Mitsubishi Pajero Pinin. Manual — part 255
ABS <4WD> –
Troubleshooting
35B-11
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.
Malfunction of combination meter
Malfunction of ABS warning lamp relay
Malfunction of wiring harness (short circuit)
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.
Between ABS warning lamp relay and ABS-ECU
OK
Check the trouble symp-
tom.
OK
Measure at the ABS-ECU connector A-58.
Ignition switch: ON
Voltage between 22 and body earth
OK: System voltage
YES
Check the following connectors: A-58, A-57
NO
ABS warning lamp relay check
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.
Disconnect the connector, and measure at the harness side
connector.
Ignition switch: ON
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.
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.
Between combination meter and ABS warning lamp relay
NO
OK
NG
ABS <4WD> –
Troubleshooting
35B-12
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.
Improper installation of wheel speed sensor
Malfunction of wiring harness or connector
Malfunction of wheel speed sensor
Malfunction of ABS rotor
Foreign material adhering to wheel speed sensor
Malfunction of wheel bearing
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.
Disconnect the connector, and measure at the harness side
connector.
Resistances between 26 and 27, 4 and 5, 24 and 23, 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
NG
Repair
NG
Wheel speed sensor check
NG
Replace the wheel speed sensor.
OK
Wheel speed sensor output voltage check (Refer to P.35B-14.)
OK
Hydraulic unit check
Wheel speed sensor installation check
NG
Repair
Check the harness wire.
Between each wheel speed sensor and ABS-ECU
NG
Repair
ABS <4WD> –
Troubleshooting
35B-13
CHECK AT ABS-ECU
TERMINAL VOLTAGE CHECK CHART
1.
Measure the voltages between the respective terminal
and earth.
2.
The terminal layout is shown in the illustration.
Terminal No.
Check item
Checking requirements
Normal condition
3
Stop lamp switch input
Ignition switch: ON
Stop lamp switch: ON
System voltage
Stop lamp switch: OFF
1 V or less
6
G sensor earth
Always
0 V
9
Input from G sensor
Ignition switch: ON
2.4 – 2.6 V
9
In ut from G sensor
Ignition switch: ON
Vehicle is horizontal
2.4 2.6 V
12
Solenoid valve power
supply
Always
System voltage
19
Diagnosis changeover
input
When the MUT-
II
is connected
0 V
input
When the MUT-
II
is not connected
Approx. 12 V
21
MUT-
II
When the MUT-
II
is connected
Serial communication
with MUT-
II
When the MUT-
II
is not connected
1 V or less
22
ABS warning lamp
relay transistor output
Ignition switch: ON
When the lamp is
switched off
2 V or less
When the lamp is illu-
minated
System voltage
32
ABS-ECU power
supply
Ignition switch: ON
System voltage
supply
Ignition switch: START
0 V
34
Motor power supply
Always
System voltage
RESISTANCE AND CONTINUITY BETWEEN
HARNESS-SIDE CONNECTOR TERMINALS
1.
Turn the ignition key to the LOCK (OFF) position.
2.
Disconnect the ABS-ECU connector.
3.
Check the resistance and continuity between the terminals
indicated in the table below.
4.
The terminal layout is shown in the illustration.
ABS <4WD> –
Troubleshooting/On-vehicle Service
35B-14
ABS-ECU terminal No.
Signal
Normal condition
1 – 2
Wheel speed sensor (rear left)
1.30 – 1.58 k
Ω
23 – 24
Wheel speed sensor (rear right)
4 – 5
Wheel speed sensor (front left)
26 – 27
Wheel speed sensor (front right)
11 – Body earth
Earth
Continuity
33 – Body earth
Earth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
1.
Lift up the vehicle and release the parking brake.
2.
Disconnect the ABS-ECU connector.
3.
Rotate the wheel to be measured at approximately 1/2–1
rotation per second, and check the output voltage using a
circuit tester or an oscilloscope.
Wheel speed
sensor
Front
left
Front
right
Rear left
Rear
right
Terminal No.
4
26
2
24
5
27
1
23
Output voltage
When measuring with a circuit tester:
42 mV or more
When measuring with an oscilloscope:
120 mV p-p or more
4.
The followings are suspected if the output voltage is lower
than the value described above. Check the wheel speed
sensor, and replace if necessary.
Too large clearance between the pole piece of the
wheel speed sensor and ABS rotor
Faulty wheel speed sensor
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст