Mitsubishi Outlander (2013+). Manual - part 461

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-19

Code No.C100A is set

• Measure the voltage between the ASC-ECU 

connector (FL+ terminal) and the body earth, 
and between the ASC-ECU connector (FL- 
terminal) and the body earth.

OK: 1 V or less

Code No.C1015 is set

• Measure the voltage between the ASC-ECU 

connector (FR+ terminal) and the body earth, 
and between the ASC-ECU connector (FR- 
terminal) and the body earth.

OK: 1 V or less

Code No.C1020 is set

• Measure the voltage between the ASC-ECU 

connector (RL+ terminal) and the body earth, 
and between the ASC-ECU connector (RL- 
terminal) and the body earth.

OK: 1 V or less

Code No.C102B is set

• Measure the voltage between the ASC-ECU 

connector (RR+ terminal) and the body earth, 
and between the ASC-ECU connector (RR- 
terminal) and the body earth.

OK: 1 V or less

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 6.

STEP 5. Resistance measurement at ASC-ECU 
connector (FL+, FL-, FR+, FR-, RL+, RL-, RR+, 
RR- terminal)
Disconnect the connector, and measure at the wiring 
harness side.

Code No.C100A is set

• Measure the resistance between the ASC-ECU 

connector (FL+ terminal) and the body earth, and 
between the ASC-ECU connector (FL- terminal) 
and the body earth.

OK: No continuity

Code No.C1015 is set

• Measure the resistance between the ASC-ECU 

connector (FR+ terminal) and the body earth, and 
between the ASC-ECU connector (FR- terminal) 
and the body earth.

OK: No continuity

Code No.C1020 is set

• Measure the resistance between the ASC-ECU 

connector (RL+ terminal) and the body earth, and 
between the ASC-ECU connector (RL- terminal) 
and the body earth.

OK: No continuity

Code No.C102B is set

• Measure the resistance between the ASC-ECU 

connector (RR+ terminal) and the body earth, 
and between the ASC-ECU connector (RR- ter-
minal) and the body earth.

OK: No continuity

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

STEP 6. Check the wiring harness between the 
ASC-ECU connector terminal and the wheel 
speed sensor connector terminal.

Code No.C100A is set

• Check of short circuit in FL+, FL- line between 

ASC-ECU connector and front wheel speed sen-
sor (LH) connector.

Code No.C1015 is set

• Check of short circuit in FR+, FR- line between 

ASC-ECU connector and front wheel speed sen-
sor (RH) connector.

Code No.C1020 is set

• Check of short circuit in RL+, RL- line between 

ASC-ECU connector and rear wheel speed sen-
sor (LH) connector.

Code No.C102B is set

• Check of short circuit in RR+, RR- line between 

ASC-ECU connector and rear wheel speed sen-
sor (LH) connector.

Q: Is the check result normal?

YES : 

Replace the wheel speed sensor (Refer to 

P.35C-97

 <front> or 

P.35C-97

 <rear>). 

Then go to Step 11.

NO : 

Repair the connector(s) or wiring harness. 
Then go to Step 11.

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-20

STEP 7. Resistance measurement at the 
ASC-ECU connector (FL+, FL-, FR+, FR-, RL+, 
RL-, RR+, RR- terminal)
Disconnect the connector, and measure at the wiring 
harness side.

Code No.C100A is set

• Measure the resistance between the ASC-ECU 

connector (FL+ terminal) and the ASC-ECU con-
nector (FL- terminal).

OK: Continuity

Code No.C1015 is set

• Measure the resistance between the ASC-ECU 

connector (FR+ terminal) and the ASC-ECU con-
nector (FR- terminal).

OK: Continuity

Code No.C1020 is set

• Measure the resistance between the ASC-ECU 

connector (RL+ terminal) and the ASC-ECU con-
nector (RL- terminal).

OK: Continuity

Code No.C102B is set

• Measure the resistance between the ASC-ECU 

connector (RR+ terminal) and the ASC-ECU con-
nector (RR- terminal).

OK: Continuity

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 10.

STEP 8. Check the wiring harness between the 
ASC-ECU connector terminal and the wheel 
speed sensor connector terminal

Code No.C100A is set

• Check of open circuit in FL+, FL- line between 

ASC-ECU connector and front wheel speed sen-
sor (LH) connector.

Code No.C1015 is set

• Check of open circuit in FR+, FR- line between 

ASC-ECU connector and front wheel speed sen-
sor (RH) connector.

Code No.C1020 is set

• Check of open circuit in RL+, RL- line between 

ASC-ECU connector and rear wheel speed sen-
sor (LH) connector.

Code No.C102B is set

• Check of open circuit in RR+, RR- line between 

ASC-ECU connector and rear wheel speed sen-
sor (RH) connector.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the connector(s) or wiring harness. 
Then go to Step 11.

STEP 9. Check for wheel speed sensor as a 
single unit
Refer to 

P.35C-97

.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the wheel speed sensor (Refer to 

P.35C-97

 <front> or 

P.35C-97

 <rear>). 

Then go to Step 11.

STEP 10. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 20 km/h 
or higher.

Q: Is diagnosis code No. C100A, 1015, 1020 or 102B 

set?
YES : 

Replace the hydraulic unit (integrated with 

ASC-ECU) (Refer to 

P.35C-95

). Then go to 

Step 11.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/How to 

Cope with Intermittent Malfunctions ).

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-21

STEP 11. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Drive the vehicle at 20 km/h or higher.

NOTE: The ABS warning lamp does not turn OFF 
in some cases unless the vehicle runs at 20 km/h 
or higher.

