Mitsubishi Evolution X. Manual — part 343
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-21
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is the relevant wheel speed sensor diagnostic trouble
code No. C1011 <FL>, C101C <FR>, C1027 <RL>, or
C1032 <RR> set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C
− Troubleshooting
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Scan tool service data
Check the service data of the relevant wheel speed sen-
sor.(Refer to
• Item No.22: FL wheel speed sensor <FL>
• Item No.23: FL wheel speed sensor <FR>
• Item No.24: FL wheel speed sensor <RL>
• Item No.25: FL wheel speed sensor <RR>
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
NO : Replace the AWC-ECU.(Refer to
.)
DTC C1014 <FL>, C101F <FR>, C102A <RL>, C1035 <RR>: Wheel speed sensor system
(characteristics abnormality)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect 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.
.
OPERATION
AWC-ECU receives the wheel speed data from
ASC-ECU via the CAN communication.
.
DTC SET CONDITIONS
If one or more of the wheel speed is out of the range
of the specified value, the diagnostic trouble code of
the relevant wheel speed sensor is set.
.
PROBABLE CAUSES
• Malfunction of wheel speed sensor
• Damaged harness wires and connectors
• Malfunction of encoder for wheel speed detection
• Malfunction of ASC-ECU
• Malfunction of AWC-ECU
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-22
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is the relevant wheel speed sensor diagnostic trouble
code No. C1014 <FL>, C101F <FR>, C102A <RL>, or
C1035 <RR> set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C
− Troubleshooting
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Scan tool service data
Check the service data of the relevant wheel speed sen-
sor.(Refer to
• Item No.22: FL wheel speed sensor <FL>
• Item No.23: FL wheel speed sensor <FR>
• Item No.24: FL wheel speed sensor <RL>
• Item No.25: FL wheel speed sensor <RR>
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
NO : Replace the AWC-ECU.(Refer to
.)
DTC C1078: Tire Turning Malfunction
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect 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.
.
OPERATION
AWC-ECU receives the wheel speed data from
ASC-ECU via the CAN communication.
.
DTC SET CONDITIONS
The wheel speed is observed when the steering
angle is in the neutral position, and the code is set
when the wheel speed, which is more than the speci-
fied value, is detected.
.
PROBABLE CAUSES
• Tire with incorrect diameter equipped
• Improper tire pressure
• Malfunction of ASC-ECU
• Malfunction of AWC-ECU
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-23
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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 line (Refer to GROUP 54C
−
Troubleshooting
). After repairing the CAN
bus line, go to Step 2.
STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1078 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Check the tires
Check that the wheels/tires with the identical size are installed,
and that each tire pressure is within the value specified on the
tire pressure label.
Q: Is the check result normal?
YES : Go to Step 4.
NO : Install the wheels/tires with the identical size, or adjust
the tire pressure. Then go to Step 5.
STEP 4. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C
− Troubleshooting
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 5.
STEP 5. Scan tool service data
Check the following service data. (Refer to
.)
• Item No.22: FL wheel speed sensor <FL>
• Item No.23: FL wheel speed sensor <FR>
• Item No.24: FL wheel speed sensor <RL>
• Item No.25: FL wheel speed sensor <RR>
Q: Is the check result normal?
YES : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
NO : Replace the AWC-ECU.(Refer to
.)
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-24
DTC C1219: Steering Wheel Sensor System (Faulty Signal)
CAUTION
• If there is any problem in the CAN bus lines,
an incorrect 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,
calibrate the steering wheel sensor (refer to
GROUP 35C
− On-vehicle Service
and initialize the steering angle correction
amount stored in AWC-ECU. (Item No.09:
Steering angle correction amount initializa-
tion
• Do not drop the G and yaw rate sensor or sub-
ject it to a shock.
• When G and yaw rate sensor is replaced, cali-
brate G and yaw rate sensor (refer to GROUP
35C
− On-vehicle Service
), and ini-
tialize the lateral/longitudinal acceleration
correction amount stored in AWC-ECU. (Refer
to item No.10: Lateral acceleration correction
amount initialization, and No. 11: Longitudinal
acceleration correction amount initialization
.)
.
OPERATION
AWC-ECU receives steering wheel data from the
steering wheel sensor via CAN communication.
.
DTC SET CONDITIONS
This diagnostic trouble code is set when the abnor-
mality below is detected:
• The tolerance of neutral position of steering
wheel sensor exceeds the specified range.
• Abnormality in steering wheel sensor output
value
• Abnormality is detected by a comparison of out-
put value from the steering wheel sensor with the
output values from wheel speed sensor and G
and yaw rate sensor.
.
PROBABLE CAUSES
• Improper installation of steering wheel sensor
• Malfunction of steering wheel sensor
• Malfunction of G and yaw rate sensor
• Malfunction of wheel speed sensor
• Malfunction of AWC-ECU
• Vehicle straight-ahead position and steering
wheel neutral position is not matched.
DIAGNOSTIC PROCEDURE
STEP 1. Scan tool CAN bus diagnostics
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. Check whether the DTC is reset.
Q: Is DTC No. C1219 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Q: Is DTC No. C2205 set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
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