Mitsubishi Outlander GS45X. Manual - part 374

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-117

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect DTC may be set. Prior to this diagnosis, diagnose 
the CAN bus lines (Refer to GROUP 54C 

− CAN Bus 

Line Diagnostic Flow 

P.54C-10

).

• Whenever ECU is replaced, ensure that the CAN bus 

lines are normal.

.

OPERATION

• ABS-ECU contains the power supply circuit (terminal 

No.13) for the pump motor. The pump motor is energized by 
the motor switch, which is incorporated in ABS-ECU.

• The pump motor switch, which is incorporated in ABS-ECU, 

is always off unless the motor solenoid valve check is acti-
vated when the vehicle is started.

• ABS-ECU activates the pump motor by turning on the ECU 

built-in pump motor switch.

.

DTC SET CONDITIONS

This DTCs will be set under the cases below:

• When the power supply voltage of the pump motor, which is 

not in operation, is abnormally low for a prolonged period

• When the power supply voltage of the pump motor, which is 

not in operation, is abnormally high for a prolonged period

.

PROBABLE CAUSES

Current trouble

• Fusible link malfunction

• Damaged wiring harness and connectors

• Abnormality in battery or generator

• ABS-ECU malfunction

Past trouble

• Carry out diagnosis with particular emphasis on wiring har-

ness and connector failures between the power supply cir-
cuit (A-01 ABS-ECU connector terminal No.13) to the 
ABS-ECU motor and the ground circuit (A-01 ABS-ECU 
connector terminal No.1). For diagnosis procedures, refer to 
How to treat past trouble (GROUP 00 

− How to Use Trou-

bleshooting/How to Treat Past Trouble 

P.00-17

).

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

• MB991974: ABS check harness

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-118

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.
Use scan tool MB991958 to diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Repair the CAN bus lines (Refer to GROUP 54C 

− 

CAN Bus Diagnostics Table 

P.54C-17

). On 

completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is the DTC C2116 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Battery check
Refer to GROUP 54A 

− Battery Test 

P.54A-9

.

Q: Is the battery in good condition?

YES : Go to Step 4.
NO :  Replace the battery. Then go to Step 11.

STEP 4. Charging system check
Refer to GROUP 16 

− On−vehicle Service/Output Current Test 

P.16-9

 (3.0L engine).

Q: Is the charging system in good condition?

YES : Go to Step 5.
NO :  Repair or replace the charging system component(s). 

Then go to Step 11.

STEP 5. Connector check: A-01 ABS-ECU connector
Q: Is the check result normal?

YES : Go to Step 6.
NO  :  Repair the defective connector. Then go to Step 11.

STEP 6. Fusible link check: Check the fusible link No.26.
Visually check for open circuit in the fusible link No.26.
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Go to Step 7.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-119

STEP 7. 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) Disconnect the fusible link No.26.
(3) Measure the resistance between the terminal No.13 and the 

body ground.

OK: No continuity

Q: Is the check result normal?

YES : Replace the fusible link No.26. Then go to Step 11.
NO :  The short circuit may be present in the power supply 

circuit. Repair the wiring harness between the A-08 
ABS-ECU connector terminal No.13 and the fusible 
link No.26, and then replace the fusible link No.26. 
Then go to Step 11.

STEP 8. Voltage measurement at the 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 voltage between the terminal No.13 and the 

body ground.

OK: Approximately system voltage

Q: Is the check result normal?

YES : Go to Step 9.
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.13 and the fusible 
link No.26. Then go to Step 11.

AC606869 HL

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

AC606869AO

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-120

STEP 9. 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 10.
NO :  An open circuit may be present in the ground circuit. 

Repair the wiring harness between the A-01 
ABS-ECU connector terminal No.1 and the body 
ground, and between the A-01 ABS-ECU connector 
terminal No.14 and the body ground. Then go to Step 
11.

STEP 10. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is the DTC C2116 set?

YES : Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

). Then go to Step 11.

NO :  Intermittent malfunction (Refer to GROUP 00 

− How 

to Use Troubleshooting/How to Cope with Intermittent 
Malfunctions 

P.00-15

).

STEP 11. Check whether the DTC is reset.
(1) Erase the DTC.
(2) Drive the vehicle at 12mph (20 km/h) or higher.

NOTE: The ABS warning light does not turn OFF in some 
cases unless the vehicle runs at 12mph (20 km/h) or higher.

Q: Is the DTC C2116 set?

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

AC606869AP

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector