Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 1327

8–228 ELECTRICAL-BODY AND CHASSIS

TACHOMETER

1.

Tachometer does not function when engine is running

Checkpoint

Trouble Cause

Countermeasure

Tacho sensor malfunction,
or open circuit or poor
connector contact

Replace the tacho sensor,
or repair open circuit or
connector contact

Pulse between connector 
3 B-24   and the ground
when engine is running
(Should be pulse present)

Tachometer malfunction

Replace the tachometer

Tachometer function

OK

NG

NG

2.

Meter needle fluctuates
(May be wide fluctuation)

Tachometer malfunction

Replace the tachometer

Use a meter tester to check
the tachometer function

NG

ELECTRICAL-BODY AND CHASSIS 8–229

TEMPERATURE GAUGE AND THERMO UNIT

1.

No temperature indicates at all

Checkpoint

Trouble Cause

Countermeasure

Thermo unit malfunction

Replace the thermo unit

Thermo unit continuity
between connector 1  E-4
(or 1  C-71  ) and the
ground (Diesel engine: 
1  E-19  and the ground)

Gauge malfunction

Replace the temperature
gauge

Gauge function
1. Disconnect the unit con-

nector then connect 3.4W
bulb to wire harness side
with ground

2. Check indicating point

when starter SW. is ON
position (Temperature
should indicate)

Open circuit or poor
connector contact

Repair open circuit or
connector contact

Continuity between 1  E-4 

(or 1  C-71  ) and 6  B-24

(Diesel engine: 1  E-19  and

6  B-24

OK

OK

NG

NG

NG

2.

Temperature gauge incorrect readings in all ranges

Thermo unit malfunction

Replace the thermo unit

Thermo unit resistance
between connector  1  E-4
(or 1  C-71  ) and the
ground (Diesel engine: 
1  E-19  and the ground)
when disconnecting the
connector (Specified
resistance should indicate)

NG

8–230 ELECTRICAL-BODY AND CHASSIS

FUEL GAUGE AND FUEL TANK UNIT

1.

No fuel level indicates at all

Checkpoint

Trouble Cause

Countermeasure

Open circuit inside the tank
unit

Replace the tank unit

Tank unit continuity
between connector 1  F-1
and ground

Gauge 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)

Open circuit or poor
connector contact

Repair open circuit or
connector contact

Continuity between
connectors 11 B-23 and 
1 F-1

OK

OK

NG

NG

NG

2.

Fuel gauge gives incorrect readings in all ranges

Tank unit malfunction

Replace the tank unit

Tank unit resistance
position with the float at
checking points (Specified
resistance should indicate)

NG

ELECTRICAL-BODY AND CHASSIS 8–231

WARNING AND INCIDATOR LIGHT

1.

When the parking brake lever is pulled, the indicator light does not light up

Checkpoint

Trouble Cause

Countermeasure

Bulb burned out or loose
contact

Replace or reinstall the bulb

Brake indicator light bulb
continuity

NG

Incorrect SW. adjustment
or poor SW. point contact

Adjust or replace the
parking brake SW.

Parking brake SW.
installation position and
function

NG

OK

Open circuit or poor
connector contact

Repair open circuit or
connector contact

Continuity between the
parking brake SW.
connector 1 C-39 (4x4: 
1  R-4 ) and 12 B-23

NG

OK

Parking brake SW.
malfunction

Replace the parking brake
SW.

Continuity between the
parking brake SW.
connector 1 C-39   (4x4: 
1  R-4 ) and the ground
when the parking brake is
operated

NG

OK