Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1394
ELECTRICAL-BODY AND CHASSIS 8-141
3. Speedometer needle jumps erratically
Checkpoint
Trouble Cause
Countermeasure
Replace the vehicle speed
sensor, or repair an open
circuit in the circuit or a poor
connection at the connectors
Vehicle speed sensor
malfunction, or open circuit or
poor connector contact
NG
Replace the speedometer
Use meter tester to check the
speedometer function
Speedometer malfunction
NG
OK
Check the vehicle speed
sensor output by using the
oscilloscope
Inspection of a waveform by oscilloscope
1. Connect a resistance of 1.3 to 5k ohm (1.4W or more) between the harness side connectors 2
B-24
and 9
B-23
of the meter.
2. Install a speedometer tester.
2. Turn on the starter SW.
3. Check the waveform at the time when the vehicle speed is at 60km/h.
4. Trip odometer does not reset
Replace the speedometer
Faulty reset mechanism or
worn gear
NG
Check at other kilometer
figures given by meter tester
(Reset should be made to
zero kilometer)
8-142 ELECTRICAL-BODY AND CHASSIS
TACHOMETER
1. Tachometer does not function when engine is running
Checkpoint
Trouble Cause
Countermeasure
Replace the tacho sensor, or
repair open circuit or
connector contact
Tacho sensor malfunction, or
open circuit or poor connector
contact
NG
Replace the tachometer
Tachometer function
Tachometer malfunction
NG
OK
Pulse between connector
B-24
and the ground when
engine is running (Should be
pulse present)
2. Meter needle fluctuates
(May be wide fluctuation)
Replace the tachometer
Tachometer malfunction
NG
Use a meter tester to check
the tachometer function
ELECTRICAL-BODY AND CHASSIS 8-143
TEMPERATURE GAUGE AND THERMO UNIT
1. No temperature indicates at all
Checkpoint
Trouble Cause
Countermeasure
Replace the thermo unit
Thermo unit malfunction
NG
Replace the temperature
gauge
Gauge function
1. Disconnect the unit
connector then connect
3.4W bulb to wire harness
side with ground
2. Check indicating point
when starter SW. is ON
position (Temperature
should indicate)
Gauge malfunction
Repair open circuit or
connector contact
Continuity between 1
E-8
and 6
B-24
Open circuit or poor connector
contact
NG
NG
OK
OK
Thermo unit continuity
between connector
E-8
and
the ground
2. Temperature gauge incorrect readings in all ranges
Replace the thermo unit
Thermo unit malfunction
NG
Thermo unit resistance
between connector 1
E-8
and the ground when
disconnecting the connector
(Specified resistance should
indicate)
8-144 ELECTRICAL-BODY AND CHASSIS
FUEL GAUGE AND FUEL TANK UNIT
1. No fuel level indicates at all
Checkpoint
Trouble Cause
Countermeasure
Replace the tank unit
Open circuit inside the tank
unit
NG
Thermo unit malfunction
Replace the fuel gauge
Fuel gauge function
1. Disconnect the tank unit
connector then connect
3.4W bulb to wire harness
side
2. Check indicating point
when starter SW. is ON
position (Fuel level should
indicate)
Gauge malfunction
Repair open circuit or
connector contact
Continuity between
connectors 11
B-23
and 1
F-1
Open circuit or poor connector
contact
NG
NG
OK
OK
Tank unit continuity between
connector 1
F-1
and ground
2. Fuel gauge gives incorrect readings in all ranges
Replace the tank unit
Tank unit malfunction
NG
Tank unit resistance position
with the float at checking
points (Specified resistance
should indicate)
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