Q: Is diagnosis code No. C100A, 1015, 1020 or 102B 

set?
YES : 

Return to Step 1.

NO : 

This diagnosis is complete.

Code No. C1011 FL wheel speed sensor signal

 

Code No. C101C FR wheel speed sensor signal

 

Code No. C1027 RL wheel speed sensor signal

 

Code No. C1032 RR wheel speed sensor signal

CAUTION

• If there is any problem in the CAN bus lines, 

an incorrect diagnosis code may be set. Prior 
to this diagnosis, diagnose the CAN bus lines 
(Refer to GROUP 54C 

− CAN Bus Diagnostics 

Table ).

• Whenever ECU is replaced, ensure that the 

CAN bus lines are normal.

• When the hydraulic unit (integrated with 

ASC-ECU) is replaced, always carry out the 
calibration of the steering wheel sensor, the G 
and yaw rate sensor and brake fluid pressure 
sensor (Refer to 

P.35C-93

, 

P.35C-94

 and 

P.35C-94

).

OPERATION

• The wheel speed sensor is a kind of a pulse gen-

erator. It consists of encoders (a plate on which 
north and south pole sides of the magnets are 
arranged alternately) for detecting the wheel 
speed which rotates at the same speed of the 
wheels and wheel speed sensors. This sensor 
outputs frequency pulse signals in proportion to 
the wheel speed.

• The pulse signals, which the wheel speed sensor 

creates, are sent to ASC-ECU. ASC-ECU uses 
the frequency of the pulse signals to determine 
the wheel speed.

DIAGNOSIS CODE SET CONDITIONS

ASC-ECU monitors the signals from each wheel 
speed sensor while the vehicle is being driven. If any 
fault below is found in these sensor signals, 
ASC-ECU will set the relevant diagnosis code.

• Irregular change in the wheel speed sensor sig-

nal

• Wheel speed sensor signal continuously indi-

cates high value.

PROBABLE CAUSES

Current trouble

• Excessive gap between the wheel speed sensor 

and the wheel speed detection encoder

• Adhesion of foreign materials on the wheel speed 

sensor

• Adhesion of foreign materials on the wheel speed 

detection encoder

• Wheel bearing malfunction

• Malfunction of wheel speed sensor

• Damaged wiring harness and connectors

• External noise interference

• Improper installation of the wheel speed sensor

• Deformation of the wheel speed detection 

encoder

• ASC-ECU malfunction

• Disturbance of magnetisation pattern for wheel 

speed detection encoder

• The number of poles on the Magnetic encoder for 

wheel speed detection (N-pole and S-pole) is 
changed

Past trouble

• When diagnosis code No.C100A, C1015, C1020 

or C102B is also set, carry out diagnosis with par-
ticular emphasis on wiring harness and connector 
failures between ASC-ECU and the wheel speed 
sensor. For diagnosis procedures, refer to How to 
treat past trouble (GROUP 00 

− How to Use 

Troubleshooting/How to Treat Past Trouble ).

• When diagnosis code No.C100A, C1015, C1020 

or C102B is not set, the following conditions may 
be present:

• Some wheels slip

• Unstable vehicle attitude

• External noise interference

• Vehicle ran with the parking brake applied

TROUBLESHOOTING

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-22

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnosis
Use M.U.T.-III to 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 

− CAN Bus Diagnostics Table ). On 

completion, go to Step 2.

STEP 2. Diagnosis code recheck after resetting 
CAN bus lines

Q: Is the diagnosis code No.C1011, C101C, C1027 or 

C1032 set?
YES : 

Go to Step 3.

NO : 

This diagnosis is complete.

STEP 3. M.U.T.-III diagnosis code
Check that diagnosis code No.C100A, C1015, 
C1020 or C102B is also set.

Q: Is diagnosis code No.C100A, C1015, C1020 or 

C102B also set?
YES : 

Perform the diagnosis for diagnosis code 

No.C100A, C1015, C1020 or C102B (Refer 
to 

P.35C-18

).

NO : 

Go to Step 4.

STEP 4. Check the wiring harness between the 
ASC-ECU connector terminal and the wheel 
speed sensor connector terminal

Code No.C1011 is set

• Check of short to power supply, short to earth, 

and open circuit in FL+, FL

− line between 

ASC-ECU connector and front wheel speed sen-
sor (LH) connector.

Code No.C101C is set

• Check of short to power supply, short to earth, 

and open circuit in FR+, FR

− line between 

ASC-ECU connector and front wheel speed sen-
sor (RH) connector.

Code No.C1027 is set

• Check of short to power supply, short to earth, 

and open circuit in RL+, RL

− line between 

ASC-ECU connector and rear wheel speed sen-
sor (LH) connector.

Code No.C1032 is set

• Check of short to power supply, short to earth, 

and open circuit in RR+, RR

− line between 

ASC-ECU connector and rear wheel speed sen-
sor (RH) connector.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector(s) or wiring harness. 
Then go to Step 11.

STEP 5. Check for wheel speed sensor 
installation
Check how the  wheel speed sensor is installed (Dis-
connection of wheel speed sensor, loose mounting 
bolt, etc.).

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Reinstall the wheel speed sensor correctly 
(Refer to 

P.35C-97

 <front> or 

P.35C-97

 

<rear>). Then go to Step 6.

STEP 6. Check for wheel speed sensor output 
current
Refer to 

P.35C-90

.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the wheel speed sensor (Refer to 

P.35C-97

 <front> or 

P.35C-97

 <rear>). 

Then go to Step 10.