Mitsubishi Evolution X. Manual - part 788

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-159

DTC C1290: CAN time-out error

CAUTION

• If diagnostic trouble code No. C1290 is set in ASC-ECU, 

always diagnose the CAN bus lines. If there is any fault 
in the CAN bus lines, an incorrect DTC may be set.

• When the diagnostic trouble code No. C1290 is set in 

ASC-ECU, a diagnostic trouble code for another system 
may also be set. When the diagnostic trouble code for 
another system is set, carry out diagnosis for that sys-
tem first.

• Whenever the ECU is replaced, ensure that the commu-

nication circuit is normal.

• When the steering wheel sensor is replaced, always 

perform calibration to make ASC-ECU learn the neutral 
point. (Refer to 

P.35C-267

.)

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always perform the calibration of steering 
wheel sensor, G and yaw rate sensor, brake fluid pres-
sure sensor, cut valve, and inlet valve.(Refer to 

P.35C-266

, 

P.35C-267

, 

P.35C-268

, and 

P.35C-269

.)

.

CIRCUIT OPERATION

ASC-ECU receives signals necessary for the operations of 
ABS, skid control, and TCL from the engine control module, 
transaxle assembly (with built-in ECU) <TC-SST>, 
S-AWC-ECU, ETACS-ECU, and the steering wheel sensor via 
the CAN bus lines.

.

DTC SET CONDITIONS

This diagnostic trouble code is stored if ASC-ECU cannot 
receive signals necessary for the operations of ABS, skid con-
trol, and TCL from the engine control module, transaxle assem-
bly (with built-in ECU) <TC-SST>, S-AWC-ECU, ETACS-ECU, 
and the steering wheel sensor.

.

PROBABLE CAUSES

• Engine ECU malfunction

• Malfunction of transaxle assembly <TC-SST>

• S-AWC-ECU malfunction

• ETACS-ECU malfunction

• Steering wheel sensor malfunction

• Malfunction of the CAN bus

• ASC-ECU malfunction

• Local CAN-bus line malfunction

• Interchanging of ETACS-ECU with another vehicle

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-160

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus 
lines.
Using scan tool MB991958, diagnose the CAN bus lines.
Q: Is the check result normal?

YES : Go to Step 2.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-14

.) After repairing the CAN 

bus line, go to Step 4.

STEP 2. Scan tool diagnostic trouble code
Check that diagnostic trouble codes U0100, U0101, U0126, 
U0141, U0136 and U0251 are set in ASC-ECU.
Q: Is any DTC set?

YES : Perform troubleshooting for the diagnostic trouble 

code that is set. ( Refer to 

P.35C-20

.)

NO :  Go to Step 3.

STEP 3. M.U.T.-III diagnostic trouble code for other 
systems
Using scan tool MB991958, check if the diagnostic trouble 
codes are set from the engine control module, transaxle 
assembly (with built-in ECU) <TC-SST>, S-AWC-ECU, and 
ETACS-ECU.
Q: Is any DTC set?

YES : Perform troubleshooting for the diagnostic trouble 

code that is set. Then go to Step 4.

NO :  Go to Step 4.

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-161

STEP 4. ETACS-ECU coding data check
Check the following coding data stored in ETACS-ECU. (Refer 
to GROUP 00 

− Coding Table 

P.00-39

.)

Vehicle line

OK: LANCER EVO

Transmission

OK (Vehicles without TC-SST): 5MT
OK (Vehicles with TC-SST): TC-SST

Engine type

OK: D4 V.V.T. 2.0L TC

Engine power

OK: Normal

Chassis Type for A.S.C.

OK: Type 1

Final drive

OK: AWD FF Base

Transfer

OK: ACD

SAS

OK: Present

AWD

OK: Not present

TCM

OK (Vehicles without TC-SST): Not present
OK (Vehicles with TC-SST): Present

ACDAYC

OK: Present

Q: Is the check result normal?

YES : Go to Step 5.
NO :  Replace the ETACS-ECU. (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-676

.) Then go to Step 6.

STEP 5. Check whether the DTC is reset.
Q: Is DTC C1290 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-272

.) Then go to Step 6.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 6. Check whether the DTC is reset.
Q: Is DTC C1290 set?

YES : Return to Step 1.
NO :  The procedure is complete.

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-162

DTC C2203: VIN not recorded

CAUTION

• If there is any problem in the CAN bus lines, an incor-

rect diagnostic trouble code may be set. Prior to this 
diagnosis, diagnose the CAN bus lines.

• When another diagnostic trouble code for ASC-ECU is 

set, troubleshoot that diagnostic trouble code first.

• Whenever the ECU is replaced, ensure that the CAN 

bus lines are normal.

• This diagnostic trouble code is set after ASC-ECU is 

swapped and the ignition switch is turned ON for the 
first time. However, on and after the second time, the 
diagnostic trouble code will not be set when ASC-ECU 
successfully receives the normal vehicle information 
from the engine control module.

• When the hydraulic unit (integrated with ASC-ECU) is 

replaced, always perform the calibration of steering 
wheel sensor, G and yaw rate sensor, brake fluid pres-
sure sensor, cut valve, and inlet valve.(Refer to 

P.35C-266

, 

P.35C-267

, 

P.35C-268

, and 

P.35C-269

.)

.

CIRCUIT OPERATION

ASC-ECU receives vehicle information from the engine control 
module and stores it.

.

DTC SET CONDITIONS

This diagnostic trouble code is set when ASC-ECU cannot 
receive the vehicle information, after the ignition switch is 
turned ON, from the engine control module.

.

PROBABLE CAUSES

• Malfunction of the CAN bus

• Engine ECU malfunction

• ASC-ECU malfunction

• First ignition switch ON after replacement of ASC-ECU

DIAGNOSIS

Required Special Tools:

• MB991958 Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827 M.U.T.-III USB Cable

• MB991910 M.U.T.-III Main Harness A