Mitsubishi Lancer Evolution X. Manual — part 177

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-173

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

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-15

.) After repairing the CAN

bus line, go to Step 7.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-174

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-22

NO : Go to Step 3.

STEP 3. Scan tool diagnostic trouble code for other
systems
Use scan tool to check that the vehicles information-related
DTC is set by the ETACS-ECU.
Q: Is any DTC set?

YES : Troubleshoot the relevant diagnostic trouble code,

and then go to Step 4.

NO : Go to Step 4.

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

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 6.
NO : Go to Step 5.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-175

STEP 5. ETACS-ECU variant coding
Perform the variant coding to the ETACS-ECU.
Q: Dose variant coding succeed?

YES : Go to Step 7.
NO : Replace the ETACS-ECU (Refer to GROUP 54A −

ETACS-ECU

P.54A-742

), and then go to Step 7.

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 : Replace the hydraulic unit (incorporates in

ASC-ECU).(Refer to

P.35C-298

.) Then go to Step 7.

NO : The procedure is complete.

STEP 7. 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.

DTC C1210: Abnormality in G and yaw rate sensor (longitudinal G sensor)

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.

• Whenever the ECU is replaced, ensure that the CAN

bus lines are normal.

• When the steering wheel sensor is replaced, always

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

P.35C-289

• Do not drop the G and yaw rate sensor or subject it to a

shock.

• When the G and yaw rate sensor is replaced, always

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

P.35C-287

• 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

CIRCUIT OPERATION

• ASC-ECU supplies power to the G and yaw rate sensor at

the terminal No. 1.

• The G and yaw rate sensor outputs the signal to ASC-ECU

via the local CAN bus lines.

DIAGNOSIS

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ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-176

DTC SET CONDITIONS

This diagnostic trouble code is set if any malfunction below is
detected.

• Longitudinal G value output from G and yaw rate sensor is

abnormal.

• Abnormality is detected by the self-diagnosis of the longitu-

dinal G sensor.

PROBABLE CAUSES

• G and yaw rate sensor malfunction
• ASC-ECU malfunction
• External noise interference
• The G and yaw rate sensor for FWD is installed.

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 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. Check whether the DTC is reset.
Q: Is DTC C1210 set?

YES : Go to Step 3.
NO : This diagnosis is complete.

STEP 3. Scan tool service data
Check the following service data. (Refer to

P.35C-276

• Item 09: G sensor

Q: Is the check result normal?

YES : Go to Step 4.
NO : Go to Step 5.