Mitsubishi Outlander XL. Manual — part 620

STEP 7. Check of wheel speed detection encoder

ZC601558 0000

Magnetic
encoder

Rear hub
assembly

Rear wheel bearing

Ball bearing

Rear hub
assembly

Magnetic
encoder

<FWD>

<AWD>

Check the encoder for adhesion of foreign materials or
deformation.

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):

Replace the rear wheel hub assembly.

STEP 8. Voltage measurement at the A-01 ABS-ECU
connector

ZC601293 0020

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the harness-side connector, and then measure
the resistance at special tool connector side.

NOTE:

Do not connect the special tool MB991974 to ABS-

ECU.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor power
supply terminal (signal terminal) No. 24/the ground terminal
No. 25 and the body ground.

OK: 0 volt

Q:Is the check result normal?

YES:

Go to Step 9.

NO (Not normal at the terminal No. 24 or 25):

Go to Step

10.

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-43

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

STEP 9. Resistance measurement at A-01 ABS-ECU
connector

ZC601293 0021

Check harness

ABS-ECU

MB991974

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the harness-side connector, and then measure
the resistance at special tool connector side.

NOTE:

Do not connect the special tool MB991974 to ABS-

ECU.

(2)

Resistance between the wheel speed sensor power supply
terminal (signal terminal) No. 24/the ground terminal No. 25
and the body ground

OK: No continuity

Q:Is the check result normal?

YES:

Go to Step 11.

NO (Not normal at the terminal No. 24 or 25):

Go to Step

10.

STEP 10. Connector check: A-01 ABS-ECU connector,
C-129 intermediate connector, D-114 wheel speed sensor
<RL> connector

Q:Is the check result normal?

YES:

The short circuit in the wheel speed sensor <RL>

circuit may be present. Repair the wiring harness between
the A-01 ABS-ECU connector terminal No. 24/25 and the
D-114 wheel speed sensor <RL> connector terminal No. 1/2.

NO:

Repair the defective connector.

35B-44

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

STEP 11. Voltage measurement at the A-01 ABS-ECU
connector

ZC601292 0008

ABS-ECU

MB991974

Check harness

A-01 ABS-ECU
harness connector

(1)

Disconnect the ABS-ECU connector, connect special tool
MB991974 to the ABS-ECU-side connector and harness-
side connector, and then measure the voltage at the special
tool connector side.

(2)

Turn the ignition switch to the ON position.

(3)

Measure the voltage between the wheel speed sensor circuit
power supply terminal (signal terminal) No. 24 and the body
ground.

OK: Approximately battery voltage

Q:Is the check result normal?

YES:

Go to Step 13.

NO:

Go to Step 12.

STEP 12. Connector check: A-01 ABS-ECU connector,
C-129 intermediate connector, D-114 wheel speed sensor
<RL> connector

Q:Is the check result normal?

YES:

Replace the wheel speed sensor.

NO:

Repair the defective connector.

STEP 13. Wiring harness check between A-01 ABS-ECU
connector terminal No. 24/25 and D-114 wheel speed sensor
<RL> connector terminal No. 1/2

｠

Check for open circuit in wheel speed sensor <RL> circuit

Q:Is the check result normal?

YES:

Go to Step 14.

NO:

Repair the wiring harness.

STEP 14. Check whether the diagnostic trouble code is
reset.

(1)

Erase the diagnostic trouble code.

(2)

Drive the vehicle at 12mph (20 km/h) or more.

NOTE:

The ABS warning light does not turn OFF in some

cases unless the vehicle runs at 12mph (20 km/h) or
higher.

Q:Is DTC C1027 set?

YES:

Replace the ABS-ECU.

NO:

Intermittent malfunction. (Refer to GROUP 00 - How

to Cope with Intermittent Malfunction P.00-15.)

ANTI-LOCK BRAKING SYSTEM (ABS)

35B-45

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS

DTC C1032: Abnormality in RR wheel speed sensor signal

M13502000914USA0000010000

Wheel Speed Sensor Circuit

ABS-ECU

(LH)

(LH)

(RH)

(RH)

FRONT WHEEL SPEED SENSOR

REAR WHEEL SPEED SENSOR

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. (Refer to GROUP 54D, Trouble
code diagnosis P.54D-17).

CIRCUIT OPERATION

｠

The wheel speed sensor is a kind of a pulse generator. 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 ABS-ECU. ABS-ECU uses the frequency of the pulse
signals to determine the wheel speed.

DTC SET CONDITIONS
ABS-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, ABS-ECU will set the relevant diagnostic
trouble code.

｠

Irregular change in the wheel speed sensor signal

35B-46

ANTI-LOCK BRAKING SYSTEM (ABS)

ANTI-LOCK BRAKING SYSTEM (ABS) DIAGNOSIS