Mitsubishi Galant 9G. Manual — part 1606

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-8

HOW TO DIAGNOSE THE CAN BUS LINE

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

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. Select "CAN bus diagnosis" from the start-up screen.
4. When the vehicle information is displayed, confirm that it

matches the vehicle whose CAN bus lines will be
diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

5. Select "view vehicle information" button.
6. When the vehicle information is displayed, confirm again

that it matches the vehicle which is being diagnosed.

• If they match, go to step 8.

• If not, go to step 5.

7. Press the "OK" button.
8. When the options are displayed, choose the options (mark

the check) and then select "OK".

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-9

DIAGNOSTIC TROUBLE CODE CHART

M1352011300601

CAUTION

During diagnosis, a DTC code associated with
another system may be set when the ignition
switch is turned on with connector(s) discon-
nected. On completion, confirm all systems for
DTCs. If DTC code(s) are set, erase them all.
Follow the inspection chart that is appropriate for the
diagnostic trouble code.

DTC

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

C1200

Front right wheel speed sensor Open circuit or short circuit

P.35B-10

C1201

Front right wheel speed sensor Abnormal output signal

P.35B-26

C1205

Front left wheel speed sensor

Open circuit or short circuit

P.35B-10

C1206

Front left wheel speed sensor

Abnormal output signal

P.35B-26

C1210

Rear right wheel speed sensor

Open circuit or short circuit

P.35B-10

C1211

Rear right wheel speed sensor

Abnormal output signal

P.35B-26

C1215

Rear left wheel speed sensor

Open circuit or short circuit

P.35B-10

C1216

Rear left wheel speed sensor

Abnormal output signal

P.35B-26

C1226

ABS front right solenoid valve (pressure holding system)

P.35B-39

C1231

ABS front right solenoid valve (depressurizing system)

P.35B-39

C1236

ABS front left solenoid valve (pressure holding system)

P.35B-39

C1241

ABS front left solenoid valve (depressurizing system)

P.35B-39

C1246

ABS rear right solenoid valve (pressure holding system)

P.35B-39

C1251

ABS rear right solenoid valve (depressurizing system)

P.35B-39

C1256

ABS rear left solenoid valve (pressure holding system)

P.35B-39

C1261

ABS rear left solenoid valve (depressurizing system)

P.35B-39

C1266

Motor system (seizure)

P.35B-47

C1273

Motor relay problem (stays off)

P.35B-47

C1274

Motor relay problem (stays on)

P.35B-47

C1278

Valve relay problem (stays off) or ABS-ECU power supply
system problem

P.35B-55

C1279

Valve relay problem (stays on)

P.35B-55

C1395

Brake fluid filling not completed

P.35B-63

C1396*

Engine torque input refusal

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-9

C1397*

Transmission range switch input refusal

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-11

C1607

Trouble in ABS-ECU

P.35B-71

C1860

Power supply system

Abnormal rise in voltage

P.35B-73

C1861

Power supply system

Abnormal drop in voltage

P.35B-73

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-10

NOTE: Since the ABS system is controlled with the same ABS/TCL-ECU used to control the TCL system, the
codes (with a *) used only for the ABS system also appear.
The inspection contents for the codes (with a *) used only for the TCL system do not described in this group.

DIAGNOSTIC TROUBLE CODE PROCEDURES

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

U1073

Bus off

P.35B-79

U1100*

CAN communications system time out error engine related
data

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-13

U1101*

CAN communications system time out error A/T related data

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-17

U1120*

CAN communications system TCL uncontrollable by engine
malfunction

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-21

U1400*

Dynamic range error APS1

GROUP 13D,
Diagnostic Trouble Code
Procedures

P.13D-25

DTC

INSPECTION ITEM

DIAGNOSTIC CONTENT

REFERENCE PAGE

WHEEL SPEED SENSOR

WHEEL SPEED SENSOR

(REAR: RH)

(REAR: LH)

(FRONT: RH)

(FRONT: LH)

ABS-ECU

Wheel Speed Sensor Circuit

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

TSB Revision

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-11

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.

.

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

AC305260

F-04

F-07

CONNECTORS: F-04, F-07

AB