Mitsubishi Outlander GS45X. Manual - part 388

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-173

STEP 21. Measure the voltage at the C-317 ETACS-ECU 
connector.
(1) Measure at ETACS-ECU side connector.

NOTE: Do not disconnect the connector.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.5 and the body 

ground by backprobing.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 23.
NO :  Go to Step 22.

STEP 22. Check the harness wire between A-01 ABS-ECU 
connector terminal No.7 and C-317 ETACS-ECU connector 
terminal No.5.

• Check the harness wire for short circuit.

NOTE: Prior to the wiring harness inspection, check intermedi-
ate connector C-33, and repair if necessary.
Q: Is the check result normal?

YES : Replace the ETACS-ECU (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-825

), and then go to Step 27.

NO :  Repair the wiring harness, and then go to Step 27.

STEP 23. Connector check: C-33 intermediate connector
Q: Is the check result normal?

YES : Go to Step 24.
NO  :  Repair the damaged connector.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-174

STEP 24. Voltage measurement at A-01 ABS-ECU 
connector
(1) Disconnect the ABS-ECU connector, connect special tool 

ABS check harness (MB991974) to the harness-side 
connector, and then measure the resistance at the special 
tool connector side.
NOTE: Do not connect the special tool ABS check harness 
(MB991974) to ABS-ECU.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No.7 and body 

ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 25.
NO :  The open circuit may be present in the power supply 

circuit. Repair the wiring harness between the A-01 
ABS-ECU connector terminal No.7 and the C-317 
ETACS-ECU connector terminal No.5. Then go to 
Step 27.

STEP 25. Resistance measurement at A-01 ABS-ECU 
connector
(1) Disconnect the ABS-ECU connector, connect special tool 

ABS check harness (MB991974) to the harness-side 
connector, and then measure the resistance at the special 
tool connector side.
NOTE: Do not connect the special tool ABS check harness 
(MB991974) to ABS-ECU.

(2) Measure the resistance between the terminal No.1 and the 

body ground, and between the terminal No.14 and the body 
ground

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : Go to Step 26.
NO :  An open circuit may be present in the ground circuit. 

Repair the wiring harness between the A-01 
ASC-ECU connector terminal No.1 and the body 
ground, and between the A-01 ASC-ECU connector 
terminal No.14 and the body ground. Then go to Step 
27.

AC606869HP

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

AC606869AP

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-175

STEP 26. Retest the system.
Make sure that the M.U.T.-III cable is properly connected and 
the V.C.I. switch is ON,
Q: Is the communication with scan tool possible?

YES : Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

). Then go to Step 27.

STEP 27. Retest the system.
Q: Is the communication with scan tool possible?

YES : Return to Step 1.
NO :  The procedure is complete.

Inspection Procedure 9: ABS operates too frequently.

CAUTION

If there is any problem in the CAN bus lines, an incorrect 
diagnostic trouble code may be set. Prior to this diagno-
sis, diagnose the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Line Diagnostic Flow 

P.54C-10

).

.

COMMENTS ON TROUBLE SYMPTOM

• Although the cause of the trouble cannot be clearly 

resolved since it depends on the running status and road 
surface condition, the malfunction of the hydraulic circuit 
may occur if any DTC is not detected.

• If wheels and tires other than the ones with genuine speci-

fied size are mounted, the ABS may be activated prema-
turely.

• If a non-genuine braking device or non-genuine impact 

reduction device is mounted, the ABS may be activated 
prematurely.

.

PROBABLE CAUSES

• Mounting of wheels and tires other than with genuine speci-

fied size

• Tire pressure abnormality

• Tire wear and deterioration

• Mounting of non-genuine braking device or impact reduc-

tion device

• Wheel alignment abnormality

• Malfunction of brake related parts

• ABS-ECU malfunction

• Malfunction of hydraulic circuit

• External radio wave noise interference

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-176

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

STEP 1. Check the wheels and the tires.
Carry out the following check.

• Size check of wheels and tires

• Tire wear and deterioration statuses

• Check the tire pressure.

NOTE: For the tire pressure, refer to the tire pressure label 
attached to the lower section of driver's side door striker.

Q: Is the check result normal?

YES : Go to Step 2.
NO :  Correct the wheels and tires in good condition. Then 

go to Step 9.

STEP 2. DTC check
Use scan tool MB991958 to check the DTC for the ABS system 
(Refer to 

P.35B-15

).

Q: Is the check result normal?

YES : Go to Step 3.
NO :  Carry out the diagnosis for the DTC (Refer to 

P.35B-15

). Then go to Step 9.

STEP 3. Check of brake system related components other 
than hydraulic unit (integrated with ABS-ECU)
At the same time with the following checks, also check that no 
parts other than the genuine parts are mounted.

• Brake pad check (Refer to GROUP 35A − On-vehicle Ser-

vice/Brake Pad Check 

P.35A-21

.)

• Brake disk run-out check (Refer to GROUP 35A − On-vehi-

cle Service/Brake Disk Check 

P.35A-24

.)

• Brake drag force check (Refer to GROUP 35A − On-vehicle 

Service/Brake Drag Force Check 

P.35A-27

)

Q: Is the check result normal?

YES : Go to Step 4.
NO :  Repair or replace the part(s) having damage or other 

problems. Then go to Step 9.