Mitsubishi Outlander GS45X. Manual - part 389

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-177

STEP 4. Wheel alignment check
At the same time with the following checks, also check that no 
parts other than the genuine parts are mounted.

• Front wheel alignment check (Refer to GROUP 33 − 

On-vehicle Service/Front Wheel Alignment Check and 
Adjustment 

P.33-8

.)

• Rear wheel alignment check (Refer to GROUP 34 − 

On-vehicle Service/Rear Wheel Alignment Check and 
Adjustment 

P.34-10

.)

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair or replace the part(s) having damage or other 

problems. Then go to Step 9.

STEP 5. Scan tool data list
Check the following data list (Refer to 

P.35B-179

).

• Item No. 01: FL wheel speed sensor

• Item No.02: FR wheel speed sensor

• Item No.03: RL wheel speed sensor

• Item No.04: RR wheel speed sensor

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Go to Step 6.

STEP 6. Wheel speed sensor check
Check that no non-genuine electronic device or no wiring har-
ness of other than genuine electronic device is mounted near 
the wheel speed sensor (at wheel speed detection section and 
wiring harness section) (Refer to 

P.35B-189

).

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Remove the non-genuine electronic device or the 

wiring harness of non-genuine electronic device. 
Then go to Step 9.

STEP 7. Hydraulic unit check
Carry out the following actuator tests, and check if they work 
normally (Refer to 

P.35B-179

).

• Item No. 01: FL wheel ABS

• Item No.02: FR wheel ABS

• Item No.03: RL wheel ABS

• Item No.04: RR wheel ABS

Q: Is the check result normal?

YES : Go to Step 8.
NO :  Replace the hydraulic unit (integrated with ABS-ECU) 

(Refer to 

P.35B-188

). Then go to Step 9.

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-178

STEP 8. ABS operation check
Q: Is the check result normal?

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 9.

STEP 9. ABS operation check
Q: Is the check result normal?

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

Inspection Procedure 10: The initial check sound of hydraulic unit is loud.

CAUTION

When installing brake tube, match the axial center of flare 
nut and brake tube with the center of hole at the hydraulic 
unit side, and check that the fluid does not leak.

.

COMMENT ON TROUBLE SYMPTOM

The operation sound may be decreased by reducing the load at 
the rubber mount portion of the brake tube and hydraulic unit. 

.

PROBABLE CAUSES

• Improper installation of the hydraulic unit

• Improper installation of the brake tube

DIAGNOSIS

DRIVING CHECK
(1) Turn the ignition switch from the "LOCK" (OFF) position to 

the "ON" position.

(2) When vehicle speed reaches 6 mph (10 km/h), check the 

operating sound volume and compare it with that of the 
same model.

OK: The operating sound is the same volume or 
less by comparing with that of the same model.

Q: Is the check result normal?

YES : This diagnosis is complete.
NO :  Carry out adjustment for hydraulic unit installation. 

(Refer to 

P.35B-184

).

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-179

DATA LIST REFERENCE TABLE

M1352011501385

The following items can be read by the scan tool 
from the ABS-ECU input data.

The following items of ECU input data can be read 
using scan tool.

1. The system is normal.

2. System shutdown by ECU

 

While ABS-ECU is disabled by the diagnostic 
function, the scan tool displayed data is different 
from the actual measurement.

ACTUATOR TEST REFERENCE TABLE

M1352011601100

Using scan tool, the following actuators can be forc-
ibly operated:
NOTE: 

.

•

ABS is operated by ABS-ECU.

•

When ABS-ECU is disabled due to the fail-safe 
function, the actuator test cannot be performed.

•

The actuator test can be performed only when 
the vehicle is stationary.

•

While the actuator test is performed, the ABS 
warning light flashes at a rate of 2 Hz.

•

After the actuator test has been performed, the 
brake warning light and ABS warning light illumi-
nate until the ignition switch is turned to ON again 
or the communication between scan tool and 
ABS-ECU is terminated.

.

Actuator test specifications

.

Item No.

Check item

Check conditions

Normal conditions

01

FL wheel speed sensor

Perform a test run of the vehicle. The speedometer display and 

the scan tool display almost 
agree with each other. 
<During stop: approximately 
0.4 mph (0.7km/h)>

02

FR wheel speed sensor

03

RL wheel speed sensor

04

RR wheel speed sensor

05

Power supply voltage

Battery positive voltage (10 to 
18 V ABS operatable range)

07

Brake switch (input)

The brake pedal is released.

OFF

The brake pedal is depressed.

ON

14

Brake switch (Stop light 
switch)

The brake pedal is depressed.

ON

The brake pedal is released.

OFF

87

Ignition switch (input)

Ignition switch is "ON" position

ON

88

Vehicle speed

Perform a test run of the vehicle. The speedometer display and 

the scan tool display almost 
agree with each other.

105

Power supply voltage (input)

Battery positive voltage (10 to 
18 V ABS operatable range)

Item No.

Check item

Driven component

01

FR wheel ABS drive

Solenoid valve for the corresponding 
wheel of the hydraulic unit and pump 
motor (simplified inspection mode)

02

FL wheel ABS drive

03

RR wheel ABS drive

04

RL wheel ABS drive

ABS DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-180

Operation pattern of items 01 to 04 

CHECK AT ECU TERMINALS

M1352011801427

.

TERMINAL VOLTAGE CHECK

Required Special Tool:
MB991974: ABS Check Harness
Connect the special tool ABS check harness (MB991974) to 
measure the voltage between each check connector terminal 
and the ground terminal (No.1 or 14).

AC608796

1second

2 seconds

End

Increase in pressure

Steady pressure

Reduction in pressure

Drive

Stop

Solenoid valve

Pump motor

M.U.T.-III actuator test 
(Item No. 01, 02, 03, 04) start

Approximately
0.05 second

Approximately
0.01 second

AB

AC611138 AJ

ABS-ECU

MB991974

A-01 ABS-ECU  
harness connector

Check harness