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