Mitsubishi Colt Ralliart. Manual - part 630

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-65

Q: Is the diagnosis code No. C1385 set?

YES : 

Replace the ASC-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

.)

STEP 6. Diagnosis code recheck
(1) Ignition switch: ON
(2) Erase the diagnosis code.
(3) Ignition switch: LOCK (OFF) position
(4) Start the engine.
(5) Drive the vehicle at 40 km/h or more.

Q: Is the diagnosis code No. C1385 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Code No. C1387: Lateral G-sensor error

CAUTION

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

OPERATION

The G and yaw rate sensor output signal is sent to 
ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS

If an abnormality is judged to have occurred in the G 
and yaw rate sensor, the G and yaw rate sensor 
sends a diagnostic signal to ASC-ECU. When 
ASC-ECU receives this diagnostic signal, it deter-
mines that the sensor has a trouble and sets the 
diagnosis code.

Current trouble

• G and yaw rate sensor malfunction

• Driving under special conditions (bad road, etc.)

• ASC-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus lines. (Refer to GROUP 
54D 

− Troubleshooting 

P.54D-13

.) On 

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines

Q: Is the diagnosis code No. C1387 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. G and yaw rate sensor installation state 
check 
Check that the G and yaw rate sensor is installed 
correctly (not tilted).

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

 Reinstall the G and yaw rate sensor 
correctly.

STEP 4. M.U.T.-III data list
Check the following service data.(Refer to 

P.35C-109

.)

• Item No. 14: Lateral G-sensor

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the G and yaw rate sensor, and 
then go to Step 6.

STEP 5. Diagnosis code recheck
(1) Ignition switch: ON
(2) Erase the diagnosis code.
(3) Ignition switch: LOCK (OFF) position
(4) Start the engine.
(5) Drive the vehicle at 40 km/h or more.

Q: Is the diagnosis code No. C1387 set?

YES : 

Replace the ASC-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

.)

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-66

STEP 6. Diagnosis code recheck
(1) Ignition switch: ON
(2) Erase the diagnosis code.
(3) Ignition switch: LOCK (OFF) position
(4) Start the engine.

(5) Drive the vehicle at 40 km/h or more.

Q: Is the diagnosis code No. C1387 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Code No. C1388: Yaw rate sensor active check error

CAUTION

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

OPERATION

The G and yaw rate sensor output signal is sent to 
ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU monitors the G and yaw rate sensor out-
put signal, and when an abnormality is present in the 
signal from the G and yaw rate sensor, the ECU 
determines that the trouble occurs and sets the diag-
nosis code.

Current trouble

• G and yaw rate sensor malfunction

• ASC-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus lines. (Refer to GROUP 
54D 

− Troubleshooting 

P.54D-13

.) On 

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines

Q: Is the diagnosis code No. C1371 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III data list
Check the following service data.(Refer to 

P.35C-109

.)

• Item No.17: Yaw rate sensor

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the G and yaw rate sensor, and 
then go to Step 5.

STEP 4. Diagnosis code recheck
(1) Ignition switch: ON
(2) Erase the diagnosis code.
(3) Ignition switch: LOCK (OFF) position
(4) Start the engine.
(5) Drive the vehicle at 40 km/h or more.

Q: Is the diagnosis code No. C1388 set?

YES : 

Replace the ASC-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

.)

STEP 5. Diagnosis code recheck
(1) Ignition switch: ON
(2) Erase the diagnosis code.
(3) Ignition switch: LOCK (OFF) position
(4) Start the engine.
(5) Drive the vehicle at 40 km/h or more.

Q: Is the diagnosis code No. C1388 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-67

Code No. C1394: Steering wheel sensor neutral point not learned

OPERATION

The steering wheel sensor output signal is sent to 
ASC-ECU via the CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU receives the information of the steering 
wheel sensor calibration from the steering wheel 
sensor. When this information indicates that the cali-
bration is not performed, the ECU sets the diagnosis 
code.

PROBABLE CAUSES

• Steering wheel sensor calibration not imple-

mented

• ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the following service data.(Refer to 

P.35C-109

.)

• Item No. 30: SAS calibration flag

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Perform calibration of steering wheel 
sensor.(Refer to 

P.35C-119

.) Then go to 

Step 2.

STEP 2. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position
(3) Ignition switch: ON

Q: Is the diagnosis code No. C1394 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Code No. C1396: Engine torque intervention rejection

CAUTION

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

OPERATION

ASC-ECU receives the engine system-related signal 
from the engine ECU via CAN bus lines. 

DIAGNOSIS CODE SET CONDITIONS

When the torque request rejection signal from the 
engine ECU indicates the rejection state, ASC-ECU 
determines that the trouble occurs and sets this diag-
nosis code.

Current trouble

• Engine ECU malfunction

• ASC-ECU malfunction

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus lines. (Refer to GROUP 
54D 

− Troubleshooting 

P.54D-13

.) On 

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines

Q: Is the diagnosis code No. C1396 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code for other 
systems
Check that the engine ECU sets a diagnosis code.

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Troubleshoot the engine-ECU.  (Refer to 
GROUP 13B 

− Troubleshooting 

P.13B-18

.)

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-68

STEP 4. M.U.T.-III diagnosis code
Check if the diagnosis code other than the code No. 
C1396 is set from ASC-ECU.

Q: Is the diagnosis code other than the code No. 

C1396 set?
YES : 

Troubleshoot for the relevant diagnosis 

code. (Refer to 

P.35C-6

.)

NO : 

Replace the engine ECU. Then go to Step 
5.

STEP 5. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position
(3) Ignition switch: ON

Q: Is the diagnosis code No. C1396 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Code No. C1505: Steering wheel sensor error

OPERATION

The steering wheel sensor output signal is sent to 
ASC-ECU via the dedicated CAN bus lines.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU monitors the signal from the steering 
wheel sensor, when an abnormal signal is output 
from the steering wheel sensor, the ECU determines 
that the trouble occurs and sets the diagnosis code.

PROBABLE CAUSES

• Steering wheel sensor malfunction

• Steering wheel sensor improper installation

• Steering wheel sensor calibration error

• ASC-ECU malfunction

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III data list
With the front wheel facing in the straight-ahead 
direction, check the steering wheel sensor signal 
using the data list. Check that the data list shows the 
deviation within 

±5° from the neutral position.(Refer 

to 

P.35C-109

.)

• Item No. 16: Steering angle sensor

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Perform calibration of steering wheel 
sensor.(Refer to 

P.35C-119

.)

STEP 2. Steering wheel sensor installation state 
check
Check that the steering wheel sensor is installed cor-
rectly.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Install the steering wheel sensor correctly.

STEP 3. M.U.T.-III data list
Turn the steering wheel fully to the left, and then turn 
it fully to the right. Then check that the value of the 
steering wheel sensor changes smoothly using the 
data list. In addition, check that the steering wheel 
angle on the data list almost matches the actual 
steering wheel angle.(Refer to 

P.35C-109

.)

• Item No. 16: Steering angle sensor

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

After the steering wheel is replaced, perform 
the steering wheel sensor calibration.(Refer 
to 

P.35C-119

.)

STEP 4. Diagnosis code recheck
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) position
(3) Ignition switch: ON

Q: Is diagnosis code No. C1505 set?

YES : 

Replace the ASC-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Cope with Intermittent 

Malfunction 

P.00-13

.)

Main

Index

Group

TOC