Mitsubishi Space Star. Manual — part 135
ABS <2WD> –
Troubleshooting
35B-5
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 2
Communication with MUT-
II
is not possible.
(Communication with ABS only is not possible.)
Probable cause
When communication with the MUT-
II
is not possible, the cause is probably an
open circuit in the ABS-ECU power circuit or an open circuit in the diagnosis output
circuit.
Blown fuse
Malfunction of wiring harness or connector
Malfunction of ABS-ECU
Measure at diagnosis connector B-35
and ABS-ECU connector A-47.
Disconnect the connector and
measure at the harness side.
Continuity between the following
terminals
OK: Continuity
ABS-ECU side
11
12
|
|
Diagnosis connector side
7
1
NG
Check the following connectors:
A-47, B-35, B-42, B-60X, B-61X
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness between the ABS-
ECU and diagnosis connector, and re-
pair if necessary.
OK
Measure at ABS-ECU connector A-47.
Disconnect the connector and
measure at the harness side.
Ignition switch: ON
Voltage between 15 – Body earth
OK: System voltage
NG
Check the following connectors:
A-47, B-42, B-80, B-77
NG
Repair
OK
Check trouble symptoms.
NG
Check the harness between fuse No.
5 inside the junction block and ABS-
ECU, and repair if necessary.
OK
Measure at ABS-ECU connector A-47.
Disconnect the connector and
measure at the harness side.
Continuity between
16, 19 – Body earth
OK: Continuity
NG
Repair
OK
Check the following connector:
A-47
NG
Repair
OK
Check trouble symptoms.
NG
Replace the hydraulic unit assembly.
ABS <2WD> –
Troubleshooting
35B-6
Inspection Procedure 5
Brake operation is abnormal.
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
Incorrect sensor harness contact
Foreign material adhering to wheel speed sensor
Malfunction of wheel speed sensor
Malfunction of ABS rotor
Malfunction of wheel bearing
Malfunction of hydraulic unit
Malfunction of ABS-ECU
Wheel speed sensor installation in-
spection
NG
Repair
OK
Wheel speed sensor output voltage
inspection (Refer to P.35B-8)
NG
Wheel speed sensor inspection
NG
Replace the wheel speed sensor.
OK
ABS rotor inspection
NG
Replace the ABS rotor.
OK
Wheel bearing inspection.
NG
Repair
OK
Check the following connectors:
A-22, A-02, B-42, D-15, D-14, D-12
NG
Repair
OK
Check trouble symptom.
NG
Measure at ABS-ECU connector A-47.
Disconnect the connector and
measure at the harness side.
Resistance value between terminals
1 – 2, 4 – 5, 6 – 7 and 8 – 9.
OK: 1.28 – 1.92 k
Ω
(The sensor harness and connector
should be moved while these
inspections are carried out.)
NG
Repair
OK
Check the following connector:
A-47
NG
Repair
OK
Check trouble symptom.
NG
Replace the hydraulic unit assembly.
OK
Hydraulic unit check
ABS <2WD> –
Troubleshooting
35B-7
CHECK AT ABS-ECU
TERMINAL VOLTAGE CHECK CHART
1.
Measure the voltages between terminals (16) and (19) (earth terminals) and each respective terminal.
2.
The terminal layouts are shown in the illustrations below.
Connector
terminal
No.
Signal
Checking requirements
Normal condition
11
MUT-
II
Connect the MUT-
II
.
Serial communication with
MUT-
II
Do not connect the MUT-
II
.
1 V or less
12
Input from diagnosis indica-
tion selection
Connect the MUT-
II
.
0 V
tion selection
Do not connect the MUT-
II
.
Approx. 12 V
14
Input from stop lamp switch
Ignition switch:
ON
Stop lamp switch: ON
System voltage
ON
Stop lamp switch: OFF
1 V or less
15
ABS-ECU power supply
Ignition switch: ON
System voltage
Ignition switch: START
0 V
17
Pump motor power supply
Always
System voltage
18
Solenoid valve power supply
Always
System voltage
20
Output to ABS warning lamp
Ignition switch:
ON
The lamp is switched off.
System voltage
ON
The lamp is illuminated.
0 – 2 V
ABS <2WD> –
Troubleshooting/On-vehicle Service
35B-8
RESISTANCE AND CONTINUITY BETWEEN HARNESS-SIDE CONNECTOR TERMINALS
1.
Turn the ignition switch off and disconnect the ABS-ECU connectors before checking resistance and
continuity.
2.
Check them between the terminals indicated in the table below.
3.
The terminal layouts are shown in the illustrations below.
Connector terminal No.
Signal
Normal condition
1 – 2
Rear-right wheel speed sensor (+ wire)
1.28 – 1.92 k
Ω
4 – 5
Front-right wheel speed sensor (+ wire)
1.28 – 1.92 k
Ω
6 – 7
Front-left wheel speed sensor (+ wire)
1.28 – 1.92 k
Ω
8 – 9
Rear-left wheel speed sensor (+ wire)
1.28 – 1.92 k
Ω
16 – Body earth
ABS-ECU earth
Continuity
19 – Body earth
ON-VEHICLE SERVICE
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
Measurement terminal No. has been changed. The same
procedures as before are applied except for the items shown
below.
Wheel
speed
sensor
Front left
Front right
Rear left
Rear right
Terminal
No
6
4
8
1
No.
7
5
9
2
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