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.