Mitsubishi Pajero Pinin. Manual — part 246
ABS <4WD> –
Troubleshooting
35B-7
When not using the MUT-
II
1.
Stop the engine.
2.
Use the special tool to earth terminal (1) (diagnosis control
terminal) of the diagnosis connector.
3.
Turn on the stop lamp switch. (Depress the brake pedal.)
4.
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
Within
1
second
Within
1
second
Within
1
second
Within
1
second
Within
1
second
Within
1
second
Within
1
second
Within
1
second
Within
1
second
1 second
Ignition switch
ON
LOCK (OFF)
Stop lamp switch
ON
OFF
ABS warning lamp
ON
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
11
Front right wheel speed sensor (Open circuit or short circuit)
35B-9
12
Front left wheel speed sensor (Open circuit or short circuit)
35B-9
13
Rear right wheel speed sensor (Open circuit or short circuit)
35B-9
14
Rear left wheel speed sensor (Open circuit or short circuit)
35B-9
15
Wheel speed sensor (Abnormal output signal)
35B-10
16*
ABS-ECU power supply system (Abnormal voltage drop or rise)
35B-11
21
Front right wheel speed sensor
35B-9
22
Front left wheel speed sensor
35B-9
23
Rear right wheel speed sensor
35B-9
24
Rear left wheel speed sensor
35B-9
32
G sensor system
35B-12
33
Stop lamp switch system
35B-13
41
Front right solenoid valve
The diagnosis codes are output
when there is no response to the
35B-13
42
Front left solenoid valve
when there is no response to the
drive signals for respective solenoid
valves or the ABS ECU power
43
Rear right solenoid valve
valves or the ABS-ECU power
supply system is defective.
44
Rear left solenoid valve
51
Valve relay problem (stays on)
35B-26, 27
(Replace the
hydraulic unit and
ABS-ECU.)
52
Valve relay problem (stays off) or ABS-ECU power supply system
problem
35B-13
53
Motor relay problem (stays off) or ABS-ECU power supply system
problem
54
Motor relay problem (stays on)
35B-26, 27
(Replace the
hydraulic unit and
ABS-ECU.)
55
Motor system (seized pump motor) or ABS-ECU power supply system
problem
35B-13
63
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.
D
Malfunction of wheel speed sensor
D
Malfunction of wiring harness or connector
D
Malfunction of hydraulic unit and ABS-ECU
Code Nos. 21, 22, 23 and 24 are output in the following cases.
D
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.
D
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.
D
Malfunction of wheel speed sensor
D
Malfunction of wiring harness or connector
D
Malfunction of ABS rotor
D
Too much gap between the sensor and the ABS rotor
D
Malfunction of hydraulic unit and ABS-ECU
D
Malfunction of wheel bearing
NG
Replace
OK
NG
Check the harness wire, and repair if necessary.
D
Between each wheel speed sensor and ABS-ECU
NG
Repair
OK
Wheel bearing check
(Refer to GROUP 26 and
GROUP 27 – On-vehicle
Service.)
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble symp-
tom.
Check the following connector: A-58
OK
ABS rotor check
(Refer to P.35B-30.)
NG
Replace
NG
Wheel speed sensor
check
(Refer to P.35B-30.)
NG
Replace
OK
Wheel speed sensor output voltage check (Refer to P.35B-22.)
OK
Check the trouble symp-
tom.
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
OK
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, 2 and 1, 4 and
5
OK: 1.30 – 1.58 k
Ω
NG
Wheel speed sensor check (Refer to P.35B-30.)
Wheel speed sensor installation check
NG
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).
D
Unequal tyre size
D
Improper installation of wheel speed sensor
D
Malfunction of wheel speed sensor
D
Malfunction of wiring harness or connector
D
Malfunction of ABS rotor
D
Malfunction of wheel bearing
D
Malfunction of hydraulic unit and ABS-ECU
NG
Replace
NG
Check the harness wire, and repair if necessary.
D
Between each wheel speed sensor and ABS-ECU
OK
YES
OK
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?
NO
NG
Repair
NG
Replace the hydraulic unit and ABS-ECU.
OK
Check the trouble symp-
tom.
Check the following connector: A-58
NG
Check the wheel speed sensor output voltage. (Refer to P.35B-22.)
Repair
NG
Check the ABS rotor. (Refer to P.35B-30.)
OK
Check the wheel speed sensor. (Refer to P.35B-30.)
Check the trouble symptom.
Check the wheel speed sensor installation condition.
NG
Equalize sizes on all tyres.
NG
OK
Replace
NG
Replace
OK
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