Mitsubishi Lancer Evolution X. Manual — part 176
DIAGNOSIS
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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
.) 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
.)
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
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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
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
STEP 5. Check whether the DTC is reset.
Q: Is DTC C1290 set?
YES : Replace the hydraulic unit (incorporates in
.) Then go to Step 6.
NO : Intermittent malfunction. (Refer to GROUP 00 − How
to Cope with Intermittent Malfunction
.)
STEP 6. Check whether the DTC is reset.
Q: Is DTC C1290 set?
YES : Return to Step 1.
NO : The procedure is complete.
DIAGNOSIS
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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
.)
.
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
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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
.) 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.
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