Mitsubishi Lancer Evolution VI. Manual — part 57
REAR AXLE –
Troubleshooting <AYC>
27-22
INSPECTION PROCEDURE 3
AYC warning lamp does not light up when the ignition key
is turned to “ON” (engine stationary).
Probable cause
The lamp power supply circuit is probably open-circuited, lamp bulb is out, or the
circuit between AYC warning lamp and AYC-ECU or AYC-ECU itself is defective.
D
Blown fuse
D
AYC warning lamp out
D
Defective harness or connector
D
Defective AYC-ECU
NG
Check and repair the harness between
ignition switch (IG
2
) and AYC warning
lamp.
OK
Check the trouble symptom.
OK
Replace combination meter.
NG
Check the harness between AYC
warning lamp and AYC-ECU.
NG
Repair
OK
Check the trouble symptom.
OK
Replace AYC-ECU.
OK
Check the following connectors:
B-96, B-94, B-08
NG
Repair
OK
Measure at B-96 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Warning lamp when 36 is grounded
to body
OK: Lit up
NG
Check the lamp bulb.
NG
Replace
Measure at B-08 combination meter
connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Voltage across 48 and body ground
OK: Symptom voltage
NG
Check the following connectors:
B-08, B-74, B-76
NG
Repair
REAR AXLE –
Troubleshooting <AYC>
27-23
INSPECTION PROCEDURE 4
AYC warning lamp remains lit up after the engine has
started.
Probable cause
The AYC warning lamp ON circuit is probably short-circuited.
D
Defective combination meter
D
Defective harness (short-circuit)
D
Defective AYC-ECU
NOTE
This symptom is limited only when the communication with MUT-
II
is possible with AYC-ECU power supply
in normal condition and the diagnosis code is correct.
OK
Replace combination meter.
NO
Check the harness between AYC
warning lamp and AYC-ECU.
NG
Repair
Does the AYC warning lamp goes out
when the B-96 AYC-ECU connector
is disconnected?
YES
Replace AYC-ECU.
INSPECTION PROCEDURE 5
AYC is inoperative.
Unable to start or accelerate on slippery road surfaces.
Probable cause
The hydraulic oil level is probably low, there is an oil leak, the hydraulic unit is defective,
or the torque transfer differential is defective.
D
Low hydraulic oil level
D
Oil leak
D
Defective hydraulic unit
D
Defective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit.
NG
Replace the torque transfer differential.
Check the trouble symptom.
NG
Replace AYC fluid.
OK
Correct
Check the trouble symptom.
NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?
YES
Repair
OK
Check the AYC for operation.
(Refer to P.27-34.)
OK
Check the AYC fluid.
NG
Add hydraulic oil.
NG
Check hydraulic pressure..
(Refer to P.27-35.)
NG
Bleed the system of air.
(Refer to P.27-34.)
Check the hydraulic oil level.
NG
Check for oil leak.
OK
Repair
REAR AXLE –
Troubleshooting <AYC>
27-24
INSPECTION PROCEDURE 6
Rear tires are noisy during low-speed cornering.
Vehicle skews.
Probable cause
The hydraulic unit or torque transfer differential is probably defective.
D
Defective hydraulic unit
D
Defective torque transfer differential
NOTE
This symptom is limited only when the diagnosis code is correct.
NG
Replace the hydraulic unit.
NG
Replace the torque transfer differential.
Check the trouble symptom.
NG
Replace AYC fluid.
OK
Correct
Check the trouble symptom.
NO
Replace the torque transfer differential.
OK
Is foreign matter trapped in the hydrau-
lic line?
YES
Repair
Check the AYC for operation..
(Refer to P.27-34.)
OK
Check the AYC fluid.
NG
Check hydraulic pressure.
(Refer to P.27-35.)
NG
Bleed the system of air..
(Refer to P.27-34.)
REAR AXLE –
Troubleshooting <AYC>
27-25
DATA LIST REFERENCE TABLE
The following items can be read by t01he MUT-
II
from the ECU input data.
Item No.
Check item
Checking requirements
Normal value
01
Front-right wheel speed
Perform a test run.
Vehicle speeds
displayed on the
02
Front-left wheel speed
displayed on the
speedometer and
MUT
II
are identi
03
Rear-right wheel speed
MUT
-II
are identi-
cal.
04
Rear-left wheel speed
05
Front-right wheel speed
(0.2 km/h)
06
Front-left wheel speed (0.2
km/h)
07
Rear-right wheel speed
(0.2 km/h)
08
Rear-left wheel speed (0.2
km/h)
10
Vehicle speed
11
System voltage
Ignition switch: ON
Battery voltage
15
TPS opening
Accelerator pedal position/Igni-
tion switch: ON
Fully closed
300 – 1000mV
tion switch: ON
Partially open
Gradually increases
from the above val-
ue.
Fully open
4500 – 5000mV
19
Longitudinal acceleration
sensor
Vehicle stands on level ground
2.4 – 2.6V
sensor
Perform a test run.
Reading fluctuates
up or down with 2.5V
as its center.
20
Lateral acceleration sensor
Vehicle stands on level ground
2.4 – 2.6V
Perform a test run.
Reading fluctuates
up or down with 2.5V
as its center.
22
Steering wheel operation
Steering wheel turning direction
Ignition switch: ON
90 deg. clock-
wise
R90 deg
90 deg counter-
clockwise
L90 deg
23
Steering wheel turning
angular velocity
Steering wheel position
Ignition switch: ON
Not turned
0 deg/s
angular velocity
Ignition switch: ON
Turned
Reading varies ac-
cording to turning
speeds.
45
Idle position switch
Accelerator pedal position
Ignition position: ON
Not depressed
ON
Ignition position: ON
Depressed
OFF
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