Mitsubishi Lancer Evolution IX. Manual — part 308

MB991439

TROUBLESHOOTING

REAR AXLE

27-7

TROUBLESHOOTING

TROUBLESHOOTING STRATEGY

M1272003900023

Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points

P.00-5

NOTE: Before starting the troubleshooting proce-
dure, make sure that the following items have been
checked.

•

The correct steering wheel has been installed in
the neutral position of the steering column shaft.

•

Tyre and wheel size are correct with correct spec-
ifications. Inflation pressure, balance, and wear
conditions are okay.

•

Wheel alignment is correct.

•

The engine, suspension, and other parts have not
been remodeled so as to affect the AYC system.

DIAGNOSIS FUNCTION

M1272004000023

READING DIAGNOSIS CODES
WHEN USING THE M.U.T.-II/III

Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points

P.00-5

MB991439

Bush remover &
installer

Removal and press-fitting of
differential support arm bushing

MB991460

Plug

Prevention of AYC differential
gear oil spilling and entry of
foreign material

MB990850

MB990850

End yoke holder

Companion flange fixing

MB990925

MB990925

A: MB990926

− MB990937

B: MB990938
C: MB990939

Bearing and oil
seal installer set

A: Installer

adapter

B: Bar
C: Brass bar

• Press-fitting of differential

carrier oil seal
(Use together with
MB991115)

For details of each installer,
refer to GROUP 26

− Special

Tools

P.26-3

Tool

Number

Name

Use

TROUBLESHOOTING

REAR AXLE

27-8

WHEN USING THE ACD MODE
INDICATOR LAMP

1. Turn the ignition switch to the "LOCK" (OFF)

position.

9 10 11 12 13 14 15 16

AC307005

MB991529

Diagnosis connector

2. Use special tool diagnosis code check harness

(MB991529) to earth terminal number 1
(diagnosis control terminal) of the diagnosis
connector.

3. Turn the ignition switch to the "ON" position.

AC306995 AB

ACD mode indicator lamp

4. Read out a diagnosis code by observing how the

ACD mode indicator lamp flashes.

When the diagnosis code No.24 is set

When no diagnosis code is set

ACX01777

Illuminated

Switched
off

Pause
time
3 secs.

Tens
signal

Place
division
2 secs.

Units
signal

1.5 secs.

0.5 sec.

ACX01778

Illuminated

Switched
off

0.25 sec.

5. Turn the ignition switch to the "LOCK" (OFF)

position.

6. Disconnect special tool diagnosis code check

harness (MB991529).

ERASING DIAGNOSIS CODES
WHEN USING THE M.U.T.-II/III

Refer to GROUP 00, How to Use Troubleshoot-
ing/Inspection Service Points

P.00-5

WHEN NOT USING THE M.U.T.-II/III

1. Turn the ignition switch to the "LOCK" (OFF)

position.

2. After disconnecting the battery cable from the

battery (

−) terminal for 10 seconds or more,

reconnect the cable.

3. After the engine has warmed up, rung it at idle for

about 15 minutes.

TROUBLESHOOTING

REAR AXLE

27-9

DIAGNOSIS CODE CHART

M1272004100064

Follow the inspection chart that is appropriate for the
diagnosis code.

Diagnosis code
No.

Inspection item

Diagnostic content

Reference page

Power supply voltage (valve
power supply) system

Open circuit or short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-9

Failsafe relay system (inside of
4WD-ECU)

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-14

Front right wheel speed sensor
system

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-14

Front left wheel speed sensor
system

Rear right wheel speed sensor
system

Rear left wheel speed sensor
system

Wrong size (diameter) tyre

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-18

Wheel speed sensor (faulty output signal)

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-19

Steer sensor (ST-1, ST-2, ST-N)
system

Open circuit or short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-20

Steer sensor (ST-N) system

Short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-29

Fixing

Steer sensor (ST-1, ST-2)
system

Short circuit or output fixing Refer to GROUP 22A,

Troubleshooting
<ACD>

P.22A-33

TPS system

Open circuit or earth circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-37

Short circuit

Pressure sensor system

Open circuit or earth circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-41

Pressure sensor system

Open earth

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-46

Short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-49

TROUBLESHOOTING

REAR AXLE

27-10

NOTE:

•

Code No.84 is not a code number output due to malfunction, but a code number output when control for
4WD-ECU to protect the AYC is stopped in excessive driving. AYC control can be recovered by turning
the ignition switch to the "ON" position to "OFF" position and to "ON" position.

•

Code No.85 is not a code number output due to malfunction, but a code number output when control for
4WD-ECU to protect the ACD is stopped in excessive driving. ACD control can be recovered by turning
the ignition switch to the "ON" position to "OFF" position and to "ON" position.

G sensor (longitudinal) system

Open circuit or short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-53

Defective sensor

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-62

G sensor (lateral) system

Open circuit or short circuit

Refer to GROUP 22A,
Troubleshooting
<ACD>

P.22A-68

Defective sensor