsubishi Galant. Manual - part 523

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-25

STEP 3. Check the harness wire between ABS-ECU 
connector A-03 and data link connector C-23.
NOTE: After inspecting intermediate connector C-12 or C-57, 
inspect the wire. If intermediate connector C-12 or C-57 is 
damaged, repair or replace it. Refer to GROUP 00E, Harness 
Connector Inspection 

P.00E-2

. If the connector has been 

repaired or replaced, go to Step 4.

Q: Is any harness wire between ABS-ECU connector A-03 

and data link connector C-23 damaged?
YES : Repair them and go to Step 5.
NO :  Go to Step 4.

AC003695 AB

CONNECTOR: A-03

AC003089 AB

CONNECTOR: C-23

AC003131 AB

CONNECTOR: C-12

AC003089AE

CONNECTOR: C-57

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-26

STEP 4. Check the harness wires between ABS-ECU 
connector A-03 and ground.
Q: Are any harness wires between ABS-ECU connector A-

03 and ground damaged?
YES : Repair them and then go to Step 5.
NO :  Go to Step 5.

STEP 5. Check symptoms

Q: Does the scan tool communicate with the ABS system?

YES : This diagnosis is complete.
NO :  Return to Step 1.

AC003695 AB

CONNECTOR: A-03

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-27

INSPECTION PROCEDURE 2: When the ignition switch is turned "ON" (engine stopped), the ABS 
warning light does not illuminate.

AC003925AB

ABS Warning Light Power Supply and Ground Circuit

ANTI-SKID BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM(ABS)

35B-28

CIRCUIT OPERATION
The ABS warning light power is supplied from the 
ignition switch.

TECHNICAL DESCRIPTION (COMMENT)
The cause may be: an open circuit in the ABS 
warning light power supply circuit, a blown ABS 
warning light bulb or ABS warning light relay.

TROUBLESHOOTING HINTS (The most likely 
causes for this condition:)

•

Blown fuse

•

Damaged wring harness or connector

•

Burnt out ABS warning light bulb

•

Malfunction of the ABS warning light relay

DIAGNOSIS

Required Special Tool:

•

MB991223: Harness Set

STEP 1. Check the ABS warning light relay continuity.
(1) Remove the ABS warning light relay.
(2) Check the continuity between terminal number 1 and 

number 3 and between terminal number 5 and number 2 at 
the ABS warning light relay.

Q: Is the ABS warning light relay continuity?

YES : Go to Step 2.
NO :  Replace the ABS warning light and then go to Step 7.

AC003923 AB

CONNECTOR: A-10X

RELAY BOX IN

ENGINE 

COMPARTMENT

AC003870 AB

CONNECTOR: C-66

CONNECTOR
BLOCK (LH)

AC003922AB

CONNECTORS: C-29, C-30

C-30

C-29

AC003082 AM

CONNECTORS: C-73, C-78

C-73

C-78

JUNCTION BLOCK
(FRONT VIEW)

AC003921