Isuzu N-Series. Manual — part 1048
CAB AND CHASSIS ELECTRICAL 8-297
3. Coolant Temperature Gauge
3-1. Coolant Temperature Gauge Needle Does Not Move
• IS THE CONNECTOR OF THE THERMO UNIT
CONNECTED SECURELY?
• DISCONNECT THE CONNECTOR OF THE THERMO
UNIT
• CONNECT A 3.4W BULB BETWEEN THE HARNESS
SIDE CONNECTOR 1 E-7 AND THE GROUND OF THE
THERMO UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES THE
TEMPERATURE GAUGE NEEDLE MOVE ABOUT 10
SECONDS AFTER THAT?
• IS THE THERMO UNIT NORMAL?
YES
NO
REPAIR A POOR
CONNECTION AT THE
CONNECTOR
REPLACE THE
THERMO UNIT
YES
YES
NO
YES
• IS THERE A BROKEN
WIRE IN THE PRINTED
CIRCUIT OF THE
METER ASSEMBLY?
YES
NO
REPLACE THE PRINTED
CIRCUIT BOARD
CHECK THE COOLANT
TEMPERATURE GAUGE
AND REPLACE IT WITH A
CORRECT ONE IF
NECESSARY
• REPAIR A POOR
CONNECTION AT THE
CONNECTORS OR AN
OPEN CIRCUIT IN THE
CIRCUIT
NO
• IS THE CIRCUIT BETWEEN THE TEMPERATURE
GAUGE AND THE THERMO UNIT NORMAL?
NO
CONNECT THE CONNECTOR SECURELY
N8A0308E
8-298 CAB AND CHASSIS ELECTRICAL
3-2. Coolant Temperature Gauge Reading Is Too Low (or High)
• DOES THE THERMOSTAT OPERATE NORMALLY?
• TURN THE STARTER SWITCH ON
• WHEN INSERTING AND PULLING OUT THE
THERMOSTAT CONNECTOR 1 E-7 SEVERAL
TIMES, DOES THE INDICATION OF THE COOLANT
TEMPERATURE GAUGE VARY?
• IS THE THERMO UNIT NORMAL?
REPAIR A POOR CONNECTION AT THE CONNECTOR
OF THE THERMO UNIT
• IS THERE AN OPEN CIRCUIT IN THE METER
ASSEMBLY PRINTED CIRCUIT BOARD?
REPLACE THE THERMO UNIT
YES
YES
NO
YES
NO
YES
NO
REPLACE THE PRINTED CIRCUIT BOARD
CHECK THE COOLANT TEMPERATURE GAUGE AND
REPLACE IT IF FOUND DEFECTIVE
NO
REPLACE THE THERMOSTAT
N8A0309E
CAB AND CHASSIS ELECTRICAL 8-299
3-3. Needle Overshoots (or Goes Up to the “H” Range)
• DISCONNECT THE CONNECTOR OF THE THERMO
UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES
THE POINTER REACH TO THE "H" RANGE?
• IS THERE A SHORT CIRCUIT BETWEEN THE
THERMO UNIT AND THE COOLANT
TEMPERATURE GAUGE?
REPLACE THE THERMO UNIT
• IS THE PRINTED CIRCUIT OF THE METER
ASSEMBLY GROUNDED SECURELY?
REPAIR A SHORT CIRCUIT
YES
YES
NO
YES
NO
NO
REPAIR OR REPLACE THE PRINTED CIRCUIT BOARD
CHECK THE COOLANT TEMPERATURE GAUGE AND
REPLACE IT IF FOUND ABNORMAL
N8A0310E
8-300 CAB AND CHASSIS ELECTRICAL
4. Fuel Gauge
4-1. Fuel Gauge Needle Does Not Move
• IS THE CONNECTOR OF THE FUEL TANK UNIT J-28
CONNECTED SECURELY?
• DISCONNECT THE CONNECTOR OF THE FUEL
TANK UNIT
• CONNECT A 3.4W BULB BETWEEN THE HARNESS
SIDE CONNECTOR 1 J-28 AND THE GROUND OF
THE FUEL TANK UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES THE
FUEL GAUGE NEEDLE FLUCTUATE AFTER ABOUT 90
SECONDS?
• IS THERE CONTINUITY BETWEEN THE FUEL
TANK UNIT CONNECTOR TERMINALS 1 J-28
AND 3 J-28 ?
YES
NO
REPLACE THE FUEL
TANK UNIT
REPAIR A POOR
CONNECTION AT THE
CONNECTORS OR AN
OPEN CIRCUIT
BETWEEN THE FUEL
TANK UNIT AND THE
METER
YES
YES
NO
YES
• IS THERE A BROKEN
WIRE IN THE PRINTED
CIRCUIT OF THE
METER ASSEMBLY?
YES
NO
CHECK THE FUEL
METER, AND REPLACE IT
IF NECESSARY
REPLACE THE PRINTED
CIRCUIT BOARD
REPAIR A POOR
CONNECTION AT THE
CONNECTORS OR AN
OPEN CIRCUIT IN THE
CIRCUIT
NO
• IS THE CIRCUIT BETWEEN THE FUEL GAUGE AND
THE FUEL TANK UNIT NORMAL?
NO
CONNECT THE CONNECTOR SECURELY
N8A0311E
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