Mitsubishi Lancer Evolution IX. Manual - part 581

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-7

TROUBLESHOOTING <ACD>

TROUBLESHOOTING STRATEGY

M1221007000604

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 okay.

• Is the appropriate steering wheel installed at the 

centre of the steering column shaft correctly?

• Are the tyre, wheel size, specifications, air pres-

sure, balance, and wear state normal?

• Is the wheel alignment normal?

• Has the engine, suspension, etc. been remod-

eled in such a way that it will affect the ACD and 
AYC systems?

DIAGNOSIS FUNCTION

M1221007700012

ACD MODE INDICATOR LAMP SYSTEM

If a malfunction occurs in the ACD, all of the ACD 
mode indicator lamps (tarmac, gravel, and snow) will 
illuminate.
If all of the ACD mode indicator lamps (tarmac, 
gravel, and snow) are illuminating, check for diagno-
sis code.

METHOD OF READING THE DIAGNOSIS 
CODE

Use the M.U.T.-II/III to read the diagnosis code. 
(Refer to GROUP 00 

− How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-5

).

METHOD OF ERASING THE DIAGNOSIS 
CODE

Use the M.U.T.-II/III to erase the diagnosis code. 
(Refer to GROUP 00 

− How to Use Troubleshoot-

ing/Inspection Service Points 

P.00-5

).

AC311095AB

ACD mode indicator lamp

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-8

INSPECTION CHART FOR DIAGNOSIS 
CODES

M1221007800019

Diagnosis 
code No.

Diagnosis items

Reference page

12

Power supply voltage (valve power 
supply) system

open circuit or short circuit

P.22A-9

13

Fail-safe relay system (inside 
4WD-ECU)

open circuit or short circuit

P.22A-14

21

Wheel speed sensor system <FR>

open circuit or short circuit

P.22A-14

22

Wheel speed sensor system <FL>

open circuit or short circuit

P.22A-14

23

Wheel speed sensor system <RR>

open circuit or short circuit

P.22A-14

24

Wheel speed sensor system <RL>

open circuit or short circuit

P.22A-14

25

Wrong-diameter tyre

P.22A-18

26

Wheel speed sensor system

faulty output signal

P.22A-19

31

Steering wheel sensor system <ST-1, 
ST-2, ST-N>

open circuit or short circuit

P.22A-20

32

Steering wheel sensor system <ST-N> short circuit

P.22A-29

33

fixed

P.22A-29

34

Steering wheel sensor system <ST-1, 
ST-2>

short circuit or output fixed

P.22A-33

41

TPS system

open circuit or short circuit

P.22A-37

42

short circuit

P.22A-37

45

Pressure sensor system

open circuit or short circuit

P.22A-41

46

open earth

P.22A-46

47

abnormal power supply

P.22A-49

51

Longitudinal G-sensor system

open circuit or short circuit

P.22A-53

52

abnormal sensor

P.22A-62

56

Lateral G-sensor system

open circuit or short circuit

P.22A-68

57

abnormal sensor

P.22A-77

61

Stop lamp switch system

open circuit

P.22A-83

62

ACD mode switch system

stuck

P.22A-88

63

Parking brake switch system

short circuit or not returned 
to original position

P.22A-94

65

ABS monitor system

open circuit or defective 
ABS

P.22A-99

71

Proportional valve system <AYC>

open circuit or short circuit

Refer to GROUP 27 

− 

Diagnostic Trouble 
Code Chart 

P.27-9

72

Directional control valve system 
<Right>

open circuit or short circuit

Refer to GROUP 27 

− 

Diagnostic Trouble 
Code Chart 

P.27-9

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-9

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

DIAGNOSIS TROUBLE CODE PROCEDURES

Code No.12 Power supply voltage (valve power supply) system

73

Directional control valve system <Left> open circuit or short circuit

Refer to GROUP 27 

− 

Diagnostic Trouble 
Code Chart 

P.27-9

74

Proportional valve system <ACD>

open circuit or short circuit

P.22A-105

81

Electric pump relay system

open circuit or short circuit

P.22A-109

82

electric pump malfunction 
or pressure sensor defect

P.22A-113

84

AYC control error

Refer to GROUP 27 

− 

Diagnostic Trouble 
Code Chart 

P.27-9

85

ACD control error

−

Diagnosis 
code No.

Diagnosis items

Reference page

IGNITION
SWITCH (IG2)

4WD-ECU

POWER
SOURCE

Power supply circuit <LH drive vehicles>

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

TROUBLESHOOTING <ACD>

MANUAL TRANSMISSION (FF)

22A-10

OPERATION

The 4WD-ECU (terminal 13) is energized through 
the fuse by the ignition switch (IG2).

DIAGNOSIS CODE SET CONDITIONS

The power supply circuit opens or short-circuits if the 
power supply voltage of the 4WD-ECU is below 9 V 
or above 18 V.

Or code No.12 is set when the battery voltage drops.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the battery

• Malfunction of the 4WD-ECU

IGNITION
SWITCH (IG2)

4WD-ECU

POWER
SOURCE

Power supply circuit <RH drive vehicles>

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet