Mitsubishi Colt Ralliart. Manual — part 246

ON-VEHICLE SERVICE

ANTI-SKID BRAKING SYSTEM (ABS)

35B-76

ON-VEHICLE SERVICE

HYDRAULIC UNIT CHECK

M1352001700705

1. Raise the vehicle, and support the specified area

on axle stands.

CAUTION

Before connecting or disconnecting the
M.U.T.-III, turn the ignition switch to the "LOCK"
(OFF) position.
2. Turn the ignition switch to the "LOCK (OFF)"

position, and then set the M.U.T.-III.

3. Check that the selector lever is "N" position, and

then start the vehicle engine.

4. Operate the M.U.T.-III to execute the actuator test

while depressing the brake pedal. When
executing the actuator test, check that the braking
force changes by rotating the wheel with your
hand.
NOTE: During the actuator test, the ABS warning
lamp illuminates and ABS control is prohibited.
NOTE: When the ABS-ECU is not working due to
the fail-safe, the M.U.T.-III actuator test cannot be
executed.

5. This is indicated as shown above.

6. When it is abnormal as a result of the inspection,

take action as described on the "Judgment table".

AC206895

AD

Diagnosis

connector

MB991827

MB991824

MB991910

AC106011

M.U.T.-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

AD

Approx. 0.05 seconds

Main

Index

Group

TOC

ON-VEHICLE SERVICE

ANTI-SKID BRAKING SYSTEM (ABS)

35B-77

JUDGMENT TABLE

7. Turn the ignition switch to LOCK (OFF) position,

and then remove the M.U.T.-III after the
inspection.

IN THE EVENT OF A DISCHARGED
BATTERY

M1352003500633

WARNING

If the ABS is not operating, the vehicle pos-
ture will be unstable during braking, Do not
drive the vehicle with the ABS-ECU connec-
tor disconnected or with the ABS not operat-
ing 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.

Display on
M.U.T.-III

Operation

Inspection
results

Judgment Cause

Action

01 FR wheel
ABS
02 FL wheel
ABS
03 RR wheel
ABS
04 RL wheel
ABS

• Depress the brake

pedal and lock the
wheels.

• Select a wheel

which is inspected
on the M.U.T.-III
and execute the
actuator test.

• Rotate the wheel

selected and
check the braking
force.

The braking
force has been
weakened for 3
seconds in the
locked states.

Normal

−

−

The wheel is
not locked
when
depressing the
brake pedal.

Trouble

Clogged brake line
other than hydraulic
unit

The inspection
and cleaning of
brake line

Clogged hydraulic
pressure circuit inside
of hydraulic unit

Replace the
hydraulic unit
assembly

The braking
force has not
been
weakened

The improper lines of
hydraulic unit brake
tube

Correct the
lines.

Malfunction of
hydraulic unit solenoid
valve operation

Replace the
hydraulic unit
assembly

Main

Index

Group

TOC

HYDRAULIC UNIT

ANTI-SKID BRAKING SYSTEM (ABS)

35B-78

HYDRAULIC UNIT

REMOVAL AND INSTALLATION

M1352018400104

Pre-removal operation
• Brake Fluid Draining

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

Air Cleaner

P.15-5

).

• Fuel Vapour Canister Removal

(Refer to GROUP 17, Canister

P.17-18

).

Post-installation operation
• Fuel Vapour Canister Installation

(Refer to GROUP 17, Canister

P.17-18

).

• Air cleaner body assembly installation (Refer to GROUP

15, Air Cleaner

P.15-5

).

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

Service

P.35A-10

).

• Hydraulic Unit Check (Refer to

P.35B-76

).

AC208927

AC208498

AB

15 ± 2 N·m

2

2

4

1

5

6

3

7

8 ± 2 N·m

2

N

18 ± 3 N·m

N

18 ± 3 N·m

Removal steps

<<

A

>>

1.

ABS-ECU harness connector

>>

A

<<

2.

Brake tube connection

3.

Fuel vapour canister bracket

4.

Connection of brake tube and clip

<<

B

>>

5.

Hydraulic unit (ABS-ECU)

6.

Hydraulic unit bracket insulator

7.

Hydraulic unit bracket

Removal steps (Continued)

Main

Index

Group

TOC

HYDRAULIC UNIT

ANTI-SKID BRAKING SYSTEM (ABS)

35B-79

REMOVAL SERVICE POINTS
<<A>> HARNESS CONNECTOR DISCON-
NECTION

Move the lock lever of the ABS-ECU connector as
shown in the illustration, and then disconnect the
harness connector.

<<B>> HYDRAULIC UNIT (ABS-ECU)
REMOVAL

WARNING

The hydraulic unit is heavy. Use care when
removing it.

CAUTION

• The hydraulic unit cannot be disassembled.

Never loosen its nuts or bolts.

• Do not drop or shock the hydraulic unit.
• Do not turn the hydraulic unit upside down or

lay it on its side.

INSTALLATION SERVICE POINTS
>>A<< BRAKE TUBE INSTALLATION

Install each brake tube according to the colour of the
flare nut as shown.

AC208370AB

Lock lever

AC208649AB

Green

Yellow

Main

Index

Group

TOC