Mitsubishi Lancer Evolution X. Manual — part 489

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

TSB Revision

MANUAL TRANSAXLE

22A-49

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

P.54C-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1617 set?

YES : Go to Step 3.
NO : This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check if the AWC-related DTC No. U0100, U0101, U0121,
U0126, or U0141 is set.(Refer to

P.22A-12

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 4.

STEP 4. Scan tool diagnostic trouble code

• Check the engine diagnostic trouble code. (Refer to

GROUP 13A − Troubleshooting

P.13A-48

.)

• Check the ASC diagnostic trouble code. (Refer to GROUP

35C − Troubleshooting

P.35C-22

.)

• Check the ETACS diagnostic trouble code. (Refer to

GROUP 54A − Troubleshooting

P.54A-646

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 5.

STEP 5. Check whether the DTC is reset.
Q: Is DTC No. C1617 set?

YES : Replace the AWC-ECU.(Refer to

P.22A-133

.) Then

go to Step 6.

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 6. Check whether the DTC is reset.
Q: Is DTC No. C1613 set?

YES : Return to Step 1.
NO : This diagnosis is complete.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

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MANUAL TRANSAXLE

22A-50

DTC C1618: AWC CAN Local Data System (data not received)

.

G AND YAW RATE SENSOR POWER
SUPPLY

Refer to

P.22A-72

.

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.

• 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

P.35C-287

), and ini-

tialize the lateral/longitudinal acceleration
correction amount stored in AWC-ECU. (Refer
to item No.2: Lateral acceleration correction
amount initialization, and No.3: Longitudinal
acceleration correction amount initialization

P.22A-114

.)

.

OPERATION

AWC-ECU receives various data from ASC-ECU, G
and yaw rate sensor via the local CAN communica-
tion.

.

DTC SET CONDITIONS

The code is set when the signal necessary for AWC
control cannot be received.

.

PROBABLE CAUSES

• The CAN bus line is defective.
• Malfunction of local CAN bus line
• Malfunction of ASC-ECU
• Malfunction of G and yaw rate sensor
• 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

P.54C-15

.) After repairing the CAN

bus line, go to Step 2.

STEP 2. Check whether the DTC is reset.
Q: Is DTC No. C1618 set?

YES : Go to Step 3.
NO : This diagnosis is complete.

STEP 3. Scan tool diagnostic trouble code
Check if the AWC diagnostic trouble code No. U1003 is
set.(Refer to

P.22A-12

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 4.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

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MANUAL TRANSAXLE

22A-51

STEP 4. Scan tool diagnostic trouble code
Check the ASC diagnostic trouble code. (Refer to GROUP 35C
− Troubleshooting

P.35C-22

.)

Q: Is the DTC set?

YES : Perform the relevant troubleshooting.
NO : Go to Step 5.

STEP 5. ASC-ECU connector, G and yaw rate sensor
connector, AWC-ECU connector, intermediate connector,
J/C (7) check: A-05, C-38, C-46, C-47, C-50
Q: Is the check result normal?

YES : Go to Step 6.
NO : Repair the defective connector. Then go to Step 10.

STEP 6. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 9, 10 and C-38 G and yaw rate
sensor connector terminal No. 2, 3, and between C-46
AWC-ECU connector terminal No. 9, 10 and A-05 ASC-ECU
connector terminal No. 18, 19.
Check the wiring harness for open and short circuit (to ground,
to power supply, or line-to line).
Q: Is the check result normal?

YES : Go to Step 7.
NO : Repair the wiring harness. Then go to Step 9.

STEP 7. Scan tool service data
Check the following service data. (Refer to

P.22A-107

.)

• Item No. 26: Yaw rate sensor
• Item No. 29: Lateral G sensor
• Item No. 31: Longitudinal G sensor

Q: Is the check result normal?

YES : Go to Step 9.
NO : Go to Step 8.

STEP 8. Check the wiring harness between A-05 ASC-ECU
connector terminal No. 22 and C-38 G and yaw rate sensor
connector terminal No. 1, and between A-05 ASC-ECU
connector terminal No. 29 and C-38 G and yaw rate sensor
connector terminal No. 5.
Check the wiring harness for open or short circuit (short to
ground).
Q: Is the check result normal?

YES : Replace the G and yaw rate sensor. (Refer to

GROUP 35C − G and Yaw Rate Sensor

P.35C-304

.)

Then go to Step 9.

NO : Repair the wiring harness. Then go to Step 10.

DIAGNOSIS <S-AWC(SUPER ALL WHEEL CONTROL)>

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MANUAL TRANSAXLE

22A-52

STEP 9. Check whether the DTC is reset.
Q: Is DTC No. C1618 set?

YES : Replace the AWC-ECU.(Refer to

P.22A-133

.) Then

go to Step 10.

NO : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

.)

STEP 10. Check whether the DTC is reset.
Q: Is DTC No. C1618 set?

YES : Return to Step 1.
NO : This diagnosis is complete.

DTC C161C: ACD Proportioning Valve System (Malfunction)

AC902089

PROPOR-
TIONING
VALVE

FOR ACD
CONTROL

AWC-ECU

ACD proportioning valve system

AB

AC708950CG

Connector: C-46

AC708955

Connector: D-11

AO