Mitsubishi Evolution X. Manual - part 789

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-163

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 3.
NO :  Repair the CAN bus lines. (Refer to GROUP 54C 

− 

Troubleshooting 

P.54C-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. DTC recheck after repairing the CAN bus line
(1) Ignition switch "LOCK" (OFF)
(2) Ignition switch "ON"
Q: Is DTC C2203 set?

YES : Go to Step 3.
NO :  The procedure is complete.

STEP 3. Scan tool diagnostic trouble code for other 
systems
Check if the engine control module sets a DTC. (Refer to 
GROUP 13A 

− Troubleshooting 

P.13A-44

.)

Q: Is any DTC set?

YES : Troubleshoot the diagnostic trouble code of engine 

control module. (Refer to GROUP 13A 

− 

Troubleshooting 

P.13A-44

.) Then go to Step 5.

NO :  Go to Step 4.

STEP 4. Check whether the DTC is reset.
(1) Ignition switch: "LOCK" (OFF) position
(2) Ignition switch: "ON" position
Q: Is DTC C2203 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-272

.) Then go to Step 5.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 5. Check whether the DTC is reset.
(1) Ignition switch: "LOCK" (OFF) position
(2) Ignition switch: "ON" position
Q: Is DTC C2203 set?

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

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-164

DTC C2206: Re-execution of variant coding

CAUTION

• If diagnostic trouble code No. C2206 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.

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

nication circuit is normal.

• When diagnostic trouble code No. C2206 is set in 

ASC-ECU, the diagnostic trouble code may also be set 
in ETACS-ECU. When the diagnostic trouble code is set 
in ETACS-ECU, perform the diagnosis of the diagnostic 
trouble code for ETACS-ECU first.

• 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 the vehicle information stored in 
ETACS-ECU via CAN bus lines.

.

DTC SET CONDITIONS

ASC-ECU communicates with ETACS-ECU via CAN bus lines. 
This diagnostic trouble code is set if the vehicle information 
stored in ETACS-ECU has been altered from the one that was 
stored at the previous ignition switch ON.

.

PROBABLE CAUSES

• ETACS-ECU or ASC-ECU which was equipped with other 

vehicle is used.

• Malfunction of ETACS-ECU

• ASC-ECU malfunction

• External noise interference

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 6.

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-165

STEP 2. Scan tool diagnostic trouble code
Check that the diagnostic trouble code U1415 or U1417 is 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. Scan tool diagnostic trouble code for other 
systems
Use scan tool to check that the ETACS-ECU-related diagnostic 
trouble code is set.
Q: Is any DTC set?

YES : Troubleshoot the relevant diagnostic trouble code, 

and then go to Step 4.

NO :  Go to Step 4.

DIAGNOSIS

TSB Revision

ACTIVE SKID CONTROL SYSTEM (ASC)

35C-166

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 5.

STEP 5. Check whether the DTC is reset.
(1) Ignition switch: "LOCK" (OFF) position.
(2) Ignition switch: "ON" position.
Q: Is DTC C2206 set?

YES : Replace the hydraulic unit (incorporates in 

ASC-ECU).(Refer to 

P.35C-272

.) Then go to Step 6.

NO :  The procedure is complete.

STEP 6. Check whether the DTC is reset.
(1) Ignition switch: "LOCK" (OFF) position.
(2) Ignition switch: "ON" position.
Q: Is DTC C2206 set?

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