Mitsubishi Lancer Evolution VI. Manual — part 68
ABS –
Troubleshooting
35B-22
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1 <EVOLUTION-IV>
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
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 symp-
tom.
OK
Check the trouble symptom.
Measure at the diagnosis connector B-22.
D
Continuity between 4 and body earth, and between 5 and body
earth
OK: Continuity
NG
Check the following connectors: B-22, B-50
OK
NG
Check the harness wire, and repair if necessary.
D
Between power supply and diagnosis connector
OK
Check the trouble symp-
tom.
Measure at the diagnosis connector B-22.
D
Voltage between 16 and body earth
OK: System voltage
NG
Check the following connectors:
B-22, B-49, B-73, B-75
Inspection Procedure 1 <EVOLUTION-V, VI>
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
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 symp-
tom.
OK
Check the trouble symptom.
Measure at the diagnosis connector B-22.
D
Continuity between 4 and body earth, and between 5 and body
earth
OK: Continuity
NG
Check the following connectors: B-22, B-50
OK
NG
Check the harness wire, and repair if necessary.
D
Between power supply and diagnosis connector
OK
Check the trouble symp-
tom.
Measure at the diagnosis connector B-22.
D
Voltage between 16 and body earth
OK: System voltage
NG
Check the following connectors: B-22, B-80
ABS –
Troubleshooting
35B-23
Inspection Procedure 2 <EVOLUTION-IV>
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 ABS-ECU
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 ABS-ECU.
OK
Check the trouble symp-
tom.
OK
Check the trouble symp-
tom.
OK
Check the following connectors: B-24, B-25
Measure at the ABS-ECU connector terminals B-24 and B-25.
D
Disconnect the connector, and measure at the harness side
connector.
D
Continuity between 2 and body earth, between 31 and body
earth and between 39 and body earth
OK: Continuity
NG
Check the following connectors: B-24, B-25
OK
Check the trouble symp-
tom.
Measure at the ABS-ECU connector B-24.
D
Disconnect the connector, and measure at the harness side
connector.
D
Ignition switch: ON
D
Voltage between 26 and body earth
OK: System voltage
NG
Check the following connectors:
B-24, B-52, B-74, B-76
OK
Check the trouble symp-
tom.
Measure at the diagnosis connector B-22 and the ABS-ECU connec-
tor B-25.
D
Disconnect the connector, and measure at the harness side
connector.
D
Continuity between the following terminals
ABS-ECU side – Diagnosis connector side
33 – 1
41 – 7
OK: Continuity
NG
Check the following connectors:
B-22, B-25, B-32, B-65
ABS –
Troubleshooting
35B-24
Inspection Procedure 2 <EVOLUTION-V, VI>
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 ABS-ECU
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 ABS-ECU.
OK
Check the trouble symp-
tom.
OK
Check the trouble symp-
tom.
OK
Check the following connectors: B-24, B-25
Measure at the ABS-ECU connector terminals B-24 and B-25.
D
Disconnect the connector, and measure at the harness side
connector.
D
Continuity between 15 and body earth, between 25 and body
earth and between 42 and body earth
OK: Continuity
NG
Check the following connectors: B-24, B-25
OK
Check the trouble symp-
tom.
Measure at the ABS-ECU connector B-24.
D
Disconnect the connector, and measure at the harness side
connector.
D
Ignition switch: ON
D
Voltage between 13 and body earth
OK: System voltage
NG
Check the following connectors:
B-24, B-52, B-74, B-76
OK
Check the trouble symp-
tom.
Measure at the diagnosis connector B-22 and the ABS-ECU connec-
tor B-25.
D
Disconnect the connector, and measure at the harness side
connector.
D
Continuity between the following terminals
ABS-ECU side – Diagnosis connector side
47 – 1
36 – 7
OK: Continuity
NG
Check the following connectors:
B-22, B-25, B-32, B-65
ABS –
Troubleshooting
35B-25
Inspection Procedure 3
When the ignition key is turned to “ON” (engine stopped),
the ABS warning lamp does not illuminate.
Probable cause
The ABS-ECU turns the valve relay ON
→
OFF
→
ON for initial checking when
it is powered ON. Accordingly, the ABS warning lamp illuminates twice even if the
circuit between the ABS warning lamp and ABS-ECU is faulty.
The cause may be an open circuit in the lamp power supply circuit, a blown lamp,
an open circuit between the ABS warning lamp and ABS-ECU or between the ABS
warning lamp and the valve relay.
D
Blown fuse
D
Burn out ABS warning lamp bulb
D
Malfunction of wiring harness or connector
OK
Check the trouble symptom.
NG
Replace the combination meter.
OK
Check the following connectors:
B-08, B-09
NG
Repair
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D
Between ignition switch and ABS
warning lamp
OK
Check the trouble symptom.
NG
Check the harness wire, and repair
if necessary.
D
Between ABS warning lamp and
ABS-ECU
D
Between ABS warning lamp and
valve relay
OK
Check the following connectors:
A-76, B-09, B-52
NG
Repair
OK
Measure at the combination meter con-
nector B-09.
D
Disconnect the connector, and
measure at the combination meter
side connector.
D
Ignition switch: ON
D
ABS warning lamp condition when
terminal 12 is grounded.
OK: Illuminates
NG
Check whether the ABS warning lamp
bulb is burnt out.
NG
OK
Measure at the combination meter con-
nector B-08.
D
Disconnect the connector and
measure at the harness side
connector.
D
Ignition switch: ON
D
Voltage between 42 and body
ground
OK: System voltage
NG
Check the following connectors:
B-08, B-75, B-76
NG
Repair
Fuse check
General-purpose fuse No.4
NG
Refer to GROUP 00 – Inspection Ser-
vice Points for a Blown Fuse.
Replace the ABS warning lamp bulb.
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