Mitsubishi Lancer Evolution X. Manual - part 176

 

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Mitsubishi Lancer Evolution X. Manual - part 176

 

 

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-169

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-15

.) After repairing the CAN 

bus line, go to Step 4.

STEP 2. Scan tool diagnostic trouble code
Check that diagnostic trouble code U0100, U0101, U0126, 
U0141, U0136 or U0251 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-22

.)

NO :  Go to Step 3.

STEP 3. Scan tool 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 STABILITY CONTROL SYSTEM (ASC)

35C-170

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

P.00-26

.)

Vehicle line

OK: LANCER EVO

Transaxle

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-742

.) 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-298

.) 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 STABILITY CONTROL SYSTEM (ASC)

35C-171

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-287

P.35C-289

P.35C-294

, and 

P.35C-295

.)

.

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

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-172

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-15

.) 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-48

.)

Q: Is any DTC set?

YES : Troubleshoot the diagnostic trouble code of engine 

control module. (Refer to GROUP 13A − 

Troubleshooting 

P.13A-48

.) 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-298

.) 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.

 

 

 

 

 

 

 

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