Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 1120
ELECTRICAL-BODY AND CHASSIS 8-237
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
8-238 ELECTRICAL-BODY AND CHASSIS
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)
ELECTRICAL-BODY AND CHASSIS 8-239
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)
8-240 ELECTRICAL-BODY AND CHASSIS
WARNING AND INCIDATOR LIGHT
1. When the parking brake lever is pulled, the indicator light does not light up
Checkpoint
Trouble Cause
Countermeasure
Replace or reinstall the bulb
Bulb burned out or loose
contact
NG
Adjust or replace the parking
brake SW.
Parking brake SW. installation
position and function
Incorrect SW. adjustment or
poor SW. point contact
Repair open circuit or
connector contact
Continuity between the
parking brake SW. connector
1
C-39
(4
×4: 1
R-4
) and 12
B-23
Open circuit or poor connector
contact
NG
NG
OK
OK
Brake indicator light bulb
continuity
Replace the parking brake
SW.
Continuity between the
parking brake SW. connector
1
C-39
(4
×4: 1
R-4
) and
the ground when the parking
brake is operated
Parking brake SW.
malfunction
NG
OK
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