Mitsubishi Evolution X. Manual — part 346
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
22A-33
DTC C1611: AWC Pressure Sensor System (Low Voltage)
PRESSURE
SENSOR
S-AWC-ECU
AWC pressure sensor system circuit
AC708950CG
Connector: C-46
AC708955
Connector: D-11
AO
AC708970AS
Connector: F-13
F-13 (B)
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
22A-34
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 the electric pump by the informa-
tion from AWC pressure sensor.
.
DTC SET CONDITIONS
The code is set when AWC pressure sensor output
voltage is 0.2 V or less.
.
PROBABLE CAUSES
• AWC pressure sensor malfunction
• Damaged harness wires and connectors
• Malfunction of AWC-ECU
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. C1611 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
STEP 3. AWC-ECU connector, intermediate connector,
AWC pressure sensor connector check: C-46, D-11, F-13
Q: Is the check result normal?
YES : Go to Step 4.
NO : Repair the defective connector. Then go to Step 7.
STEP 4. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 7 and F-13 AWC pressure sensor
connector terminal No. 2.
Check the wiring harness for short circuit.
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the wiring harness. Then go to Step 7.
STEP 5. Scan tool service data
Item No. 87: Pressure sensor output voltage (Refer to service
data reference table
Q: Is the check result normal?
YES : Go to Step 6.
NO : Replace the hydraulic unit. (Refer to GROUP 27
−
Hydraulic Unit
.) Then go to Step 6.
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
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MANUAL TRANSAXLE
22A-35
STEP 6. Check whether the DTC is reset.
Q: Is DTC No. C1611 set?
YES : Replace the AWC-ECU.(Refer to
.) Then,
go to Step 7.
NO : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C1611 set?
YES : Return to Step 1.
NO : This diagnosis is complete.
DTC C1612: AWC Pressure Sensor System (High 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 controls the electric pump by the informa-
tion from AWC pressure sensor.
.
DTC SET CONDITIONS
The code is set when AWC pressure sensor output
voltage is 4.6 V or more.
.
PROBABLE CAUSES
• AWC pressure sensor malfunction
• Damaged harness wires and connectors
• Malfunction of AWC-ECU
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. C1612 set?
YES : Go to Step 3.
NO : This diagnosis is complete.
DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>
TSB Revision
MANUAL TRANSAXLE
22A-36
STEP 3. Scan tool diagnostic trouble code
Check if the AWC-related DTC No. C1625 is set.(Refer to
.)
Q: Is the DTC set?
YES : Perform the relevant troubleshooting. Then go to Step
NO : Go to Step 4.
STEP 4. AWC-ECU connector, intermediate connector,
AWC pressure sensor connector check: C-46, D-11, F-13
Q: Is the check result normal?
YES : Go to Step 5.
NO : Repair the defective connector. Then go to Step 9.
STEP 5. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 7 and F-13 AWC pressure sensor
connector terminal No. 2.
Check the wiring harness for open or short circuit (short to
power supply).
Q: Is the check result normal?
YES : Go to Step 6.
NO : Repair the wiring harness. Then go to Step 9.
STEP 6. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 8 and F-13 AWC pressure sensor
connector terminal No. 3.
Check the wiring harness for open circuit.
Q: Is the check result normal?
YES : Go to Step 7.
NO : Check D-11 intermediate connector. When no
problem is found, repair the wiring harness. Then go
to Step 9.
STEP 7. Scan tool service data
Item No. 87: Pressure sensor output voltage (Refer to service
data reference table
Q: Is the check result normal?
YES : Go to Step 8.
NO : Replace the hydraulic unit. (Refer to GROUP 27
−
Hydraulic Unit
.) Then go to Step 8.
STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1612 set?
YES : Replace the AWC-ECU.(Refer to
.) Then
go to Step 9.
NO : Intermittent malfunction. (Refer to GROUP 00
− How
to Cope with Intermittent Malfunction
.)
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