Mitsubishi Electric Lancer Evolution-VII Workshop Manual page 918

MANUAL TRANSMISSION - Troubleshooting <ACD>
Code No.25 Wrong-diameter tire
Code No.25 is output as wrong-diameter tire when one of the four vehicle
speeds is outside the range of specified values in respect to the average of the
four vehicle speed sensors, when the vehicle speed is above 20 km/h with the
steering wheel in the straight ahead position.
However the warning lamp does not light up.
<Vehicles with ACD and AYC>
Are all four wheels mounted to normal tires?
NO→Repair
MUT-II Data List
D No.01 Vehicle speed sensor <FR>
D No.02 Vehicle speed sensor <FL>
D No.03 Vehicle speed sensor <RR>
D No.04 Vehicle speed sensor <RL>
OK: The speed meter display and MUT-II display match.
OK→Intermittent malfunction (Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions.)
Check the wheel speed sensor installation.
NG→Repair
Check the wheel speed sensor output voltage. (Refer to
GROUP 35B - On-vehicle Service.)
Measure at 4WD-ECU connector C-44.
D Measure the ECU terminal voltage.
D Ignition switch: ON
D Rotate the tire corresponding to the measured terminal by
one and a half to one rotate per second.
(1) Voltage between terminal 9 and body earth <FR>
(2) Voltage between terminal 6 and body earth <FL>
(3) Voltage between terminal 7 and body earth <RR>
(4) Voltage between terminal 8 and body earth <RL>
OK: Changes by 0 V ↔ 5 V.
Check the following connector: C-44
NG→Repair
MUT-II Data List
D No.01 Vehicle speed sensor <FR>
D No.02 Vehicle speed sensor <FL>
D No.03 Vehicle speed sensor <RR>
D No.04 Vehicle speed sensor <RL>
OK: The speed meter display and MUT-II display match.
NG→Replace the 4WD-ECU.
OK→Intermittent malfunction (Refer to GROUP 00 - Points to
Note for Intermittent Malfunctions)
YES
NG
OK
OK
OK
OK
Probable cause
D Tire fault
D Wheel speed sensor fault
D Rotor fault
D Wheel bearing fault
D Harness or connector fault
D ABS-ECU fault <Vehicles with ACD and AYC>
D 4WD-ECU fault
Check the wheel speed sensor and rotor.
NG
(Refer to GROUP 35B - Wheel Speed Sensor.)
NG→Repair
Check the wheel beearing. (Refer to GROUP 26 - On-vehicle
Service, and GROUP 27B - Rear Hub Assembly.)
NG→Repair
NG
Check the following connectors:
<L.H. drive vehicles> B-123, A-03, A-37, D-10, D-04, D-30,
C-146, C-111, C-128, A-43
<R.H. drive vehicles> B-123, A-03, A-37, D-10, D-04, D-30,
C-146, C-111, C-128, C-136
NG→Repair
Check the harness between the ABS-ECU and each wheel
speed sensor.
D Check for open circuit and ground of the output line.
D Check for open circuit and damage of the earth line.
NG→Repair
Check the following connectors:
<L.H. drive vehicles> C-44, B-123
<R.H. drive vehicles> C-44, C-147, B-123
NG→Repair
Check the harness between the 4WD-ECU and
ABS-ECU.
D Check for open circuit, ground and damage of
the power line.
NG→Repair
Refer to GROUP 35B - Troubleshooting. (Refer to Diagnosis
Code No.11, 12, 13, 14, 21, 22, 23, and 24.)
22A-11
OK
OK
OK
OK
OK
OK