ISUZU TROOPER 1995 Workshop Manual

CHASSIS ELECTRICAL 8-301
3. VOLTMETER
3-1 VOLTMETER NEEDLE DOES NOT MOVE ._..,
3-2 VOLTAGE READING IS TOO LOW {OR HIGH)
• IS THE METER ASSEMBLY CONNECTOR~ SECURELY CONNECTED?
I
YES I NO I
I
• DISCONNECT THE METER ASSEMBLY CONNECTORS~ AND(IiQJ
CONNECT THE CONNECTOR SECURELy I
• TURN ON THE STARTER SWITCH
• IS THE BATTERY VOLTAGE APPLIED BETWEEN THE HARNESS
SIDE CONNECTORS 14(m AND 4 ~ OF THE METER
ASSEMBLY?
I
YES I NO l
I
• IS THERE A OPEN CIRCUIT IN THE PRINTED CIRCUIT OF THE REPAIR A POOR CONNECTION OF THE CONNECTORS METER ASSEMBLY? OR A OPEN CIRCUIT IN T~IRCUIT BETWEEN THE
FUSE C-10 (10A) AND 14 1-9 I' OR THE CONNECTORS 4 [@] AND 4 C-39
I
YES ] NO I
I
REPLACE THE PRINTED CIRCUIT BOARD I CHECK THE VOLTMETER AND REPLACE IT A IF
NECESSARY (REFER TO THE CHECKING OF THE
VOLTMETER
IN THIS SECTION)

8-302 CHASSIS ELECTRICAL
4. ENGINE COOLANT TEMPERATURE (ECT) GAUGE
4-1 NEEDLE DOES NOT MOVE
• IS THE CONNECTOR OF THE THERMO UNIT CONNECTED SECURELY?
I
YES I
I NO l
I
• DISCONNECT THE CONNECTOR OF THE THEMO UNIT. I CONNECT THE CONNECTOR SECURELY I
• CONNECT A 3.4~B BETWEEN THE HARNESS SIDE CONNECTOR 1 E-19 AND THE GROUND OF THE THERMO
UNIT
• WHEN THE STARTER SW IS TURNED ON, DOES THE
ECT GAUGE POINTER MOVE ABOUT 10 SECONDS AFTER THAT?
I
YES I NO I
1
• IS THE THERMO UNIT NORMAL? I • IS THE CIRCUIT BETWEEN THE ECT GAUGE AND THE
THERMO UNIT NORMAL?
I I
YES I
I NO I I I
YES I l I NO
REPAIR A POOR CONNEC-I REPLACE THE THERMO UNIT I T T
TION AT THE CONNECTOR • IS THERE A BROKEN WIRE REPAIR A POOR CONNECTION
IN THE PRINTED CIRCUIT OF THE CONNECTORS OR A
OF THE METER ASSEMBLY? OPEN CIRCUIT IN THE CIRCUIT
I
I l
YES I NO I
I l
REPLACE THE PRINTED CHECK THE ECT GAUGE AND
CIRCUIT BOARD REPLACE IT WITH A CORRECT
ONE IF NECESSARY
•

CHASSIS ELECTRICAL 8-303
4-2 GAUGE READING ISTOO LOW (OR HIGH)
• DOES THE THERMOSTAT OPERATE NORMALLY? I
I
I
YES I NO I
I
• TURN THE STARTER SWITCH ON REPLACE THE THERMOSTAT I • WHEN INSERTING AND PULLING OUT THE THERMOSTAT
CONNECTOR 1 I E-191 SEVERAL TIMES, DOES THE INDICATION OF THE ECT GAUGE VARY?
I
I I
YES I NO I
I
REPAIR A POOR CONNECTION AT THE CONNECTOR • IS THE THERMO UNIT NORMAL? I OF THE THERMO UNIT
I
YES I NO I
I
• IS THERE A OPEN CIRCUIT IN REPLACE THE THERMO
THE METER ASSEMBLY UNIT
PRINTED CIRCUIT BOARD?
J
YES I NO I
I
REPLACE THE PRINTED CHECK THE ECT GAUGE,
CIRCUIT BOARD AND REPLACE IT IF
NECESSARY

