Mitsubishi Lancer Evolution VI. Manual — part 105
CHASSIS ELECTRICAL –
Combination Meters
54-24
TROUBLESHOOTING
INSPECTION CHART FOR TROUBLE SYMPTOMS
Trouble symptom
Inspection
procedure
Reference
page
Speedometer does not work.
1
54-24
Tachometer does not work.
2
54-25
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure 1
Speedometer does not work.
Probable cause
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.
D
Malfunction of vehicle speed sensor
D
Malfunction of speedometer
D
Malfunction of harness or connector
D
Malfunction of relevant ECU
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
1.
NG
OK
Replace the speedometer.
YES
Vehicle speed sensor circuit system
inspection (Refer to Inspection
Procedure 3 on P.54-26.)
OK
Check the following connectors.
B-09, B-50
NG
Repair
OK
Check trouble symptom.
Check the harness between the body
earth and combination meter, and repair
if necessary.
NG
2.
NG
Check the following connectors.
B-08, B-64, A-19
NG
Repair
OK
Check trouble symptom.
Check the harness between the com-
bination meter and the vehicle speed
sensor, repair if necessary.
NG
3.
NG
Check the following connectors.
B-09, B-49, B-75, B-73
NG
Repair
OK
Check trouble symptom.
Check the harness between the power
supply and combination meter, and
repair if necessary.
NG
MUT-
II
Self-Diag code
Is the diagnosis code 24 relating to MPI
system output?
CHASSIS ELECTRICAL –
Combination Meters
54-25
Inspection Procedure 2
Tachometer does not work.
Probable cause
The ignition signal may not be input from the engine, or there may be a malfunction
in the power supply or earth circuit.
D
Malfunction of tachometer
D
Malfunction of harness or connector
Disconnect the combination meter con-
nector B-08 and measure at the harness
sides.
1. Measure the voltage between
terminal No.33 and earth.
OK: 5 V
2. Continuity between the terminal
No.34 and earth
OK: Continuity
3. Voltage between the terminal No.42
and earth
OK: System voltage
1.
NG
Check the following connectors.
B-08, A-36, B-61, B-64, A-41, A-109
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the engine-
ECU and combination meter, and repair
if necessary.
2.
NG
Check the following connectors.
B-08, B-50, B-64, A-41
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the com-
bination meter and the body earth, and
repair if necessary.
OK
Replace the tachometer.
3.
NG
Check the following connectors.
B-08, B-75, B-76
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the power
supply and combination meter, and
repair if necessary.
YES
Refer to Group 13 – Troubleshooting,
No. 44 Ignition coils and power
transistors.
OK
MUT-
II
Self-Diag code
Is the diagnosis code 44 relating to MPI
system output?
CHASSIS ELECTRICAL –
Combination Meters
54-26
Inspection Procedure 3
Vehicle speed sensor circuit system inspection
Signals from the vehicle speed sensor are utilized both in the speedometer and the engine-ECU.
Vehicle speed sensor inspection (Refer to P.54-27.)
NG
Replace
OK
Disconnect the vehicle speed sensor connector A-19 and measure
at the harness side.
1. Voltage between the terminal No.1 and earth
OK: System voltage
2. Continuity between terminal No.2 and earth
OK: Continuity
3. Voltage between the terminal No.3 and earth
OK: 4.5 V or more
1.
NG
Check the following
connectors. A-19, B-64
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire between the vehicle speed sensor and
multi-purpose fuse 4, and repair if necessary.
3.
NG
Check the following
connectors. A-19, B-64,
B-08
NG
Repair
2.
NG
Check the following
connector. A-19
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between the vehicle speed sensor and combina-
tion meter, and repair if necessary.
OK
Check trouble symptom.
NG
Check the harness wire between the vehicle speed sensor and
body earth, and repair if necessary.
NOTE
If the trouble symptom still persists even after the above procedures are performed, check the vehicle
speed senosor output signal side circuit (harness, speedometer and engine ECU) for short-circuit.
CHASSIS ELECTRICAL –
Combination Meters
CHASSIS ELECTRICAL –
Combination Meters
54-27
ON-VEHICLE SERVICE
SPEEDOMETER CHECK
1.
Adjust the pressure of the tyres to the specified level.
2.
Set the vehicle onto a speedometer tester and use wheel
chocks to hold the rear wheels.
3.
Pull the parking brake lever firmly.
4.
To prevent the front wheel from moving from side to side,
attach tension bars to the tie-down hook, and secure
both ends to anchor plates.
5.
To prevent the vehicles from starting, attach a chain or
wire to the rear towing hook, and secure the other end
of the chain or wire firmly to an unmovable body.
6.
Check if the speedometer indication range is within the
standard values and if the pointer fluctuation is within
the limits.
Caution
Do not operate the clutch suddenly. Do not
increase/decrease speed rapidly while testing.
Standard values:
Vehicle speed km/h
Speedometer indication
allowable errors km/h
40
37 – 45
80
75 – 88
120
113 – 132
160
150 – 176
Limit: Pointer fluctuation
(at vehicle speeds of higher than 35 km/h)
±
3 km/h
TACHOMETER CHECK
1.
Insert a paper clip in the engine speed detection connector
from the harness side, and attach the engine
speedometer.
2.
Compare the readings of the engine speedometer and
the tachometer at every engine speed, and check if the
variations are within the standard values.
Standard values:
700 r/min :
±
100 r/min
3,000
*1
r/min :
±
150 r/min
3,000
*2
r/min :
+
225 to –100 r/min
5,000
*1
r/min :
±
250 r/min
5,000
*2
r/min :
+
325 to –125 r/min
6,000
*1
r/min :
±
300 r/min
7,000
*2
r/min :
+
400 to –100 r/min
8,000
*3
r/min :
+
400 to 0 r/min
NOTE
*1: Tachometer measurable up to 8,000 r/min
*2: Tachometer measurable up to 9,000 r/min and one measurable up to 10,000 r/min
*3: Tachometer measureble up to 10,000 r/min
Wheel chocks
Tension bar
Tie-down hook
Front
Anchor plate
Engine speed detection
connector
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст