Mitsubishi Grandis. Manual - part 915

ON-VEHICLE SERVICE

ANTI-SKID BRAKING SYSTEM (ABS)

35B-75

RESISTANCE AND CONTINUITY 
BETWEEN HARNESS-SIDE CONNECTOR 
TERMINALS

1. Turn the ignition switch to the "LOCK" (OFF) 

position and disconnect the ABS-ECU connectors 
before checking resistance and continuity.

2. Check the resistance and continuity between the 

terminals indicated in the table below.

3. The terminal layout is shown in the illustration.

ON-VEHICLE SERVICE

HYDRAULIC UNIT CHECK

M1352001700675

CAUTION

• The roller of the braking force tester and the 

tyre should be dry during testing.

• When testing the front brakes, apply the 

parking brake. When testing the rear brakes, 
stop the front wheels with chocks.

1. Jack up the vehicle. Then support the vehicle with 

rigid racks at the specified jack-up points or place 
the front or rear wheels on the rollers of the 
braking force tester.

2. Release the parking brake, and feel the drag force 

(drag torque) on each road wheel. When using 
the braking force tester, take a reading of the 
brake drag force.

CAUTION

To prevent damage to MUT-III, always turn the 
ignition switch to the "LOOK" (OFF) position 
before connecting or disconnecting the MUT-III.

3.  Turn the ignition switch to the "LOCK" (OFF) 

position and set the MUT-III as shown in the 
illustration.

4. After checking that the shift lever is in neutral, 

start the engine.

AC313001

1

3

4

5

6

7

8

9

10

11

2

13 12

16

17

18

19

20

21

22

23

24

15

25

14

26

ABS-ECU terminal No.

Signal

Normal condition

13 

− body earth

Earth

Less than 2 

Ω

26 

− body earth

Earth

Less than 2 

Ω

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

ON-VEHICLE SERVICE

ANTI-SKID BRAKING SYSTEM (ABS)

35B-76

5. Release the parking brake, and use the MUT-III to 

perform the actuator test with depressing the 
brake pedal. Confirm that the brake drag force 
varies by braking force tester or by rotating the 
wheel with your hand.
NOTE: The ABS system will switch to the MUT-III 
mode and the ABS warning lamp will illuminate.

NOTE: When the ABS has been interrupted by 
the fail-safe function, the MUT-II/III actuator 
testing cannot be used.
NOTE: The ABS warning lamp continues 
illuminating until the communication between 
MUT-III and ABS-ECU is completed.

6. This is indicated as shown above.

7. If the result of inspection is abnormal, repair 

according to the Diagnosis Table below.

8. After inspection, disconnect the MUT-III 

immediately after turning the ignition switch to the 
"LOCK" (OFF) position. 

AC106011

MUT-III actuator test
(No.01, 02, 03, 04) start

Approx. 3 seconds

Pedal operation

Drag force when pedal is free

Lock

Depress

Release

Brake force check

AC

Approx. 0.05 seconds

Diagnosis Table
MUT-III 
Display

Operation

Inspection 
result

Judgm
ent

Probable cause Remedy

01 FR VALVE
02 FL VALVE
03 RR VALVE
04 RL VALVE

• Depress brake pedal 

to lock wheel.

• Using the MUT-II/III, 

select the wheel to be 
checked and force the 
actuator to operate.

• Turn the selected 

wheel manually to 
check the change of 
brake force.

Brake force is 
released for 
three seconds 
after wheels 
have been 
locked.

Normal −

−

Wheel does not 
lock when brake 
pedal is 
depressed.

Abnor
mal

Clogged brake 
line other than 
hydraulic unit

Check and clean 
brake line

Clogged 
hydraulic circuit 
in hydraulic unit

Replace 
hydraulic unit 
assembly

Brake force is 
not released

Incorrect 
hydraulic unit 
brake tube 
connection

Connect correctly

Hydraulic unit 
solenoid valve 
not functioning 
correctly

Replace 
hydraulic unit 
assembly

HYDRAULIC UNIT

ANTI-SKID BRAKING SYSTEM (ABS)

35B-77

IN THE EVENT OF A DISCHARGED 
BATTERY

M1352003500611

WARNING

If the ABS is not operating, the vehicle 
posture will be unstable during braking, Do 
not drive the vehicle with the ABS-ECU 
connector disconnected or with the ABS not 
operating for any other reason.

If the engine is started using a booster cable when 
the battery is completely flat, and the vehicle is then 
driven without waiting for the battery to be recharged, 
the engine may misfire and it may not be possible to 
drive the vehicle. This is because the ABS consumes 
a large amount of current when carrying out its initial 
checks. If this happens, recharge the battery fully.

HYDRAULIC UNIT

REMOVAL AND INSTALLATION

M1352008600550

NOTE: The ABS-ECU is integrated in the hydraulic unit.

HYDRAULIC UNIT

ANTI-SKID BRAKING SYSTEM (ABS)

35B-78

CAUTION

Always calibrate the steering wheel sensor and the G and yaw rate sensor if the hydraulic unit 
(integrated in the TCL/ASC-ECU) is replaced.(Refer to 

P.35C-162

 and 

P.35C-162

) <Vehicles with 

TCL/ASC>

Pre-removal Operation
• Brake Fluid Draining

• Engine cover removal (Refer to GROUP 11A, Camshaft 

and valve stem seal 

P.11A-16

.)

• Air cleaner body assembly removal (Refer to GROUP 15, 

Air Cleaner 

P.15-3

).

• Canister removal (Refer to GROUP 17, Canister 

P.17-64

.) <LH drive vehicles>

Post-installation Operation
• Canister installation (Refer to GROUP 17, canister 

P.17-64

.) <LH drive vehicles>

• Air cleaner body assembly installation (Refer to GROUP 

15, Air Cleaner 

P.15-3

).

• Engine cover installation (Refer to GROUP 11A, 

Camshaft and valve stem seal 

P.11A-16

.)

• Brake Fluid Filling

• Brake Line Bleeding (Refer to GROUP 35A, On-vehicle 

Service 

− Bleeding 

P.35A-6

).

• Hydraulic Unit Check (Refer to 

P.35C-159

).

AC312595

15 ± 2 N·m

2

AB

4

1

5

3

2

2