8-304 CHASSIS ELECTRICAL
4-3 NEEDLE OVERSHOOTS (GOES UP TO THE 11H" RANGE)
• DISCONNECT THE CONNECTOR OF THE THERMO UNIT • WHEN THE STARTER SW IS TURNED ON, DOES THE
POINTER REACH TO THE "H" RANGE?
I
I I
YES I NO I
I I
• IS THERE
A SHORT CIRCUIT BETWEEN THE REPLACE
THE THERMO UNIT THERMO UNIT AND THE ENGINE COOLANT TEMPERATURE (ECT) GAUGE?
I
I
I
YES I NO I
I I
REPAIR THE SHORT CIRCUIT I • IS THE PRINTED CIRCUIT OF THE METER
ASSEMBLY GROUNDED SECURELY?
I
I l
YES I NO I
I I
CHECK
THE ECT GAUGE, REPAIR OR REPLACE THE PRINTED
AND REPLACE IT IF CIRCUIT BOARD
NECESSARY

5. OIL PRESSURE GAUGE
5-1 NEEDLE DOES NOT MOVE
• DISCONNECT THE CONNECTOR OF THE OIL PRESSURE UNIT
•
WHEN THE STARTER SW IS TURNED ON, DOES THE NEEDLE REMAIN STILL?
l
J I
YES I NO I
I I
CHASSIS ElECTRICAL 8-305
• IS THERE A SHORT CIRCUIT BETWEEN THE OIL REPLACE THE OIL PRESSURE UNIT I PRESSURE UNIT AND THE OIL PRESSURE GAUGE?
I
I I
YES I NO I
I l
REPAIR THE SHORT CIRCUIT I • IS THE PRINTED CIRCUIT OF THE METER ASSEMBLY GROUNDED SECURELY?
I
I I
YES I NO I
I I
CHECK THE OIL PRESSURE REPAIR OR REPLACE THE
GAUGE, AND REPLACE IT IF PRINTED CIRCUIT BOARD
NECESSARY

8-306 CHASSIS ELECTRICAL
5-2 OIL PRESSURE GAUGE READING IS TOO LOW (OR HIGH)
• (WHEN THE OIL PRESSURE IS MEASURED WITH THE MASTER METER)
DOES THE OIL PRESSURE GAUGE SHOWS THE CORRECT READING?
I
I
YES I NO I
I
• WHEN INSERTING AND PULLING OUT THE OIL CHECK FOR POSSIBLE ENGINE PROBLEM PRESSURE UNIT CONNECTOR 1 [IDSEVERAL TIMES, (REFER TO ENGINE SECTION) DOES THE INDICATION OF THE OIL PRESSURE GAUGE CHANGE?
I
I
YES I NO I
I
REPAIR A POOR CONNECTION AT THE CONNECTOR • IS THE OIL PRESSURE UNIT NORMAL? I OF THE OIL PRESSURE UNIT
I
YES J NO I
I
• IS THERE A OPEN CIRCUIT IN REPLACE THE OIL
THE PRINTED CIRCUIT BOARD PRESSURE UNIT
OF THE METER ASSEMBLY?
I
YES I NO I
I
REPLACE THE PRINTED CHECK THE OIL PRESSURE
CIRCUIT BOARD GAUGE, AND REPLACE IT
IF NECESSARY

5-3 NEEDLE OVERSHOOTS
(GOES
UP TO 215 lb/in2 )
• IS THE CONNECTOR OF THE OIL PRESSURE UNIT [ILl CONNECTED SECURELY?
I
I
YES I
I
• IS THE OIL PRESSURE UNIT NORMAL? I
I
I
YES
I
• IS THERE A OPEN CIRCUIT IN THE CIRCUIT
BETWEEN THE OIL PRESSURE UNIT AND THE OIL PRESSURE GAUGE?
I
I
YES I
I
REPAIR A POOR CONNECTION AT THE CONNECTORS
OR A OPEN CIRCUIT IN THE CIRCUIT
CHASSIS ELECTRICAL 8 -307
I
NO I
I
RECONNECT THE CONNECTOR I
I
NO I
I
REPLACE THE OIL PRESSURE UNIT I
I
NO I
I
• IS THERE A OPEN CIRCUIT IN THE PRINTED CIRCUIT BOARD OF THE METER ASSEMBLY?
I
I
I
YES I NO j
I I
REPLACE THE PRINTED CHECK THE OIL PRESSURE GAUGE,
CIRCUIT BOARD AND REPLACE IT WITH A CORRECT
ONE IF NECESSARY

