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)>

TSB Revision

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