Mitsubishi Lancer Evolution 7. Manual — part 281
REAR AXLE -
Troubleshooting <AYC>
27B-9
ERASING THE DIAGNOSIS CODES
Connect the MUT-II to the 16-pin diagnosis connector and
erase the diagnosis code. (Refer to GROUP 00 – How to
Use Troubleshooting/Inspection Service Points.)
Caution
Turn the ignition switch to the LOCK (OFF) position before
connecting or disconnecting the MUT-II.
INSPECTION CHART FOR DIAGNOSIS CODE
Diagnosis
code No.
Diagnosis items
Reference page
12
Power supply voltage (valve power supply) system
open- or short-circuit
Refer to
GROUP 22
13
Failsafe relay system <inside of 4WD-ECU>
open- or short-circuit
GROUP 22.
21
FR wheel speed sensor system
open- or short-circuit
22
FL wheel speed sensor system
open- or short-circuit
23
RR wheel speed sensor system
open- or short-circuit
24
RL wheel speed sensor system
open- or short-circuit
25
Wrong-diameter tire
26
Wheel speed sensor (faulty output signal)
31
Steer sensor (ST-1, ST-2, ST-N) system
open- or short-circuit
32
Steer sensor (ST-N) system
short-circuit
33
fixed
34
Steer sensor (ST-1, ST-2) system
short-circuit
or
output
fixed
41
TPS system
open-circuit or ground
42
short-circuit
45
Pressure sensor system
open-circuit or ground
46
open earth
47
abnormal power supply
51
G sensor (longitudinal) system
open- or short-circuit
52
defective sensor
56
G sensor (lateral) system
open- or short-circuit
57
defective sensor
REAR AXLE -
Troubleshooting <AYC>
27B-10
Diagnosis
code No.
Reference page
Diagnosis items
61
Stop lamp switch system
open-circuit
Refer to
GROUP 22
62
ACD mode changeover switch
stuck
GROUP 22.
63
Parking brake switch system
short-circuit or not re-
turned
65
ABS monitor system
open-circuit or defective
ABS
71
Proportioning valve <AYC> system
open- or short-circuit
27B-11
72
Directional control valve (right) system
open- or short-circuit
27B-12
73
Directional control valve (left) system
open- or short-circuit
27B-13
74
Proportioning valve <ACD> system
open- or short-circuit
Refer to
GROUP 22
81
Electric pump relay system
open- or short-circuit
GROUP 22.
82
electric pump malfunction
or pressure sensor defect
84
AYC control error
–
85
ACD control error
Refer to
GROUP 22.
NOTE
Code No.84 is not a code number output due to malfunction, but a code number output when control
for the 4WD-ECU to protect the AYC is stopped in excessive driving. AYC control can be recovered
by turning the ignition switch ON to OFF to ON.
REAR AXLE
-
Troubleshooting <AYC>
27B-11
INSPECTION PROCEDURES FOR DIAGNOSIS CODES
Code No. 71 Proportioning valve system
Probable cause
Thiscodeisoutputwhentheproportioningvalvecontrolcircuitisopen-orshort-circuited.
D
Defective proportioning valve
D
Defective harness or connector
D
Defective 4WD-ECU
<Vehicles with ACD + AYC>
NG
Check and repair the harness between
proportioning valve and body earth.
OK
Check the trouble symptom.
OK
Measure at proportioning valve con-
nector F-28.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between 2 and body
earth
OK: 2 Ω or less
NG
Check the following connectors:
F-28, F-24
NG
Repair
Measure at proportioning valve con-
nector F-28.
D
Disconnect the connector and
measureattheproportioningvalve.
D
Resistance between 2 and 3
OK: 4.7 Ω or less
NG
Replace the hydraulic unit. (Refer to
P.27B-61.)
OK
Replace 4WD-ECU.
NG
Check the harness between propor-
tioning valve and 4WD-ECU.
NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
C-44, C-130*, C-134, F-24, F-28
NG
Repair
*: L.H. drive vehicles
<Vehicles with ACD>
OK
Replace 4WD-ECU.
OK
Check the following connector:
C-43
NG
Repair
OK
Check and repair the harness between
4WD-ECU and body earth.
Measure at 4WD-ECU connector
C-43.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between 50 and body
earth
OK: 2 Ω or less
NG
Check the following connector:
C-43
NG
Repair
NG
Repair
REAR AXLE -
Troubleshooting <AYC>
27B-12
Code No. 72 Directional control valve (right) system
Probable cause
This code is output when the directional control valve (right) control circuit is open-
or short-circuited.
D
Defective directional control valve (right)
D
Defective harness or connector
D
Defective 4WD-ECU
<Vehicles with ACD + AYC>
NG
Check and repair the harness between
directional control valve (right) and
body earth.
OK
Check the trouble symptom.
OK
Replace 4WD-ECU.
NG
Checktheharnessbetweendirectional
control valve (right) and 4WD-ECU.
NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
C-44, C-130*, C-134, F-24, F-26
NG
Repair
OK
Measure at directional control valve
(right) connector F-26.
D
Disconnect the connector and
measure at the directional control
valve side.
D
Resistance between 1 and body
earth
OK: 2 Ω or less
NG
Check the following connectors:
F-26, F-24
NG
Repair
Measure at directional control valve
(right) connector F-26.
D
Disconnect the connector and
measure at the directional control
valve side.
D
Resistance between 1 and 2
OK: 19 - 21 Ω or less
NG
Replace the hydraulic unit. (Refer to
P.27B-61.)
*: L.H. drive vehicles
<Vehicles with ACD>
OK
Check and repair the harness between
4WD-ECU and body earth.
Measure at 4WD-ECU connector
C-43.
D
Disconnect the connector and
measure at the harness side.
D
Resistance between 50 and body
earth
OK: 2 Ω or less
NG
Check the following connector:
C-43
NG
Repair
OK
Replace 4WD-ECU.
OK
Check the following connector:
C-43
NG
Repair
NG
Repair
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