Mitsubishi Evolution X. Manual - part 364

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

TSB Revision

MANUAL TRANSAXLE

22A-105

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-14

.) After repairing the CAN 

bus line, go to Step 2.

STEP 2. Retest the system.
Q: Is the check result normal?

YES : Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

NO :  Go to Step 3.

STEP 3. 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 6.
NO :  Go to Step 4.

STEP 4. AWC-ECU connector, ETACS-ECU connector 
check: C-46, C-315
Q: Is the check result normal?

YES : Go to Step 5.
NO :  Repair the defective connector. Then go to Step 13.

STEP 5. 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 circuit.
Q: Is the check result normal?

YES : Go to Step 12.
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 6. Voltage measurement at C-46 AWC-ECU 
connector
(1) With C-46 AWC-ECU connector connected, measure the 

voltage between the terminal No. 16 and the body ground.

(2) Turn the ignition switch to the "ON" position.

OK: Battery positive voltage

Q: Is the check result normal?

YES : Go to Step 9.
NO :  Go to Step 7.

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

TSB Revision

MANUAL TRANSAXLE

22A-106

STEP 7. AWC-ECU connector, ETACS-ECU connector 
check: C-46, C-313
Q: Is the check result normal?

YES : Go to Step 8.
NO :  Repair the defective connector. Then go to Step 13.

STEP 8. Check the wiring harness between C-46 AWC-ECU 
connector terminal No. 16 and C-313 ETACS-ECU 
connector terminal No. 2.
Check the wiring harness for open circuit.
Q: Is the check result normal?

YES : Go to Step 12.
NO :  Check D-27 J/C (5). When no problem is found, repair 

the wiring harness. Then go to Step 12.

STEP 9. AWC-ECU connector check: C-46
Q: Is the check result normal?

YES : Go to Step 10.
NO :  Repair the defective connector. Then go to Step 13.

STEP 10. 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 11.
NO :  Repair the wiring harness. Then go to Step 13.

STEP 11. 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-132

.) Then 

go to Step 13.

STEP 12. Retest the system.
Q: Is the check result normal?

YES : Replace the ETACS-ECU. (Refer to GROUP 54A 

− 

ETACS-ECU 

P.54A-676

.) Then go to Step 13.

NO :  Intermittent malfunction. (Refer to GROUP 00 

− How 

to Cope with Intermittent Malfunction 

P.00-15

.)

STEP 13. Retest the system.
Q: Is the check result normal?

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

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

TSB Revision

MANUAL TRANSAXLE

22A-107

DATA LIST REFERENCE TABLE

M1221011200087

Item 
No.

Display on scan tool Item name

Check conditions

Normal 
conditions

1

AWC control mode

AWC control mode

TARMAC is selected (displayed 
on multi information display).

TARMAC

GRAVEL is selected (displayed 
on multi information display).

GRAVEL

SNOW is selected (displayed on 
multi information display).

SNOW

2

T/M gear position 
hold request

T/M shift range storing 
request flag

Perform a test 
run of the 
vehicle.

Retention 
requested

ON

Retention not 
requested

OFF

3

System fail

System malfunction

Normal

Correct

Faulty

Malfunction

4

ACD target torque (for 
Meter)

ACD target torque 
(Meter display)

Perform a test run of the vehicle. 0 

− 5 seg

5

Request Yaw moment 
(for Meter)

Requested yaw moment 
(Meter display)

Perform a test run of the vehicle. -5 ~ 5 seg

6

FL brake control 
indication

Brake control instruction 
<FL>

Perform a test 
run of the 
vehicle.

Not requested

Not requested

Brake pressure 
command

Brake 
pressure

Slip ratio 
command

Slip ratio

Brake pressure 
and slip ratio 
command

Brake 
pressure and 
slip ratio

7

FR brake control 
indication

Brake control instruction 
<FR>

Perform a test 
run of the 
vehicle.

Not requested

Not requested

Brake pressure 
command

Brake 
pressure

Slip ratio 
command

Slip ratio

Brake pressure 
and slip ratio 
command

Brake 
pressure and 
slip ratio

8

RL brake control 
indication

Brake control instruction 
<RL>

Perform a test 
run of the 
vehicle.

Not requested

Not requested

Brake pressure 
command

Brake 
pressure

Slip ratio 
command

Slip ratio

Brake pressure 
and slip ratio 
command

Brake 
pressure and 
slip ratio

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

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MANUAL TRANSAXLE

22A-108

9

RR brake control 
indication

Brake control instruction 
<RR>

Perform a test 
run of the 
vehicle.

Not requested

Not requested

Brake pressure 
command

Brake 
pressure

Slip ratio 
command

Slip ratio

Brake pressure 
and slip ratio 
command

Brake 
pressure and 
slip ratio

10

Rear ABS control 
request status

Rear ABS independent 
control request

Perform a test 
run of the 
vehicle.

Not requested

Not requested

Independent 
control

Independent 
control

Select low

Select low

Error

Malfunction

11

Steering angle sensor Steering wheel sensor

Steering wheel: Steered 90

°  to 

right

R90 deg

Steering wheel: Steered 90

°  to 

left

L90 deg

12

Steering angle speed Steering wheel steering 

angle speed

Steering wheel: Without steering 
wheel operation

0 deg/s

Steering wheel: With steering 
wheel operation

Changes 
depending on 
the turning 
speed.

13

Steering angle sensor 
(status)

Steering wheel sensor 
(status)

Normal

Correct

Faulty

Malfunction

Neutral point not learned

Neutral not 
learned

Neutral point not learned or failed Neutral not 

learned and 
Malfunction

14

Accelerator position

Accelerator opening 
angle

Release the accelerator pedal

18~22%

Depress the accelerator pedal

Increases in 
response to 
the depression 
amount

Accelerator pedal fully opened

80% or more

15

Engine speed

Engine speed

Idling and test run

Nearly the 
same as the 
tachometer 
display

16

Engine torque (Driver 
request)

Engine torque (Driver 
request value)

Operate the accelerator pedal

The torque 
changes

Item 
No.

Display on scan tool Item name

Check conditions

Normal 
conditions