Mitsubishi Outlander GS45X. Manual — part 412

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-75

OPERATION

• Each wheel speed detecting section is a kind of a pulse

generator. It consists of the encoder (plate on which the
north and south pole of magnet are arranged alternately) for
detecting the wheel speed, which rotates at the same speed
of the wheels, and the wheel speed sensor. This detecting
section outputs the frequency pulse signals in proportion to
the wheel speed.

• The pulse signals generated by the wheel speed detecting

section are sent to ASC-ECU. ASC-ECU uses the fre-
quency of the pulse signals to determine the wheel speed.

DTC 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 DTC.

• Missing wheel speed sensor signal

• Wheel speed sensor signal continuously indicates low

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

• Wheel bearing malfunction

• Deformation of the wheel speed detection encoder

• Adhesion of foreign materials on the wheel speed detection

encoder

• Malfunction of wheel speed sensor

• Improper installation of the wheel speed sensor

• ASC-ECU malfunction

• The number of poles on the Magnetic encoder for wheel

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

Past trouble

• When DTC 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 diag-
nosis procedures, refer to How to treat past trouble (Refer
to GROUP 00

− How to Use Troubleshooting/How to Treat

Past Trouble

P.00-17

• When DTC 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.

• Rotate only two wheels with drum tester

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-76

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

STEP 1. Using scan tool MB991958, diagnose the CAN bus
lines.
Use scan tool 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

P.54C-17

). On

completion, go to Step 2.

STEP 2. DTC recheck after resetting CAN bus lines
Q: Is DTC C1035 set?

YES : Go to Step 3.
NO : The procedure is complete.

STEP 3. Using scan tool MB991958, check the DTC
Check that the DTC C102B is also set.
Q: Is the DTC C102B also set?

YES : Perform the diagnosis for the DTC C102B (Refer to

P.35C-37

NO : Go to Step 4.

STEP 4. Check for wheel speed sensor <RR> installation
Check how the wheel speed sensor <RR> is installed (Discon-
nection of wheel speed sensor <RR>, loose mounting bolt,
etc.).
Q: Is the check result normal?

YES : Go to Step 5.
NO : Reinstall the wheel speed sensor <RR> correctly

(Refer to

P.35C-288

). Then go to Step 5.

STEP 5. Check for wheel speed sensor <RR> output
current
Refer to

P.35C-277

Q: Is the check result normal?

YES : Go to Step 6.
NO : Replace the wheel speed sensor <RR> (Refer to

P.35C-288

). Then go to Step 9.

DIAGNOSIS

TSB Revision

ACTIVE STABILITY CONTROL SYSTEM (ASC)

35C-77

STEP 6. Check for wheel bearing looseness
NOTE:

•

Loose wheel bearing may increase the gap between the
wheel speed sensor <RR> and the wheel speed detection
magnet encoder.

•

Check the Rear wheel hub assembly <RR (FWD)> (Refer to
GROUP 27A

−

Wheel Bearing Play Check

P.27A-6

•

Check the wheel bearing <RR (AWD)> for looseness (Refer
to GROUP 27B

−

Wheel Bearing Play Check

P.27B-17

Q: Is the check result normal?

YES : Go to Step 7.
NO (FWD) : Replace the rear wheel hub assembly <RR>

(Refer to GROUP 27A

− Rear Axle Hub Assembly

P.27A-8

). Then go to Step 10.

NO (AWD) : Replace the wheel bearing <RR> (Refer to

GROUP 27B

− Rear Axle Hub Assembly

P.27B-19

Then go to Step 10.

STEP 7. Check of wheel speed detection encoder
Check the encoder for adhesion of foreign materials or defor-
mation.
Q: Is the check result normal?

YES : Go to Step 8.
NO (Adhesion of foreign materials) : Remove the foreign

materials and clean the encoder so as not to disturb
the magnetization pattern on it while taking care of the
magnet, magnetic substance, and magnetic
attraction.

NO <Deformation (FWD)> : Replace the rear wheel hub

assembly <RR> (Refer to GROUP 27A

− Rear Axle

Hub Assembly

P.27A-8

). Then go to Step 10.

NO <Deformation (AWD)> : Replace the wheel bearing

<RR> (Refer to GROUP 27B

− Rear Axle Hub

Assembly

P.27B-19

). Then go to Step 10.