Mitsubishi Lancer Evolution X. Manual - part 493

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

TSB Revision

MANUAL TRANSAXLE

22A-65

STEP 6. Scan tool service data
Item No. 86: Pressure sensor power supply voltage (Refer to 
service data reference table 

P.22A-107

.)

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Replace the hydraulic unit. (Refer to GROUP 27 − 

Hydraulic Unit 

P.27-57

.) Then go to Step 7.

STEP 7. Check whether the DTC is reset.
Q: Is DTC No. C1625 set?

YES : Replace the AWC-ECU.(Refer to 

P.22A-133

.) Then 

go to Step 8.

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

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 8. Check whether the DTC is reset.
Q: Is DTC No. C1625 set?

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

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

TSB Revision

MANUAL TRANSAXLE

22A-66

DTC C2100: Battery Voltage Malfunction (Low Voltage)

AC902091

ETACS-ECU

IGNITION
SWITCH (IG1)

FUSIBLE
LINK

34

IG1 
RELAY

JOINT
CONNECTOR 
(3)

JOINT
CONNECTOR 
(5)

JOINT
CONNECTOR 
(4)

POWER 
SUPPLY

AWC-ECU

Power supply system circuit

AB

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

TSB Revision

MANUAL TRANSAXLE

22A-67

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 power supply is provided from the battery 
via ETACS-ECU.

.

DTC SET CONDITIONS

This diagnostic trouble code is set when the abnor-
mality below is detected:

• When the AWC-ECU power supply voltage and 

solenoid valve power supply voltage are 9 V or 
less.

• When ASC-ECU low voltage is detected.

.

PROBABLE CAUSES

• Malfunction of ASC-ECU
• Malfunction of the ETACS-ECU
• Defective battery
• Charging system failed
• 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 

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. C2100 set?

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

AC708950CJ

C-41

C-46

C-43 (B)

Connectors: C-41, C-43, C-46

AC708950

Connector: C-103

BO

C-103 (B)

AC708972BJ

Connectors: C-309, C-313, C-315, C-317

ETACS-ECU

C-315

C-317

C-309 (B)

C-313 (BR)

AC708955AZ

D-27 (B)

Connector: D-27

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

TSB Revision

MANUAL TRANSAXLE

22A-68

STEP 3. 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 4.

STEP 4. Scan tool diagnostic trouble code
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 the battery.
Refer to GROUP 54A − Battery Test 

P.54A-9

.

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Charge or replace the battery. Then go to Step 6.

STEP 6. Check the charging system.
Refer to GROUP 16 − Charging System 

P.16-7

.

Q: Is the check result normal?

YES : Go to Step 7.
NO :  Repair or replace the charging system component(s).

STEP 7. Voltage measurement at C-46 AWC-ECU 
connector
Measure the voltage between C-46 AWC-ECU connector ter-
minal No.12 − and the body ground.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 11.
NO :  Go to Step 8.

STEP 8. AWC-ECU connector, ETACS-ECU connector 
check: C-46, C-315
Q: Is the check result normal?

YES : Go to Step 9.
NO :  Repair the defective connector. Then go to Step 14.