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