Mitsubishi Colt Ralliart. Manual - part 230

 

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Mitsubishi Colt Ralliart. Manual - part 230

 

 

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-12

(2) Resistance between ABS-ECU connector A-05 

terminal 6 and front right wheel speed sensor 
A-29 terminal 1

OK: 10 

 or less

(3) Resistance between ABS-ECU connector A-05 

terminal 7 and front right wheel speed sensor 
A-29 terminal 2

OK: 10 

 or less

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness between 
ABS-ECU connector A-05 and front right 
wheel speed sensor connector A-29.

STEP 5. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the 
M.U.T.-III, turn the ignition switch to the "LOCK" 
(OFF) position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

(7) Disconnect M.U.T.-III.

Q: Is code No.C1200 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-78

).

NO : 

The malfunction is intermittent. Refer to 
GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

AC314250

AC314250AB

MB991951

Check 
connector

ABS-ECU

A-05 Harness connector

Connector A-29
(Harness side)

AC314250AC

MB991951

Check 
connector

ABS-ECU

A-05 Harness connector

Connector A-29
(Harness side)

AC206895

AC

Diagnosis

connector

MB991827

MB991824 

MB991910

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-13

Code No.C1201: Wheel speed sensor (FR) system (sensor output failure)

OPERATION

The wheel speed sensor is a pulse generator. It con-
sists of encoder (a plate on which north and south 
pole sides of the magnets are arranged alternately) 
for detecting wheel speed which rotates at the same 
speed as the road wheels. This sensor sends fre-
quency pulse signals in proportion to wheel speed.
The pulse signals, which the wheel speed sensor 
creates, are sent to the ABS-ECU. The ABS-ECU 
uses the frequency of the pulse signals to determine 
the wheel speed.

DIAGNOSIS CODE SET CONDITIONS

The ABS-ECU monitors the signals from the wheel 
speed sensors during driving. If the ECU detects 
malfunctions below, it sets the diagnosis code.

• Missing of wheel speed sensor signals

• When an abnormal wheel speed sensor signal is 

received

• When one of the wheel speed sensor signals 

(from the front, rear, right and left wheels) is sig-
nificantly different from the others

PROBABLE CAUSES

• Improperly installed wheel speed sensor

• Presence of dirt or other foreign particles on the 

encoder of the wheel speed sensor

• Deformed encoder of the wheel speed sensor

• Excessive gap between the wheel speed sensor 

and its encoder

• Damaged wiring harness or connector

• Malfunction of the wheel speed sensor

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

FRONT WHEEL SPEED SENSOR

(LH)

(RH)

(LH)

(RH)

ABS-ECU

REAR WHEEL SPEED SENSOR

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

 Wheel Speed Sensor Circuit

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-14

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-29 front right wheel 
speed sensor connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Remove the front right wheel speed 
sensor and check it.
Refer to 

P.35B-81

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the front right wheel speed sensor 
(Refer to 

P.35B-80

).

STEP 3. Check the wheel bearing for excessive 
play.
Front: refer to GROUP 26, On-vehicle Service 

− 

Wheel Bearing Axial Play Check 

P.26-5

.

Rear: refer to GROUP 27, On-vehicle Service 

− 

Wheel Bearing Axial Play Check 

P.27-3

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the hub assembly (Refer to 
GROUP 26, Front Axle Hub Assembly 

P.26-6

).

STEP 4. Check the encoder for detecting wheel 
speed.
Check the encoder for presence of foreign objects or 
deformation.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

If foreign objects are found, clean the 
encoder. If deformation is found, replace the 
hub (Refer to GROUP 26, Front Axle Hub 
Assembly 

P.26-9

).

STEP 5. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the 
M.U.T.-III, turn the ignition switch to the "LOCK" 
(OFF) position.
Check again if the diagnosis code is set.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the diagnosis code.
(3) Turn the ignition switch to the "LOCK" (OFF) 

position.

(4) Turn the ignition switch to the "ON" position.
(5) Check if the diagnosis code is set.
(6) Turn the ignition switch to the "LOCK" (OFF) 

position.

(7) Disconnect M.U.T.-III.

Q: Is code No.C1201 set?

YES : 

Replace the hydraulic unit (integrated with 

ABS-ECU) (Refer to 

P.35B-78

).

NO : 

The malfunction is intermittent. Refer to 
GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− 

How to Cope with Intermittent Malfunction 

P.00-13

.

AC313860AF

Connector : A-29

A-29(B)

Harness side

AC206895

AC

Diagnosis

connector

MB991827

MB991824 

MB991910

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-15

Code No.C1205: Wheel speed sensor (FL) system (open circuit, short to earth or power supply)

OPERATION

The wheel speed sensor is a pulse generator. It con-
sists of encoder (a plate on which north and south 
pole sides of the magnets are arranged alternately) 
for detecting wheel speed which rotates at the same 
speed as the road wheels. This sensor sends fre-
quency pulse signals in proportion to wheel speed.
The pulse signals, which the wheel speed sensor 
creates, are sent to the ABS-ECU. The ABS-ECU 
uses the frequency of the pulse signals to determine 
the wheel speed.

DIAGNOSIS CODE SET CONDITIONS

The ABS-ECU monitors the voltage change in each 
of the wheel speed sensor circuits. If the ECU 
detects an open or short circuit in any of the circuits, 
the ECU sets the diagnosis code.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the wheel speed sensor

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

FRONT WHEEL SPEED SENSOR

(LH)

(RH)

(LH)

(RH)

ABS-ECU

REAR WHEEL SPEED SENSOR

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

 Wheel Speed Sensor Circuit

Main

Index

Group

TOC

 

 

 

 

 

 

 

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