Mitsubishi Lancer Evolution 7. Manual — part 319
ABS <4WD> -
Troubleshooting
35B-15
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptoms
Inspection procedure
No.
Reference page
Communication between the MUT-II and the whole system is not
possible.
1
35B-16
Communication between the MUT-II and the ABS-ECU is not possible.
2
35B-17
When the ignition key is turned to “ON” (engine stopped), the ABS
warning lamp does not illuminate.
3
35B-18
Even after the engine is started, the ABS warning lamp remains
illuminated.
4
35B-18
In the inspection with MUT-II service data, the parking brake switch is not
turned ON or turn OFF.
5
35B-19
The neutral position learning of the steering wheel sensor is not finished.
6
35B-20
Faulty ABS operation
7
35B-21
Caution
1. If steering movements are made when driving at high speed, or when driving on road surfaces
with low frictional resistance, or when passing over bumps, the ABS may operate even though
sudden braking is not being applied. Because of this, when getting information from the customer,
check if the problem occurred while driving under such conditions as these.
2. During ABS operation, the brake pedal may vibrate or may not be able to be depressed. Such
phenomena are due to intermittent changes in hydraulic pressure inside the brake line to prevent
the wheels from locking and is not an abnormality.
ABS <4WD> -
Troubleshooting
35B-16
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Communication between the MUT-II and the whole system
is not possible.
Probable cause
The cause may be a malfunction of the power supply circuit or the earth circuit of
the diagnosis connector.
D
Malfunction of diagnosis connector
D
Malfunction of wiring harness or connector
NG
Repair
NG
Check the harness wire, and repair if necessary.
D
Between fusible link No.1 and diagnosis connector
OK
Check the trouble
symptom.
NG
Replace the MUT-II.
NG
Repair
NG
Check the harness wire, and repair if necessary.
D
Between diagnosis connector and earth
OK
Check the trouble
symptom.
OK
Check the trouble symptom.
Measure at the diagnosis connector C-22.
D
Continuity between 4 and body earth, and between 5 and body
earth
OK: Continuity
NG
Check the following connector: C-22
OK
Measure at the diagnosis connector C-22.
D
Voltage between 16 and body earth
OK: System voltage
NG
Check the following connectors:
C-22, C-35 <R.H. drive vehicles>, C-132, C-211, C-213
ABS <4WD> -
Troubleshooting
35B-17
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
OK
NG
NG
NG
Repair
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 (IG2) 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
symptom.
OK
Check the trouble
symptom.
OK
Check the following connector: B-123
Measure at the ABS-ECU connector B-123.
D
Disconnect the connector, and measure at the harness side
connector.
D
Continuity between 12 and body earth, and between 34 and
body earth
OK: Continuity
Check the following connector: B-123
OK
Check the trouble
symptom.
Measure at the ABS-ECU connector B-123.
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: B-123, C-128 <R.H. drive
vehicles>, C-130 <L.H. drive vehicles>, C-209, C-210
Check the trouble
symptom.
Measure at the diagnosis connector C-22 and the ABS-ECU
connector B-123.
D
Disconnect the connectors, and measure at the harness side
connectors.
D
Continuity between the following terminals
ABS-ECU side - Diagnosis connector side
5 - 1
2 - 7
OK: Continuity
NG
Check the following connectors:
B-123, C-22, C-26, C-28 <R.H. drive vehicles>, C-102 <L.H. drive
vehicles>, C-108, C-128 <R.H. drive vehicles>, C-130
ABS <4WD> -
Troubleshooting
35B-18
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,
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 combination meter
D
Malfunction of wiring harness or connector
D
Malfunction of hydraulic unit and ABS-ECU
NO
NG
Replace the ABS warning lamp bulb.
Check the harness wire.
D
Between combination meter and ABS-ECU
D
Between ignition switch (IG1) and combination meter
D
Between combination meter and earth
Replace the hydraulic unit and ABS-ECU.
OK
NG
OK
Check the following connectors:
B-123, C-01, C-29 <L.H. drive vehicles>, C-128, C-210, C-213
OK
Check whether the ABS warning lamp bulb is burnt out.
Does the ABS warning lamp illuminate when the ABS-ECU
connector B-123 is disconnected and the ignition switch is turned
to ON?
YES
Repair
Replace the combination meter. (Refer to GROUP 54A.)
NG
Repair
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 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.
YES
NG
Check the harness wire.
D
Between combination meter and ABS-ECU
Replace the hydraulic unit and ABS-ECU.
OK
NG
OK
Check the trouble symptom.
Does the ABS warning lamp stay illuminated when the ABS-ECU
connector B-123 is disconnected and the ignition switch is turned
to ON?
NO
Repair
Replace the combination meter. (Refer to GROUP 54A.)
NG
Repair
Check the following connectors: B-123, C-01, C-128
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