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Mitsubishi Pajero Pinin. Manual - part 246

ABS <4WD> –

Troubleshooting

35B-7

When not using the MUT-

Stop the engine.

Use the special tool to earth terminal (1) (diagnosis control
terminal) of the diagnosis connector.

Turn on the stop lamp switch. (Depress the brake pedal.)

After carrying out steps 1. to 3., turn the ignition switch
to ON. Within 3 seconds after turning the ignition switch
to ON, turn off the stop lamp switch (release the brake
pedal). Then, turn the stop lamp switch on and off a total
of 10 times.

NOTE
If the ABS-ECU function has been stopped because of
fail-safe operation, it will not be possible to erase the
diagnosis codes.

1st

2nd 3rd 4th 5th 6th

7th 8th 9th 10th

Within
1
second

1 second

Ignition switch

LOCK (OFF)

Stop lamp switch

OFF

ABS warning lamp

OFF

ABS-ECU memory

Within 3
seconds

Erasing of
ABS-ECU
diagnosis
codes
complete.

MB991529

ABS <4WD> –

Troubleshooting

35B-8

INSPECTION CHART FOR DIAGNOSIS CODES

Diagnosis code No.

Inspection item

Reference page

Front right wheel speed sensor (Open circuit or short circuit)

35B-9

Front left wheel speed sensor (Open circuit or short circuit)

35B-9

Rear right wheel speed sensor (Open circuit or short circuit)

35B-9

Rear left wheel speed sensor (Open circuit or short circuit)

35B-9

Wheel speed sensor (Abnormal output signal)

35B-10

16*

ABS-ECU power supply system (Abnormal voltage drop or rise)

35B-11

Front right wheel speed sensor

35B-9

Front left wheel speed sensor

35B-9

Rear right wheel speed sensor

35B-9

Rear left wheel speed sensor

35B-9

G sensor system

35B-12

Stop lamp switch system

35B-13

Front right solenoid valve

The diagnosis codes are output
when there is no response to the

35B-13

Front left solenoid valve

when there is no response to the
drive signals for respective solenoid
valves or the ABS ECU power

Rear right solenoid valve

valves or the ABS-ECU power
supply system is defective.

Rear left solenoid valve

Valve relay problem (stays on)

35B-26, 27
(Replace the
hydraulic unit and
ABS-ECU.)

Valve relay problem (stays off) or ABS-ECU power supply system
problem

35B-13

Motor relay problem (stays off) or ABS-ECU power supply system
problem

Motor relay problem (stays on)

35B-26, 27
(Replace the
hydraulic unit and
ABS-ECU.)

Motor system (seized pump motor) or ABS-ECU power supply system
problem

35B-13

ABS-ECU

35B-26, 27
(Replace the
hydraulic unit and
ABS-ECU.)

NOTE
*: Turning the ignition switch to ACC will erase the diagnosis code No.16.

ABS <4WD> –

Troubleshooting

35B-9

INSPECTION PROCEDURE FOR DIAGNOSIS CODES

Code Nos.11, 12, 13 and 14 Wheel speed sensor
(open circuit or short circuit)

Probable cause

Code Nos.21, 22, 23 and 24 Wheel speed sensor

Code Nos. 11, 12, 13 and 14 are output if the ABS-ECU detects an open circuit
or short-circuit in the (+) wire or (–) wire in any one of the four wheel speed sensors.

Malfunction of wheel speed sensor

Malfunction of wiring harness or connector

Malfunction of hydraulic unit and ABS-ECU

Code Nos. 21, 22, 23 and 24 are output in the following cases.

When there is no input from any one of the four wheel speed sensors when
travelling at several km/h or more, even though open circuit can not be verified.

When a chipped or blocked-up ABS rotor is detected and if the anti-lock system
operates continuously because a malfunctioning sensor or a warped ABS rotor
is causing sensor output to drop.

Malfunction of wheel speed sensor

Malfunction of wiring harness or connector

Malfunction of ABS rotor

Too much gap between the sensor and the ABS rotor

Malfunction of hydraulic unit and ABS-ECU

Malfunction of wheel bearing

Replace

Check the harness wire, and repair if necessary.

Between each wheel speed sensor and ABS-ECU

Repair

Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 – On-vehicle
Service.)

Repair

Replace the hydraulic unit and ABS-ECU.

Check the trouble symp-
tom.

Check the following connector: A-58

ABS rotor check
(Refer to P.35B-30.)

Replace

Wheel speed sensor
check
(Refer to P.35B-30.)

Replace

Wheel speed sensor output voltage check (Refer to P.35B-22.)

Check the trouble symp-
tom.

Check the following connectors:
A-58, C-25<L.H. drive vehicles>, C-24<R.H. drive vehicles>, A-24,
A-85, D-24, D-28

Measure at the ABS-ECU connector A-58.

Disconnect the connector, and measure at the harness side
connector.

Resistances between 17 and 18, 15 and 14, 2 and 1, 4 and
5
OK: 1.30 – 1.58 k

Ω

Wheel speed sensor check (Refer to P.35B-30.)

Wheel speed sensor installation check

Repair

ABS <4WD> –

Troubleshooting

35B-10

Code No.15 Wheel speed sensor (Abnormal output signal)

Probable cause

This code is output if the output signal of any wheel speed sensor is abnormal
(other than an open circuit or short circuit).

Unequal tyre size

Improper installation of wheel speed sensor

Malfunction of wheel speed sensor

Malfunction of wiring harness or connector

Malfunction of ABS rotor

Malfunction of wheel bearing

Malfunction of hydraulic unit and ABS-ECU

Replace

Check the harness wire, and repair if necessary.

Between each wheel speed sensor and ABS-ECU

YES

Check the trouble symp-
tom.

Check the wheel bearing. (Refer to GROUP 26 and GROUP
27 – On-vehicle Service.)

Are four tyres equal in size?

Repair

Replace the hydraulic unit and ABS-ECU.

Check the trouble symp-
tom.

Check the following connector: A-58

Check the wheel speed sensor output voltage. (Refer to P.35B-22.)

Repair

Check the ABS rotor. (Refer to P.35B-30.)

Check the wheel speed sensor. (Refer to P.35B-30.)

Check the trouble symptom.

Check the wheel speed sensor installation condition.

Equalize sizes on all tyres.

Replace

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