8-308 CHASSJS ELECTRICAL
6. FUEL GAUGE
6-1 FUEL GAUGE NEEDLE DOES NOT MOVE
• IS THE CONNECTOR OF THE FUEL TANK UNIT(£[]
CONNECTED SECURELY?
I
YES I I NO I
I
• DISCONNECT THE CONNECTOR OF THE FUEL TANK UNIT I CONNECT THE CONNECTOR I
• CONNECT A 3.4W BULB BETWEEN THE HARNESS SIDE CONNECTOR 2 ~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?
I
YES I NO I
I
• IS THERE CONTINUTV BETWEEN THE FUEL TANK UNIT • IS THE CIRCUIT BETWEEN THE FUEL GAUGE AND THE FUEL
CONNECTOR TERMINALS 2 ~AND 1 [£I) ? TANK UNIT NORMAL?
I
I I
l
YES I NO I YES I NO l
I I I
REPAIR A POOR CONNEC-REPLACE THE FUEL TANK • IS THERE A BROKEN WIRE REPAIR A POOR CONNECTION
TION AT THE CONNECTORS UNIT IN THE PRINTED CIRCUIT AT THE CONNECTORS OR A
OR A OPEN CIRCUIT OF THE METER ASSEMBL Y7 OPEN CIRCUIT IN THE CIRCUIT
BETWEEN THE FUEL TANK
UNIT AND THE GAUGE I
I I
YES I NO I
I l
REPLACE THE PRINTED CHECK THE FUEL GAUGE,
CIRCUIT BOARD AND REPLACE IT IF NECESSARY
..

CHASSIS ELECTRICAL 8-309
6-2 EVEN WHEN THE TANK IS FILLED UP WITH FUEL, THE NEEDLE DOES
NOT REACH "F"
• WHEN INSERTING AND PULLING OUT THE CONNECTOR [£;§]OF THE FUEL TANK UNIT SEVERAL TIMES, DOES THE POINTER OF THE FUEL GAUGE STAY AT THE SAME POSITION?
I
YES I NO I
I
• DISCONNECT THE CONNECTOR OF THE FUEL TANK UNIT REPAIR A POOR CONNECTION AT THE CONNECTOR
• CONNECT
THE FUEL TANK UNIT HARNESS SIDE OF THE FUEL TANK UNIT CONNECTOR 1 [£;§]AND 2 [[§] WITH A LEAD WIRE.
•
WHEN THE STARTER SW IS TURNED ON, DOES THE
NEEDLE OVERSHOOT TO "F" AFTER ABOUT 5 MINUTES
I
YES I NO I
I
• REMOVE THE FUEL TANK UNIT • IS THERE A BROKEN CIRCUIT IN THE PRINTED
• DOES THE FLOAT ARM OPERATE SMOOTHLY? CIRCUIT OF THE METER ASSEMBLY?
I
I
I
YES I YES I NO J
I I
• IS THE RESISTENCE
REPLACE THE PRINTED CHECKTHEFUELGAUG~ VALUE OF THE FUEL TANK CIRCUIT BOARD AND REPLACE IT IF UNIT NORMAL? NECESSARY
NO
REPLACE
THE FUEL TANK UNIT

8-310 CHASSIS ELECTRICAL
6-3 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"7
I
I I
YES I NO I
I I
• IS THE CIRCUIT BETWEEN THE FUEL TANK UNIT AND THE • REMOVE THE FUEL TANK UNIT FUEL GAUGE NORMAL?
• DOES THE FLOAT ARM OPERATE SMOOTHLY?
I I
I
I I
YES I NO I YES J
I I
I
• IS THE PRINTED CIRCUIT REPAIR A SHORT CIRCUIT • ARE THE RESISTANCE VALUES OF THE OF THE METER ASSEMBLY IN THE CIRCUIT FUEL TANK UNIT AT "E" AND "F" POINTS GROUNDED SECURELY? NORMAL?
I I
I I I
YES I NO I NO I
I I I
CHECK THE FUEL GAUGE, REPAIR OR REPLACE THE REPLACE THE FUEL TANK UNIT I AND REPLACE IT IF PRINTED CIRCUIT BOARD
NECESSARY
•