Isuzu N-Series. Manual — part 1149
8-308 CAB AND CHASSIS ELECTRICAL
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
CAB AND CHASSIS ELECTRICAL 8-309
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
8-310 CAB AND CHASSIS ELECTRICAL
4-2. Even when The Tank Is Filled Up with Fuel, The Needle Does Not Reach “F”
• WHEN INSERTING AND PULLING OUT THE
CONNECTOR J-28 OF THE FUEL TANK UNIT
SEVERAL TIMES, DOES THE POINTER OF THE FUEL
GAUGE STAY AT THE SAME POSITION?
• DISCONNECT THE CONNECTOR OF THE FUEL TANK
UNIT
• CONNECT THE FUEL TANK UNIT HARNESS SIDE
CONNECTOR 1 J-28 AND 3 J-28 WITH A LEAD
WIRE
• WHEN THE STARTER SW IS TURNED ON, DOES THE
NEEDLE OVERSHOOT TO "F" AFTER ABOUT 5
MINUTES?
• IS THERE A BROKEN CIRCUIT IN THE PRINTED
CIRCUIT OF THE METER ASSEMBLY?
YES
NO
REPLACE THE PRINTED
CIRCUIT BOARD
CHECK THE FUEL
GAUGE AND REPLACE
IT IF FOUND
ABNORMAL
YES
YES
NO
YES
• IS THE RESISTANCE
VALUE OF THE FUEL
TANK UNIT NORMAL?
NO
REPLACE THE FUEL
TANK UNIT
• REMOVE THE FUEL TANK UNIT
• DOES THE FLOAT ARM OPERATE SMOOTHLY?
NO
REPAIR A POOR CONNECTION AT THE CONNECTOR
OF THE FUEL TANK UNIT
N8A0312E
CAB AND CHASSIS ELECTRICAL 8-311
4-3. When The Tank Is Not Full of Fuel, The Needle Overshoots (or Goes Up to “F”)
• DISCONNECT THE CONNECTOR OF THE FUEL TANK
UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES THE
NEEDLE STILL POINT TO "F"?
• IS THE CIRCUIT BETWEEN THE FUEL TANK UNIT
AND THE FUEL METER NORMAL?
YES
NO
NO
REPAIR A SHORT
CIRCUIT IN THE
CIRCUIT
REPAIR OR REPLACE
THE PRINTED CIRCUIT
BOARD
CHECK THE FUEL
GAUGE, AND REPLACE
IT IF NECESSARY
• IS THE PRINTED
CIRCUIT OF THE
METER ASSEMBLY
GROUNDED
SECURELY?
• ARE THE RESISTANCE VALUES OF THE
FUEL TANK UNIT AT "E" AND "F" POINTS
NORMAL?
YES
YES
YES
NO
REPLACE THE FUEL TANK UNIT
NO
• REMOVE THE FUEL TANK UNIT
• DOES THE FLOAT ARM OPERATE SMOOTHLY?
N8A0313E
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