Mitsubishi Lancer Evolution VI. Manual - part 66

ABS  – 

Troubleshooting

35B-14

<EVOLUTION-IV>

Code No.33 Stop lamp switch system (open circuit or stop
lamp stays ON)

Probable cause

This code is output, if the stop lamp switch is continuously on for 15 minutes or
more.

D

Malfunction of stop lamp switch

D

Malfunction of wiring harness or connector

D

Malfunction of ABS-ECU

OK

Check the trouble symptom.

NG

Check the harness wire, and repair
if necessary.

D

Between dedicated fuse No. 11
and ABS-ECU

OK

Check the trouble symptom.

NG

Replace the ABS-ECU.

OK

Check the trouble symptom.

NG

Check the harness wire, and repair
if necessary.

D

Between stop lamp switch and
ABS-ECU

OK

Check the following connectors:
B-15, B-21, B-25, B-32, B-65

NG

Repair

OK

Check the following connector:
B-25

NG

Repair

YES

Measure at the ABS-ECU connector
B-25.

D

Disconnect the connector, and
measure at the harness side
connector.

D

Stop lamp switch: ON

D

Voltage between 40 and body
ground
OK: System voltage

NG

Check the following connectors:
B-25, B-32, B-65

NG

Repair

OK

Stop lamp switch check

NG

Replace

Does the stop lamp turn on and off
normally?

NO

Stop lamp switch installation check

NG

Repair

ABS  – 

Troubleshooting

35B-15

<EVOLUTION-V, VI>

Code No.33 Stop lamp switch system (open circuit or stop
lamp stays ON)

Probable cause

This code is output, if the stop lamp switch is continuously on for 15 minutes or
more.

D

Malfunction of stop lamp switch

D

Malfunction of wiring harness or connector

D

Malfunction of ABS-ECU

OK

Check the trouble symptom.

NG

Check the harness wire, and repair
if necessary.

D

Between dedicated fuse No. 11
and ABS-ECU

OK

Check the trouble symptom.

NG

Replace the ABS-ECU.

OK

Check the trouble symptom.

NG

Check the harness wire, and repair
if necessary.

D

Between stop lamp switch and
ABS-ECU

OK

Check the following connectors:
B-15, B-21, B-25, B-32, B-65

NG

Repair

OK

Check the following connector:
B-25

NG

Repair

YES

Measure at the ABS-ECU connector
B-25.

D

Disconnect the connector, and
measure at the harness side
connector.

D

Stop lamp switch: ON

D

Voltage between 34 and body
ground
OK: System voltage

NG

Check the following connectors:
B-25, B-32, B-65

NG

Repair

OK

Stop lamp switch check

NG

Replace

Does the stop lamp turn on and off
normally?

NO

Stop lamp switch installation check

NG

Repair

Code No. 41, 42, 43, 44: Solenoid valve system

Probable cause

ABS-ECU monitors the solenoid valve energization circuit at all times. This code is
output when no current flows through the solenoid even when ABS-ECU energizes
it or when current continues flowing through the solenoid even when ABS-ECU
deenergizes it, which is considered to be attributable to an open- or short-circuited
solenoid coil or open- or short-circuited harness.

D

Defective hydraulic unit

D

Defective harness or connector

D

Defective ABS-ECU

OK

Replace the ABS-ECU.

OK

Check the trouble symptom.

NG

Check the harness between hydraulic
unit (solenoid valve) and ABS-ECU.

NG

Repair

OK

Check the trouble symptom.

NG

Check and repair the harness between
hydraulic unit and valve relay.

OK

Check the following connectors:
A-21, B-24, B-25

NG

Repair

OK

Measure at A-22 hydraulic unit connec-
tor and A-76 valve relay connector.

D

Disconnect the connector and
measure at the harness side.

D

Continuity across the following
terminals

Hydraulic

Valve relay

unit side

side

11

–

3

OK: Conducting

NG

Check the following connectors:
A-22, A-76

NG

Repair

Check the solenoid valve. 
(Refer to P.35B-43.)

NG

Replace the hydraulic unit.

ABS  – 

Troubleshooting

ABS  – 

Troubleshooting

35B-16

<EVOLUTION-IV>

Code No.51 Valve relay system

Probable cause

This code is output under any of the following conditions:

D

The solenoid valve power is not supplied when ABS-ECU attempts to turn ON
the valve relay as part of the initial check when the ignition switch is turned ON.

