Mitsubishi Galant (2004+). Manual - part 521

 

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Mitsubishi Galant (2004+). Manual - part 521

 

 

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-29

STEP 17. Recheck for diagnostic trouble code.

(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1200, C1205, C1210 or C1215 set?

YES : Repeat the troubleshooting from Step 1.
NO :  The procedure is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-30

DTC C1201/C1206/C1211/1216 Wheel Speed Sensor (Abnormal Output Signal)

WHEEL SPEED SENSOR

WHEEL SPEED SENSOR

(REAR: RH)

(REAR: LH)

(FRONT: RH)

(FRONT: LH)

ABS-ECU

Wheel Speed Sensor Circuit

AC305206

A-01 (B)

CONNECTOR: A-01

AT

AC304742

A-02 (GR)

CONNECTOR: A-02

HYDRAULIC UNIT
(WITH BUILT-IN ABS-ECU)

AC

AC305210AI

A-04(B)

CONNECTOR: A-04

AC305231BL

CONNECTOR: C-25

C-25

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-31

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnostic trouble code may be set. 
Prior to this diagnosis, diagnose the CAN bus 
lines.

.

CIRCUIT OPERATION

• A toothed wheel speed rotor generates a voltage 

pulse as it moves across the pickup field of each 
wheel speed sensor.

• The amount of voltage generated at each wheel 

is determined by the clearance between the 
wheel speed rotor teeth and the wheel speed 
sensor, and by the speed of rotation.

• Sends alternating current signals at frequencies 

which are proportional to the rotation speeds of 
each wheel to the ABS electronic control unit 
(ABS-ECU).

• The ABS hydraulic unit modulates the amount of 

braking force individually applied to each wheel 
cylinder.

.

ABS DTC SET CONDITIONS
The ABS-ECU monitors the signals from each wheel 
speed sensor while the vehicle is being driven. If any 
fault below is found in these sensor signals, the ECU 
will set the relevant diagnostic trouble code.

• Missing sensor signal

• Sensor signal, which will not be created under 

normal operation

• Significant difference among the wheel speed 

sensor signals

.

TROUBLESHOOTING HINTS (The most likely 
causes for these DTCs are to set are:)

Current trouble

• Malfunction of the wheel speed sensor or wheel 

speed rotor

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

Past  trouble

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in wheel speed 
sensor circuit. For diagnosis procedures, refer to 
"How to cope with past trouble" (Refer to GROUP 
00, How to use Troubleshooting/Inspection Ser-
vice Points

P.00-6

).

.

Past trouble
For diagnosis procedures, refer to "How to cope with 
past trouble" (Refer to GROUP 00, How to Use Trou-
bleshooting 

P.00-6

).

.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

• MB991970: ABS Check Harness

.

AC305260

F-04

F-07

CONNECTORS: F-04, F-07

AB

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-32

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
line.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?

YES : Go to Step 3
NO :  Repair the CAN bus line (Refer to GROUP 54C, 

Diagnosis 

P.54C-14

).  Then go to Step 2.

STEP 2. Recheck for diagnostic trouble code.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Turn the ignition switch to the "ON" position.
(2) Erase the DTC.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
(4) Turn the ignition switch to the "ON" position.
(5) Check if the DTC is set.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC C1201, C1206, C1211 or C1216 set?

YES : Go to Step 3
NO :  The procedure is complete.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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