Mitsubishi Grandis. Manual - part 939

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-81

Code No.C1505: Steering wheel sensor (signal seizure or abnormal neutral point)
Code No.C1506: Steering wheel sensor (steering sensor malfunction)

<LH drive vehicles>

IGNITION
SWITCH (IG1)

STEERING
WHEEL
SENSOR

COMBINATION
METER

ENGINE-ECU
<M/T>
OR
ENGINE-A/T-ECU
<A/T>

TCL/ASC-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

Steering Wheel Sensor Communication Circuit

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-82

<RH drive vehicles>

IGNITION
SWITCH (IG1)

STEERING
WHEEL
SENSOR

COMBINATION
METER

ENGINE-ECU
<M/T>
OR
ENGINE-A/T-ECU
<A/T>

TCL/ASC-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

Steering Wheel Sensor Communication Circuit

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-83

CAUTION

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

CAUTION

The steering wheel sensor-related diagnosis 
code may be set when diagnosis code No.C1506 
is set. Diagnose the steering wheel sensor first 
when the steering wheel sensor-related 
diagnosis code is set.

OPERATION

• The TCL/ASC-ECU and the steering wheel 

sensor are connected each other via a CAN bus 
line, and the sensor sends the steering wheel 
angle and angular velocity information to the 
ECU.

DIAGNOSIS CODE SET CONDITIONS

• These diagnosis codes will be set under the 

cases below.

Code No.C1505: Steering Wheel Sensor (signal 

seizure or abnormal neutral point)

• The steering wheel sensor output value does not 

fluctuate for more than 60 seconds although the 
vehicle speed is 50 km/h or more and the G and 
yaw late sensor output value is fluctuating.

• The neutral point has been ±15 deg or more and 

running more than 30 km with speed exceeds 10 
km.

Code No.C1506: Steering Wheel Sensor (steering 

sensor malfunction)

• The steering wheel sensor sets the diagnosis 

code.

PROBABLE CAUSES

• Damaged wiring harness or connector

• Malfunction of the steering wheel sensor

• Malfunction of the hydraulic unit (integrated with 

TCL/ASC-ECU)

• Incorrect installing of steering wheel sensor

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.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

TROUBLESHOOTING

TRACTION CONTROL/ACTIVE STABILITY CONTROL SYSTEM

35C-84

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.C1505 or C1506 set? 

YES <C1505 is set> : 

Go to Step 3.

YES <C1506 is set> : 

Check the steering wheel 

sensor diagnosis code, and diagnose the 
diagnosis code (Refer to 

P.35C-118

).

NO : 

The procedure is complete.

STEP 3. MUT-III data list

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) Set MUT-III to data reading mode.

• Item 32: Steering angle

OK: Correct angle is displayed as the 
steering wheel is turned.

Q: Is the check result normal?

YES : 

Go to step 6.

NO : 

Align the steering wheel sensor neutral 
point and carry out calibration (Refer to 

P.35C-168

). Then go to Step 4.

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824

AC302297

AC310120

AB

MB991827

16-pin

MB991910

MB991824