Mitsubishi Lancer Evolution VI. Manual — part 53
REAR AXLE –
Troubleshooting <AYC>
27-6
4. INSPECTION PROCEDURES FOR DIAGNOSIS CODES
Code No. 12: Power supply voltage (valve power supply)
system
Probable cause
This code is output when the AYC-ECU power supply voltage drops below, goes
beyond, a specified level.
D
Defective harness or connector
D
Defective battery
D
Defective AYC-ECU
NOTE
Refer to the corresponding item if any other diagnosis code is being output.
Is the battery voltage correct?
NG
Replace
OK
Measure at B-96 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Voltage across 31 and body ground
OK: System voltage
NG
Check the following connectors:
B-96, B-94, B-49, B-75, B-76
OK
Check the trouble symptom.
NG
Check and repair harness between
ignition switch (IG
2
) and AYC-ECU.
OK
Replace AYC-ECU.
NG
Repair
Code Nos. 21, 22, 23, 24: Wheel speed sensor system
Probable cause
This code is output if any one of three wheel speed sensors fails to provide an input
even after the other wheel exceeded 8 km/h.
D
Defective harness or connector
D
Defective ABS-ECU
D
Defective AYC-ECU
<Vehicles with ABS>
NG
Replace AYC-ECU.
OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.
NG
Repair
OK
Check the trouble symptom.
Is an ABS diagnosis code No. 21, 22,
23, or 24 output?
YES
Refer to Group 35B – Troubleshooting
NO
Measure at B-95 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Turn tire at 1/2 to 1 revolution/sec.
D
Voltage across 6/7/8/9 and body
ground
OK: 42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)
OK
Check the following connector:
B-95
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95
NG
Repair
NG
Repair
REAR AXLE –
Troubleshooting <AYC>
27-7
<Vehicles without ABS>
OK
Check the wheel bearing.
NG
Check and repair the harness between
wheel speed sensor and AYC-ECU.
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95
NG
Repair
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19
NG
Repair
OK
Measure at B-95 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Resistance across 7-20 (front, LH),
6-19 (front, RH), 9-22 (rear, LH),
and 8-21 (rear, RH).
OK: 1.4 – 1.8 k
Ω
.
NG
Check the wheel speed sensor. (Refer
to Group 35B.)
Check the installation of wheel speed
sensor.
NG
Repair
OK
Check the wheel speed sensor output
voltage. (Refer to P.27-37)
NG
Check the wheel speed sensor and
ABS rotor. (Refer to Group 35B.)
NG
Replace
NG
Replace
REAR AXLE –
Troubleshooting <AYC>
27-8
Code No. 25: Wrong-diameter tire
Probable cause
This code is output if the speed of any one of the four wheels exceeds a specified
level with respect to the average of the four wheel speed sensor outputs when the
steering wheel is in the straight-ahead position and the vehicle speed exceeds 20
km/h. At this time, the warning lamp does not light up.
D
Defective harness or connector
D
Defective AYC-ECU
D
Defective ABS-ECU
<Vehicles with ABS>
OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.
NG
Repair
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95
NG
Repair
OK
Check the trouble symptom.
NO
Measure at B-95 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Turn tire at 1/2 to 1 revolution/sec.
D
Voltage across 6/7/8/9 and body
ground.
OK: 42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)
OK
Check the following connector:
B-95
YES
Is ABS diagnosis code No. 15 output?
YES
Group 35* – Refer to Troubleshooting
Are correct tires mounted on all four
wheels?
NO
Repair
NG
Repair
<Vehicles without ABS>
NO
Repair
NO
Check and repair the harness between
wheel speed sensor and AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19
NG
Repair
OK
Check wheel bearing.
NG
Replace
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95
NG
Repair
OK
Check wheel speed sensor output volt-
age. (Refer to p. 27-37.)
NG
Check wheel speed sensor and ABS
rotor. (Refer to Group 35B.)
YES
Check Wheel speed sensor for instal-
lation.
NG
Repair
Are correct tires mounted on all four
wheels?
NG
Replace
REAR AXLE – Troubleshooting <AYC>
27-9
Code No. 26: Wheel speed sensor system (faulty output
signal)
Probable cause
This code is output if the speed of one of the four wheels exceeds a specified level
when the vehicle speed is 20 km/h or more. At this time, the warning lamp is turned
on.
D
Defective harness or connector
D
Defective AYC-ECU
D
Defective ABS-ECU
<Vehicles with ABS>
OK
Replace ABS-ECU.
NG
Check harness between AYC-ECU
and ABS-ECU.
NG
Repair
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
NG
Check the following connectors:
B-24, B-95
NG
Repair
OK
Check the trouble symptom.
NO
Measure at B-95 AYC-ECU connector.
D
Disconnect the connector and
measure at the harness side.
D
Ignition switch: ON
D
Turn tire at 1/2 to 1 revolution/sec.
D
Voltage across 6/7/8/9 and body
ground.
OK: 42 mV or more (when mea-
sured with a circuit tester)
120 mV-P or more (when
measured with an oscillo-
scope)
NG
Check the following connector:
B-95
Is ABS diagnosis code No. 15 output?
YES
Refer to Group 35B – Troubleshooting
NG
Repair
<Vehicles without ABS>
NG
Check and repair the harness between
wheel speed sensor and AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connectors:
B-95, B-52, B-17, A-26, A-50, D-04,
D-14, D-19
NG
Repair
OK
Check wheel bearing.
NG
Replace
NG
Replace AYC-ECU.
OK
Check the trouble symptom.
OK
Check the following connector:
B-95
NG
Repair
OK
Check wheel speed sensor output volt-
age. (Refer to P.27-37.)
NG
Check wheel speed sensor and ABS
rotor. (Refer to Group 35B.)
Check wheel speed sensor for installa-
tion.
NG
Repair
NG
Replace
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст