Mitsubishi Grandis. Manual - part 902

 

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Mitsubishi Grandis. Manual - part 902

 

 

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-23

Code No.C1201: Front Right Wheel Speed Sensor
Code No.C1206: Front Left wheel Speed Sensor
Code No.C1211: Rear Right wheel Speed Sensor
Code No.C1216: Rear Left wheel Speed Sensor

CAUTION

If there is any problem in the CAN bus lines, an 
incorrect diagnosis code may be set. Diagnose 
the CAN bus lines before the Diagnosis codes 
(Refer to GROUP 54D, CAN bus-line diagnostic 
flow 

P.54D-9

).

OPERATION

• Wheel speed sensor is a kind of a pulse 

alternator. It consists of encoders (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 of the 
wheels and wheel speed sensors. This sensor 
outputs frequency pulse signals in proportion to 
wheel speed.

• The wheel speed sensors transmit the frequency 

of the voltage pulses and the amount of voltage 
generated by each pulse to the ABS-ECU.

(FRONT: LH)

(FRONT: RH)

(REAR: LH)

(REAR: RH)

WHEEL SPEED SENSOR

ABS-ECU

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

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-24

DIAGNOSIS CODE SET CONDITIONS

The ABS-ECU monitors the signals from each wheel 
speed sensor while the vehicle is being driven. If any 
faults below are found in these sensor signals, the 
ECU will set the relevant diagnosis code.

• Missing sensor signal

• Sensor signal, which will not be created under 

normal operation

• Significant difference among the wheel speed 

sensor signals

PROBABLE CAUSES

The most likely causes for these diagnosis codes to 
set are:

• Malfunction of the wheel speed sensor

• Damaged wiring harness or connector

• Malfunction of the hydraulic unit (integrated with 

ABS-ECU)

DIAGNOSIS

STEP 1. MUT-III CAN bus diagnostics

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(1) Connect MUT-III to the 16-pin diagnosis 

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 check result normal?

YES : 

Go to Step 3

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, CAN bus line Diagnostic flow 

P.54D-9

). Then go to Step 2.

STEP 2. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
(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.

Q: Is code No.C1201, C1206, C1211 and C1216 set?

YES : 

Go to Step 3.

NO : 

The procedure is complete.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-25

STEP 3. Check whether the diagnosis code is 
reset.

CAUTION

Before connecting or disconnecting the MUT-III, 
turn the ignition switch to the "LOCK" (OFF) 
position.
Use MUT-III to check whether diagnosis codes 
No.C1200, C1205, C1210 and C1215 have been set 
simultaneously.
(1) Connect MUT-III to the 16-pin diagnosis 

connector.

(2) Turn the ignition switch to the "ON" position.
(3) Check whether diagnosis codes No.C1200, 

C1205, C1210 or C1215 have been set.

(4) Turn the ignition switch to the "LOCK" (OFF) 

position.

Q: Is codes No.C1200, C1205, C1210 or C1215 set?

YES : 

Carry out diagnosis relevant to diagnosis 

codes No.C1200, C1205, C1210 or C1215 
(Refer to 

P.35B-9

).

NO : 

Go to Step 4.

STEP 4. Check the installation condition of the 
wheel speed sensors.

For the wheel speed sensor, which the diagnosis 
code indicates, check whether the sensor or its 
mounting bolts are loosened.

• Code No.C1201 is set: Front right wheel speed 

sensor

• Code No.C1206 is set: Front left wheel speed 

sensor

• Code No.C1211 is set: Rear right wheel speed 

sensor

• Code No.C1216 is set: Rear left wheel speed 

sensor

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Reinstall the wheel speed sensor correctly. 
Then go to Step 15.

STEP 5. Check the wheel speed sensor after it is 
removed from the vehicle.

Check the wheel speed sensor, which the diagnosis 
code indicates (Refer to 

P.35B-81

).

• Code No.C1201 is set: Front right wheel speed 

sensor

• Code No.C1206 is set: Front left wheel speed 

sensor

• Code No.C1211 is set: Rear right wheel speed 

sensor

• Code No.C1216 is set: Rear left wheel speed 

sensor

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Replace the wheel speed sensor. Then go 
to Step 15.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

ANTI-SKID BRAKING SYSTEM (ABS)

35B-26

STEP 6. Check the wheel bearing for looseness.
NOTE: If the wheel bearing is loose, the gap 
between the wheel speed sensor and rotor may 
become excessive. Check the wheel bearing, which 
diagnosis code indicates, for looseness.

• Code No.C1201 is set: Check the front right 

wheel bearing (Refer to GROUP 26, On-vehicle 
service 

− Hub axial play check 

P.26-6

).

• Code No.C1206 is set: Check the front left wheel 

bearing (Refer to GROUP 26, On-vehicle service 
− Hub axial play check 

P.26-6

).

• Code No.C1211 is set: Check the rear right wheel 

bearing (Refer to GROUP 27, On-vehicle service 
− Wheel bearing axial play check 

P.27-3

).

• Code No.C1216 is set: Check the rear left wheel 

bearing (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 7.

NO (front hub axial play is not within the standard 
value) : 

Replace the front hub assembly (Refer to 

GROUP 26, Front axle hub assembly 

P.26-8

). Then go to Step 15.

NO (rear wheel bearing axial play is not within the 
standard value) : 

Replace the rear hub assembly 

(Refer to GROUP 27, Rear axle hub 
assembly 

P.27-5

). Then go to Step 15.

STEP 7. Check the vehicle speed detection 
encoder.

Check the vehicle speed detection encoder, which 
diagnosis code indicates, for foreign material or 
deformation.

• Code No.C1201 is set: Front right wheel speed 

sensor

• Code No.C1206 is set: Front left wheel speed 

sensor

• Code No.C1211 is set: Rear right wheel speed 

sensor

• Code No.C1216 is set: Rear left wheel speed 

sensor

Q: Is the check result normal?

YES : 

Go to Step 8.

NO (front hub axial play is not within the standard 
value) : 

If the vehicle speed detection encoder is 

contaminated with foreign material, clean it. 
If the front hub assembly is deformed, 
replace it (Refer to GROUP 26, Front axle 
hub assembly 

P.26-8

). Then go to Step 15.

NO (rear wheel bearing axial play is not within the 
standard value) : 

If the vehicle speed detection 

encoder is contaminated with foreign 
material, clean it. If the rear axle hub 
assembly is deformed, replace it (Refer to 
GROUP 27, Rear axle hub assembly 

P.27-5

). Then go to Step 15.

STEP 8. Voltage measurement at ABS-ECU 
connector A-03.

(1) Disconnect the connector A-03, and connect 

special tool ABS Check Harness (MB991974) to 
the wiring harness-side connector.

AC312620AR

Oil reservoir

Connector: A-03

ABS-ECU

MB991974

Check connector

A-03 Harness connector

A-03

Hydraulic unit
(with built-in ABS-ECU)

 

 

 

 

 

 

 

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