Mitsubishi Galant (2004+). Manual — part 517

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-13

DIAGNOSTIC TROUBLE CODE PROCEDURES

DTC C1200/C1205/C1210/1215 Wheel Speed Sensor (Open circuit or short circuit)

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

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-14

CAUTION

If there is any problem in the CAN bus lines, an
incorrect diagnostic trouble code may be set.
Diagnose the CAN bus lines before the DTC
(Refer to GROUP 54C, Trouble code diagno-
sis

P.54C-12

).

.

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 voltage fluctuation in each
wheel speed sensor circuit. If the ECU detects a
short or open circuit in the circuit, it will set a diag-
nostic trouble code.

.

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

Current trouble

• Malfunction of the wheel speed sensor

• 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

).

.

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

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-15

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 C1200, C1205, C1210 or C1215 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

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

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ANTI-LOCK BRAKING SYSTEM (ABS)

35B-16

STEP 3. Using scan tool MB991958, check data list.

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) Start the engine.
(3) Set scan tool MB991958 to the data reading mode, and

check the data list items by driving the vehicle.

• Item 01 (DTC C1200 is set): Front right wheel speed

sensor

• Item 02 (DTC C1205 is set): Front left wheel speed sen-

sor

• Item 03 (DTC C1210 is set): Rear right wheel speed

sensor

• Item 04 (DTC C1215 is set): Rear left wheel speed sen-

sor

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Does the speedometer indication match the scan tool

indication?
YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points

− How to

Cope with Intermittent Malfunction

P.00-6

.

NO : Go to Step 4.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827