Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1393
ELECTRICAL-BODY AND CHASSIS 8-137
8-138 ELECTRICAL-BODY AND CHASSIS
CIRCUIT DIAGRAM (W/ TACHOMETER (RHD))
ELECTRICAL-BODY AND CHASSIS 8-139
8-140 ELECTRICAL-BODY AND CHASSIS
TROUBLESHOOTING
SPEEDOMETER
1. Speedometer and odometer do not function
Checkpoint
Trouble Cause
Countermeasure
Replace the vehicle speed
sensor
Vehicle speed sensor
malfunction
NG
Repair an open circuit in the
circuit or a poor connection at
the connectors
Continuity between the vehicle
speed sensor and the meter,
or the fuse (LHD: CB-7
(15A)/RHD: CB-5 (15A)) and
the ground
Open circuit or poor connector
contact
Replace the speedometer
Use a meter tester to check
the speedometer function
Speedometer malfunction
NG
NG
OK
OK
Check the vehicle speed
sensor output
(4 pulses/1 rotation)
2. Speedometer needle fluctuates
(May be wide fluctuation)
Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a
connectors
Vehicle speed sensor
malfunction, or open circuit or
poor connector contact
NG
Replace the speedometer
Use a meter tester to check
the speedometer function
Speedometer malfunction
NG
OK
Check the speed sensor
output by using the
oscilloscope
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