Mitsubishi Lancer Evolution X. Manual — part 492
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-61
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. C1622 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1622 set?
YES : Replace the AWC-ECU.(Refer to
.) Then
go to Step 5.
NO : This diagnosis is complete. (The clutch protection
activated in such driving or road condition as ACD
control is applied for a prolonged period.)
STEP 5. Check whether the DTC is reset.
Q: Is DTC No. C1622 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC C1623: Brake Controlled System (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 controls brakes for AYC control.
.
DTC SET CONDITIONS
The code is set when the AYC brake control oper-
ates for a prolonged period.
.
PROBABLE CAUSES
• Malfunction of AWC-ECU
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-62
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. C1623 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1623 set?
YES : Replace the AWC-ECU.(Refer to
.) 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.
Q: Is DTC No. C1623 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC C1624: AWC-ECU System (Internal 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 monitors the malfunction in the ECU.
.
DTC SET CONDITIONS
The code is set when a malfunction is found in
AWC-ECU.
.
PROBABLE CAUSES
• Malfunction of AWC-ECU
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-63
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. C1624 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Scan tool diagnostic trouble code
Check other AWC diagnostic trouble code.(Refer to
Q: Is the DTC set?
YES : Perform the relevant troubleshooting.
NO : Go to Step 4.
STEP 4. Check whether the DTC is reset.
Q: Is DTC No. C1624 set?
YES : Replace the AWC-ECU.(Refer to
.) 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.
Q: Is DTC No. C1624 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC C1625: AWC Pressure Sensor System (Abnormal Power Supply Voltage)
.
AWC PRESSURE SENSOR SYSTEM
CIRCUIT
Refer to
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 monitors the AWC pressure sensor
power supply voltage.
.
DTC SET CONDITIONS
The code is set when the power supply voltage to the
AWC pressure sensor is outside the specified value.
.
PROBABLE CAUSES
• AWC pressure sensor malfunction
• Damaged harness wires and connectors
• Malfunction of AWC-ECU
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-64
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. C1625 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. Voltage measurement at F-13 AWC pressure
sensor connector
(1) Disconnect the connector, and measure the voltage
between the terminal No. 1 and the body ground.
(2) Turn the ignition switch to the "ON" position.
OK: Approx. 5 V
Q: Is the check result normal?
YES : Go to Step 6.
NO : Go to Step 4.
STEP 4. AWC-ECU connector, AWC pressure sensor
connector check: C-46, F-13
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 8.
STEP 5. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 6 and F-13 AWC pressure sensor
connector terminal No. 1.
Check the power supply line for short or open circuit.
Q: Is the check result normal?
YES : Go to Step 6.
NO : Check D-11 intermediate connector. When no
problem is found, repair the wiring harness. Then go
to Step 8.
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