Mitsubishi Colt Ralliart. Manual — part 229

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-8

NOTE: *: This diagnosis code may be set if the
wheels spin or slip for a certain period (10 seconds
ore more). Verify the customer whether he/she
encountered such a driving condition. If yes, erase
the diagnosis code and complete the diagnosis proc-
ess. If no, there may be electrical noise in the wheel
speed sensor line. For each of the wheel speed sen-
sors, carry out troubleshooting (diagnosis code;
C1201, C1206, C1211 and C1216).

C1225*

Wheel speed sensor system
(sensor output failure)

Stores the diagnosis code if
the ABS control continues
for one minutes or more, or
the failed wheel is not
identified.

−

C1226

Control solenoid valve (FR) pressure holding system

Replace the hydraulic
unit (Integrated with
ABS-ECU) (Refer to

P.35B-78

).

C1231

Control solenoid valve (FR) decompressing system

C1236

Control solenoid valve (FL) pressure holding system

C1241

Control solenoid valve (FL) pressure reducing system

C1246

Control solenoid valve (RR) pressure holding system

C1251

Control solenoid valve (RR) pressure reducing system

C1256

Control solenoid valve (RL) pressure holding system

C1261

Control solenoid valve (RL) decompressing system

C1266

Motor system (stuck)

P.35B-33

C1273

Motor relay stuck off

P.35B-38

C1274

Motor relay stuck on

P.35B-41

C1276

Valve relay system

P.35B-44

C1278

Valve relay system stuck off

P.35B-46

C1279

Valve relay system stuck on

Replace the hydraulic
unit (Integrated with
ABS-ECU) (Refer to

P.35B-78

).

C1607

Trouble in ABS-ECU

Replace the hydraulic
unit (Integrated with
ABS-ECU) (Refer to

P.35B-78

).

C1860

ABS-ECU power supply system (abnormal voltage increase)
(16.8

± 1.0 V or more)

P.35B-49

C1861

ABS-ECU power supply system (abnormal voltage drop) (9.6
± 0.3 V or more: ABS prohibit, 7.6 ± 0.3 V or less: ABS and
EBD prohibit)

P.35B-50

U1073

Trouble in CAN bus system

P.35B-55

Diagnosis code
No.

Inspection item

Diagnostic content

Reference page

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-9

DIAGNOSIS TROUBLE CODE
PROCEDURES

Code No.C1200: Wheel speed sensor (FR) 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

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-10

DIAGNOSIS PROCEDURE

STEP 1. 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 2.

NO :

Replace the front right wheel speed sensor
(Refer to

P.35B-80

).

STEP 2. Check the front right wheel speed
sensor connector A-29.

Check the connectors, for loose, corroded or dam-
aged terminals, or terminals pushed back in the con-
nector.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair or replace the damaged
component(s). Refer to GROUP 00, How to
Use Troubleshooting/Inspection Service
Points

− Connector Inspection Service

Points

P.00-11

.

STEP 3. Check the continuity (short to earth) at
ABS-ECU connector A-05.

(1) Disconnect the front right wheel speed sensor

connector A-29 and ABS-ECU connector A-05,
and connect special tool ABS Check Harness
(MB991951) to the wiring harness-side
connector.

AC313860AF

Connector : A-29

A-29(B)

Harness side

AC313863AB

Connector: A-05

Harness side

A-05(B)

AC314249AB

ABS-ECU

MB991951

Check connector

A-05 Harness connector

AC313860AF

Connector : A-29

A-29(B)

Harness side

Main

Index

Group

TOC

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-11

NOTE: Do not connect special tool ABS Check
Harness (MB991951) to the ABS-ECU.

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

terminal 6 and body earth

OK: No continuity

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

terminal 7 and body earth

OK: No continuity

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

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

STEP 4. Resistance measurement at ABS-ECU
connector A-05.

(1) Disconnect the front right wheel speed sensor

connector A-29 and ABS-ECU connector A-05,
and connect special tool ABS Check Harness
(MB991951) to the wiring harness-side
connector.
NOTE: Do not connect special tool ABS Check
Harness (MB991951) to the ABS-ECU.

AC313972BC

Harness side

A-05

1

2

3

4

5

7

8

9

10

11

18

19

20

21

22

13

14

15

16

17

6

12

23

24

25

26

AC313972BD

Harness side

A-05

1

2

3

4

5

7

8

9

10

11

18

19

20

21

22

13

14

15

16

17

6

12

23

24

25

26

AC313863AB

Connector: A-05

Harness side

A-05(B)

AC314249AB

ABS-ECU

MB991951

Check connector

A-05 Harness connector

AC313860AF

Connector : A-29

A-29(B)

Harness side

Main

Index

Group

TOC