D

The solenoid valve power remains supplied when ABS-ECU attempts to turn OFF
the valve relay as part of the initial check when the ignition switch is turned ON.

D

The solenoid valve power is not supplied while the valve relay remains ON under
normal conditions.

D

Defective ABS valve relay

D

Defective harness or connector

D

Defective ABS-ECU

NOTE
In the diagnosis code reading by means of the ABS warning lamp (refer to P.35B-4), this code is output
in addition to the actual diagnosis code since the valve relay connector is disconnected. 
If the ABS warning lamp turns ON even when the spot represented by the diagnosis code output in
addition to this code has been repaired, and if no diagnosis code other than No. 51 is output, then
the valve relay system is probably defective. Make the following checks.

OK

Check the trouble symptom.

NG

Check and repair the harness between
junction block (general-purpose fuse
No. 6) and valve relay.

NG

Replace the ABS-ECU.

OK

Check the trouble symptom.

OK

Check the trouble symptom.

NG

Check and repair the harness between
valve relay and ABS-ECU.

OK

Check the following connectors:
A-76, B-25

NG

Repair

OK

Measure at A-76 valve relay connector
and B-25 ABS-ECU connector.

D

Disconnect the connector and
measure at the harness side.

D

Continuity across the following
terminals
OK: Conducting

Valve relay

ABS-ECU

side

side

3

–

34

5

–

42

NG

Check the following connectors:
A-76, B-25

NG

Repair

OK

Check the trouble symptom.

NG

Check and repair the harness between
fusible link No. 8 and valve relay.

OK

Measure at A-76 valve relay connector.

D

Disconnect the connector and
measure at the harness side.

D

Ignition switch: ON

(1) Voltage across 6 and body ground
(2) Voltage across 2 and body ground

OK: System voltage

(1) NG

Check the following connector:
A-76

NG

Repair

(2) NG

Check the following connector:
A-76, B-52, B-74, B-76

NG

Repair

Check the valve relay. 
(Refer to P.35B-39.)

NG

Replace

ABS  – 

Troubleshooting

ABS  – 

Troubleshooting

35B-17

<EVOLUTION-V, VI>

Code No.51 Valve relay system

Probable cause

This code is output under any of the following conditions:

D

The solenoid valve power is not supplied when ABS-ECU attempts to turn ON
the valve relay as part of the initial check when the ignition switch is turned ON.

D

The solenoid valve power remains supplied when ABS-ECU attempts to turn OFF
the valve relay as part of the initial check when the ignition switch is turned ON.

D

The solenoid valve power is not supplied while the valve relay remains ON under
normal conditions.

D

Defective ABS valve relay

D

Defective harness or connector

D

Defective ABS-ECU

NOTE
In the diagnosis code reading by means of the ABS warning lamp (refer to P.35B-4), this code is output
in addition to the actual diagnosis code since the valve relay connector is disconnected. 
If the ABS warning lamp turns ON even when the spot represented by the diagnosis code output in
addition to this code has been repaired, and if no diagnosis code other than No. 51 is output, then
the valve relay system is probably defective. Make the following checks.

OK

Check the trouble symptom.

NG

Check and repair the harness between
junction block (general-purpose fuse
No. 6) and valve relay.

NG

Replace the ABS-ECU.

OK

Check the trouble symptom.

OK

Check the trouble symptom.

NG

Check and repair the harness between
valve relay and ABS-ECU.

OK

Check the following connectors:
A-76, B-25

NG

Repair

OK

Measure at A-76 valve relay connector
and B-25 ABS-ECU connector.

D

Disconnect the connector and
measure at the harness side.

D

Continuity across the following
terminals
OK: Conducting

Valve relay

ABS-ECU

side

side

3

–

48

5

–

37

NG

Check the following connectors:
A-76, B-25

NG

Repair

OK

Check the trouble symptom.

NG

Check and repair the harness between
fusible link No. 8 and valve relay.

OK

Measure at A-76 valve relay connector.

D

Disconnect the connector and
measure at the harness side.

D

Ignition switch: ON

(1) Voltage across 6 and body ground
(2) Voltage across 2 and body ground

OK: System voltage

(1) NG

Check the following connector:
A-76

NG

Repair

(2) NG

Check the following connector:
A-76, B-52, B-74, B-76

NG

Repair

Check the valve relay. 
(Refer to P.35B-39.)

NG

Replace