Troubleshooting - Mitsubishi Lancer Evolution-IV Workshop Manual

54-24

TROUBLESHOOTING

INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Speedometer does not work.
Tachometer does not work.
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Speedometer does not work.
Examine the diagnosis codes registered in the engine-ECU. If no wheel speed
sensor-relating diagnosis code has been output, the wheel speed sensors are in order.
MUT-II Self-Diag code
Is the diagnosis code 24 relating to MPI
system output?
OK
Disconnect the combination meter con-
nectors B-08 or B-09 and measure at
the harness sides.
1. Continuity between the terminal
No.11 and earth
OK: Continuity
2. Voltage between terminal No.51 and
earth.
OK: 4.7 V or more
3. Voltage between the terminal No.22
and earth
OK: System voltage
OK
Replace the speedometer.
CHASSIS ELECTRICAL –
YES
Vehicle speed sensor circuit system
inspection
Procedure 3 on P.54-26.)
1. NG
Check the following connectors.
B-09, B-50
Check trouble symptom.
Check the harness between the body
earth and combination meter, and repair
if necessary.
2. NG
Check the following connectors.
B-08, B-64, A-19
Check trouble symptom.
Check the harness between the com-
bination meter and the vehicle speed
sensor, repair if necessary.
3. NG
Check the following connectors.
B-09, B-49, B-75, B-73
Check trouble symptom.
Check the harness between the power
supply and combination meter, and
repair if necessary.
Combination Meters
Probable cause
D Malfunction of vehicle speed sensor
D Malfunction of speedometer
D Malfunction of harness or connector
D Malfunction of relevant ECU
(Refer to Inspection
NG
OK
NG
NG
OK
NG
NG
OK
NG
Inspection Reference
procedure page
1 54-24
2 54-25
Repair
Repair
Repair