Mitsubishi Colt Ralliart. Manual - part 634

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-81

Code No. U1105: G and yaw rate sensor CAN time-out 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.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU receives the steering angle-related sig-
nals from the G and yaw rate sensor via the CAN bus 
lines. When these signals cannot be received, the 
diagnosis code No. U1105 is stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• The connector(s) or wiring harness in the CAN 

bus line between ASC-ECU and the G and yaw 
rate sensor may be damaged, or the G and yaw 
rate sensor power supply circuit or ASC-ECU 
may be faulty.

Past trouble

• If diagnosis code No. U1105 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on connector(s) and wiring harness in 
the CAN bus line between the ASC-ECU and the 
G and yaw rate sensor, and the G and yaw rate 
sensor power supply circuit. For diagnosis proce-
dures, refer to How to treat past trouble (refer to 
GROUP 00, How to Use Troubleshooting/Inspec-
tion Service Points 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines.  In this case, refer to 
GROUP 00 

−

 How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-13

 and check 

the CAN bus lines. You can narrow down the 
possible cause of the trouble by referring to the 
diagnosis code, which is set regarding the CAN 
communication-linked ECUs. (Refer to GROUP 
54D 

−

 CAN Bus Line Diagnostic Flow 

P.54D-7

.)

Probable causes

• G and yaw rate sensor malfunction

• ASC-ECU malfunction

• Damaged wiring harness and connectors

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. U1105 set?

YES : 

Replace the G and yaw rate sensor, and 

then go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. 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. U1105 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-82

Code No. U1406: Acceleration pedal position signal 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.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU receives the engine control sys-
tem-related signals from the engine ECU via the 
CAN bus lines. When the information on trouble is 
included in these signals, this diagnosis code is 
stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the ASC-ECU and the 
engine-ECU, the power supply system to the 
engine-ECU, or the ASC-ECU itself may be 
defective.

Past trouble

• If diagnosis code No. U1406 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the ASC-ECU and the 
engine-ECU, and the power supply system to the 
engine-ECU. For diagnosis procedures, refer to 
How to treat past trouble (refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines.  In this case, refer to 
GROUP 00 

−

 How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-13

 and check 

the CAN bus lines. You can narrow down the 
possible cause of the trouble by referring to the 
diagnosis code, which is set regarding the CAN 
communication-linked ECUs. (Refer to GROUP 
54D 

−

 CAN Bus Line Diagnostic Flow 

P.54D-7

.)

Probable causes

• Engine ECU malfunction

• ASC-ECU malfunction

• Damaged wiring harness and connectors

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. U0406 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code for other 
systems
Use M.U.T.-III to check that the diagnosis code is set 
in the other systems.

Q: Is the diagnosis code set?

YES : 

Troubleshoot for the relevant diagnosis 

code.

NO : 

Replace the engine ECU, and then go to 
Step 4.

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 the diagnosis code No. U0406 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-83

Code No. U1426: Engine speed signal 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.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU receives the engine speed-related signals 
from the engine ECU via the CAN bus lines. When 
the information on trouble is included in these sig-
nals, this diagnosis code is stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the ASC-ECU and the 
engine-ECU, the power supply system to the 
engine-ECU, or the ASC-ECU itself may be 
defective.

Past trouble

• If diagnosis code No. U1426 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the CAN 
bus line between the ASC-ECU and the 
engine-ECU, and the power supply system to the 
engine-ECU. For diagnosis procedures, refer to 
How to treat past trouble (refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines.  In this case, refer to 
GROUP 00 

−

 How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-13

 and check 

the CAN bus lines. You can narrow down the 
possible cause of the trouble by referring to the 
diagnosis code, which is set regarding the CAN 
communication-linked ECUs. (Refer to GROUP 
54D 

−

 CAN Bus Line Diagnostic Flow 

P.54D-7

.)

Probable causes

• Engine ECU malfunction

• ASC-ECU malfunction

• Damaged wiring harness and connectors

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. U1426 set?

YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code for other 
systems
Use M.U.T.-III to check that the diagnosis code is set 
in the other systems.

Q: Is the diagnosis code set?

YES : 

Troubleshoot for the relevant diagnosis 

code.

NO : 

Replace the engine ECU, and then go to 
Step 4.

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 the diagnosis code No. U1426 set?

YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Main

Index

Group

TOC

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-84

Code No. U1427: Engine torque signal error

 

Code No. U1428: Engine's maximum torque signal error

 

Code No. U1429: Engine's minimum torque signal error

 

Code No. U1430: Engine's torque request signal 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.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU receives the engine torque-related signals 
from the engine ECU via the CAN bus lines. When 
the information on trouble is included in these sig-
nals, this diagnosis code is stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the ASC-ECU and the 
engine-ECU, the power supply system to the 
engine-ECU, or the ASC-ECU itself may be 
defective.

Past trouble

• If diagnosis code No. U1427, U1428, U1429, or 

U1430 is stored as a past trouble, carry out diag-
nosis with particular emphasis on connector(s) 
and wiring harness in the CAN bus line between 
the ASC-ECU and the engine ECU, and the 
power supply circuit to the engine ECU. For diag-
nosis procedures, refer to How to treat past trou-
ble (refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-13

).

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines.  In this case, refer to 
GROUP 00 

−

 How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-13

 and check 

the CAN bus lines. You can narrow down the 
possible cause of the trouble by referring to the 
diagnosis code, which is set regarding the CAN 
communication-linked ECUs. (Refer to GROUP 
54D 

−

 CAN Bus Line Diagnostic Flow 

P.54D-7

.)

Probable causes

• Engine ECU malfunction

• ASC-ECU malfunction

• Damaged wiring harness and connectors

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. U1427, U1428, U1429, or 

U1430 set?
YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code for other 
systems
Use M.U.T.-III to check that the diagnosis code is set 
in the other systems.

Q: Is the diagnosis code set?

YES : 

Troubleshoot for the relevant diagnosis 

code.

NO : 

Replace the engine ECU, and then go to 
Step 4.

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 the diagnosis code No. U1427, U1428, U1429, or 

U1430 set?
YES : 

Replace the ASC-ECU.

NO : 

This diagnosis is complete.

Main

Index

Group

TOC