Mitsubishi Evolution X. Manual — part 802

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-215

DTC U1417: Variant coding value invalid (includes faulty installation)

CAUTION

• If diagnostic trouble code No. U1417 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. U1417 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, after turning the ignition switch ON and OFF
(vehicle information from ETACS-ECU is registered),
always perform the calibration of steering wheel sen-
sor, G and yaw rate sensor, brake fluid pressure sen-
sor, cut valve, and inlet valve.(Refer to

, and

CIRCUIT OPERATION

ASC-ECU receives the vehicle information stored in the
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 when the vehicle information
received from ETACS-ECU is invalid.
This diagnostic trouble code is also set when the engine control
module sends the ASC intervention rejection (ASC not sup-
ported) signal consecutively.

PROBABLE CAUSES

• ETACS-ECU malfunction

• Engine ECU malfunction

• ETACS-ECUs have been interchanged between two vehi-

cles.

• ASC-ECU malfunction

• Noise interference

• ASC-ECUs have been interchanged between two vehicles.

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

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-216

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
Q: Is DTC U1417 set?

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

STEP 3. Check for diagnostic trouble codes of other
systems
Check if diagnostic trouble code No. C121C is set in ASC-ECU.
Q: Is the check result normal?

YES : Perform troubleshooting for the diagnostic trouble

code that is set. (Refer to

P.35C-157

NO : Go to Step 4.

STEP 4. Scan tool diagnostic trouble code for other
systems
Using scan tool, check if the ETACS-ECU-related or engine
control module-related diagnostic trouble code is set.
Q: Is any DTC set?

YES : Perform troubleshooting for the diagnostic trouble

code that is set.

NO : Go to Step 5.

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)

35C-217

STEP 5. ETACS-ECU coding data check
Using the scan tool, check if there is any abnormality to the fol-
lowing coding data stored in the ETACS-ECU. (Refer to
GROUP 00

− Coding Table

P.00-39

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 6.
NO : Replace the ETACS-ECU. (Refer to GROUP 54A

−

ETACS-ECU

P.54A-676

.) Then go to Step 10.

STEP 6. Engine control module coding data check
Using the scan tool, check if there is any abnormality to the
coding data stored in the engine control module. (Refer to
GROUP 00

− Coding Table

P.00-39

Q: Is the check result normal?

YES : Go to Step 7.
NO : Replace the engine control module. (Refer to GROUP

13A

− Engine Control Module

P.13A-920

.) Then go to

Step 10.

DIAGNOSIS

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ACTIVE SKID CONTROL SYSTEM (ASC)