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
.) 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
Q: Is any DTC set?
YES : Troubleshoot the diagnostic trouble code of engine
control module. (Refer to GROUP 13A
−
Troubleshooting
.) 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
.) Then go to Step 5.
NO : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
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
.)
.
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
.) 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
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
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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
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
.) 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
.) 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.
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