Mitsubishi Pajero Pinin. Manual - part 248

ABS <4WD> – 

Troubleshooting

35B-15

Inspection Procedure 2

Communication between MUT-

II

 and the ABS-ECU is not

possible.

Probable cause

The cause may be an open circuit in the ABS-ECU power supply circuit or an open
circuit in the diagnosis output circuit.

D

Blown fuse

D

Malfunction of wiring harness or connector

D

Malfunction of hydraulic unit and ABS-ECU

NG

NG

NG

Repair

NG

Check the harness wire, and repair if necessary.

D

Between ABS-ECU and diagnosis connector

OK

NG

Repair

NG

Check the harness wire, and repair if necessary.

D

Between ignition switch and ABS-ECU

OK

NG

Repair

NG

Check the harness wire, and repair if necessary.

D

Between ABS-ECU and earth

NG

Repair

NG

Replace the hydraulic unit and ABS-ECU.

OK

Check the trouble symp-
tom.

OK

Check the trouble symp-
tom.

OK

Check the following connector: A-58

Measure at the ABS-ECU connector A-58.

D

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

D

Continuity between 21 and body earth, and between 23 and
body earth
OK: Continuity

Check the following connector: A-58

OK

Check the trouble symp-
tom.

Measure at the ABS-ECU connector A-58.

D

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

D

Ignition switch: ON

D

Voltage between 10 and body earth
OK: System voltage

Check the following connectors: A-58, C-40 <R.H. drive
vehicles>, C-02 <R.H. drive vehicles>, C-78 <L.H. drive vehicles>,
C-76 <R.H. drive vehicles>, C-74

OK

Check the trouble symp-
tom.

Measure at the diagnosis connector C-35 and the ABS-ECU con-
nector A-58.

D

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

D

Continuity between the following terminals
ABS-ECU side – Diagnosis connector side

19 – 1

9 – 7

OK: Continuity

NG

Check the following connectors: A-58, C-28 <L.H. drive
vehicles>, C-40 <R.H. drive vehicles>, C-70, C-35

ABS <4WD> – 

Troubleshooting

35B-16

Inspection Procedure 3

When the ignition key is turned to “ON” (engine stopped),
the ABS warning lamp does not illuminate.

Probable cause

The cause may be an open circuit in the lamp power supply circuit, a blown lamp,
a malfunction of the ABS warning lamp relay or an open circuit between the ABS
warning lamp and the earth.

D

Blown fuse

D

Burn out ABS warning lamp bulb

D

Malfunction of ABS warning lamp relay

D

Malfunction of wiring harness or connector

D

Malfunction of hydraulic unit and ABS-ECU

NG

Repair

NG

OK

NG

Replace the ABS warning
lamp bulb.

NG

Check the harness wire.

D

Between ignition switch and combination meter

D

Between combination meter and ABS warning lamp relay

NG

Replace the ABS warning
lamp relay.

NG

Repair

OK

Replace the hydraulic unit and ABS-ECU.

NG

Check the harness wire, and repair if necessary.

D

Between ABS warning lamp relay and earth

OK

Check the trouble symp-
tom.

OK

Measure at the ABS warning lamp relay connector A-57.

D

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

D

Ignition switch: ON

D

Continuity between 1 and body earth
OK: Continuity

NG

Check the following connector: A-57

OK

Check the trouble symp-
tom.

OK

Check the following connectors: A-57,
 C-27 <L.H. drive vehicles>, C-40 <R.H. drive vehicles>, 
C-07, C-06, C-02 <L.H. drive vehicles>, C-76, C-74

OK

ABS warning lamp relay check (Refer to P.35B-23.)

Measure at the ABS warning lamp relay connector A-57.

D

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

D

Ignition switch: ON

D

ABS warning lamp condition when terminal 3 is earthed.
OK: Illuminates

Check whether the ABS warning lamp bulb is burnt out.

Fuse check
Multi-purpose fuse No.6

NG

Refer to GROUP 00 – Inspection Service Points for Blown Fuse.

NG

Repair

OK

Replace the combination meter.

ABS <4WD> – 

Troubleshooting

35B-17

Inspection Procedure 4

Even after the engine is started, the ABS warning lamp
remains illuminated.

Probable cause

The cause is probably a short-circuit in the ABS warning lamp illumination circuit.

D

Malfunction of combination meter

D

Malfunction of ABS warning lamp relay

D

Malfunction of wiring harness (short circuit)

D

Malfunction of hydraulic unit and ABS-ECU

NOTE
This trouble symptom is limited to cases where communication with the MUT-

II

 is possible (ABS-ECU

power supply is normal) and the diagnosis code is a normal diagnosis code.

OK

Replace the hydraulic unit and ABS-ECU.

NG

Repair

NG

Check the harness wire, and repair if necessary.

D

Between ABS warning lamp relay and ABS-ECU

OK

Check the trouble symp-
tom.

OK

Measure at the ABS-ECU connector A-58.

D

Ignition switch: ON

D

Voltage between 8 and body earth
OK: System voltage

YES

Check the following connectors: A-58, A-57

NO

ABS warning lamp relay check (Refer to P.35B-23.)

NG

Replace the ABS warning lamp relay.

Does the ABS warning lamp stay illuminated when the combination
meter connector C-07 is disconnected and the ignition switch
is turned to ON?

YES

Replace the combination meter.

Measure at the ABS warning lamp relay connector A-57.

D

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

D

Ignition switch: ON

D

Voltage between 5 and body earth
OK: System voltage

Does the ABS warning lamp stay illuminated when the ABS warning
lamp relay connector A-57 is disconnected and the ignition switch
is turned to ON?

NG

Repair

NG

Check the harness wire, and repair if necessary.

D

Between ignition switch and ABS warning lamp relay

OK

Check the trouble symp-
tom.

Check the following connector: A-57

NG

Check the harness wire, and repair if necessary.

D

Between combination meter and ABS warning lamp relay

NO

OK

NG

ABS <4WD> – 

Troubleshooting

35B-18

Inspection Procedure 5

Faulty ABS operation

Probable cause

This varies depending on the driving conditions and the road surface conditions,
so problem diagnosis is difficult. However, if a normal diagnosis code is displayed,
carry out the following inspection.

D

Improper installation of wheel speed sensor

D

Malfunction of wiring harness or connector

D

Malfunction of wheel speed sensor

D

Malfunction of ABS rotor

D

Foreign material adhering to wheel speed sensor

D

Malfunction of wheel bearing

D

Malfunction of hydraulic unit and ABS-ECU

NG

Replace the hydraulic unit and ABS-ECU.

OK

Check the trouble symptom.

OK

Check the following connector: A-58

NG

Measure at the ABS-ECU connector A-58.

D

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

D

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

Ω

(The sensor harness and connector should be moved while
these inspections are carried out.)

NG

OK

Check the trouble symptom.

OK

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

NG

Repair

OK

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

NG

Repair

OK

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

NG

Repair

NG

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

NG

Replace the wheel speed sensor.

OK

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

OK

Hydraulic unit check (Refer to P.35B-24.)

Wheel speed sensor installation check

NG

Repair

Check the harness wire.

D

Between each wheel speed sensor and ABS-ECU

NG

Repair