Mitsubishi Lancer Evolution X. Manual - part 494

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

TSB Revision

MANUAL TRANSAXLE

22A-69

STEP 9. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 12 and C-315 ETACS-ECU
connector terminal No.4.
Check the wiring harness for open or short circuit (short to
ground).
Q: Is the check result normal?

YES : Go to Step 10.
NO : Check C-41 intermediate connector, C-43 J/C (4),

C-103 J/C (3). When no problem is found, repair the
wiring harness. Then go to Step 14.

STEP 10. Scan tool service data
Item No. 43: Battery voltage (Refer to service data reference
table

P.22A-107

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

NO : Replace the ETACS-ECU. (Refer to GROUP 54A −

ETACS-ECU

P.54A-742

.) Then go to Step 14.

STEP 11. AWC-ECU connector check: C-46
Q: Is the check result normal?

YES : Go to Step 12.
NO : Repair the defective connector. Then go to Step 14.

STEP 12. Check the wiring harness between C-46
AWC-ECU connector terminal No. 13 and body ground.
Check the wiring harness for open circuit.
Q: Is the check result normal?

YES : Go to Step 13.
NO : Repair the wiring harness. Then go to Step 14.

STEP 13. Scan tool service data
Item No. 43: Battery voltage (Refer to service data reference
table

P.22A-107

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

NO : Replace the AWC-ECU.(Refer to

P.22A-133

.) Then

go to Step 14.

STEP 14. Check whether the DTC is reset.
Q: Is DTC No. C2100 set?

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

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

TSB Revision

MANUAL TRANSAXLE

22A-70

DTC C2101: Battery Voltage Malfunction (High Voltage)

BATTERY VOLTAGE SYSTEM CIRCUIT

Refer to

P.22A-66

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

The code is set when the AWC-ECU power supply
voltage and solenoid valve power supply voltage are
18 V or more.

PROBABLE CAUSES

• Loose battery terminal
• Defective battery
• Charging system failed
• Malfunction of the ETACS-ECU
• 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. C2101 set?

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

STEP 3. 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 4.

STEP 4. Battery terminal check
Check that the battery terminal is not loose.
Q: Is the check result normal?

YES : Go to Step 5.
NO : Securely install the battery terminal. Then go to Step

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.

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

TSB Revision

MANUAL TRANSAXLE

22A-71

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 12.

STEP 9. Check the wiring harness between C-46 AWC-ECU
connector terminal No. 12 and C-315 ETACS-ECU
connector terminal No.4.
Check the wiring harness for short circuit (short to power sup-
ply).
Q: Is the check result normal?

YES : Go to Step 10.
NO : Check C-41 intermediate connector, C-43 J/C (4),

C-103 J/C (3). When no problem is found, repair the
wiring harness. Then go to Step 12.

STEP 10. Scan tool service data
Item No. 43: Battery voltage (Refer to service data reference
table

P.22A-107

Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 − How

to Cope with Intermittent Malfunction

P.00-15

NO : Replace the ETACS-ECU. (Refer to GROUP 54A −

ETACS-ECU

P.54A-742

.) Then go to Step 12.