engine ISUZU TROOPER 1995 Workshop Manual

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
•

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

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

CHASSIS ELECTRICAL 8-313
7-3 WHILE THE ENGINE IS OPERATING, THE OIL PRESSURE WARNING
LIGHT WILL
NOT GO OFF
• IS THE ENGINE OIL PRESSURE NORMAL? I
I
I I
YES I NO I
I I
• WITH THE OIL PRESSURE SWITCH CONNECTOR REFER TO THE "ENGINE" SECTION OF
~DISCONNECTED, DOES THE WARNING THIS MANUAL LIGHT GO OFF?
I
I I
YES I NO I
I I
• WHILE THE ENGINE IS OPERATING, IS THERE REPAIRctTIORT CIRCUIT BETWEEN 1 [ill CONTINUITY BETWEEN THE OIL PRESSURE SWITCH AND 9 1-10 (METER) CONNECTOR 1~ AND THE BODY GROUND?
I
I
NO I
I
REPLACE THE OIL PRESSURE SWITCH I
7-4 EVEN WHEN THE FUEL TANK IS FULL WITH FUEL, THE FUEL
WARNING LIGHT LIGHTS UP
• WHEN THE FUEL TANK UNIT CONNECTOR
[EIJ1s DISCONNECTED, DOES THE WARNING LIGHT GO OFF?
l
YES I NO I
I
• IS THE FUEL TANK UNIT NORMAL? I REPAIR A SHORT CIRCUIT BETWEEN THE FUEL
TiNK JNIT HARNESS SIDE CONNECTORS 4 F-5 AND 11 [I!QJ (METER)
1
NO I
I
REPLACE THE FUEL TANK UNIT I

8-316 CHASSIS ELECTRICAL
METER ASSEMBLY
LAYOUT FOR GAUGES, WARNING, INDICATOR AND ILLUMINATION LIGHTS .~
L
Voltmeter & engine
coolant temperature
gauge
B
Warning light lens
0
ClEO< AIR Et.llf>E BAG
NT shift indicator
Fig. 8-342
@ @
0 0
Oil pressure gauge & fuel gauge
..

CHASSIS ELECTRICAL 8-317
TABLE FOR METER CONNECTOR TERMINAL CONNECTIONS
~-""""""', 1----""'12 1----""'1! 6 1----l 6 [Iill
1----""'1 ~ 9 1---""'l,o
®
0 0
0
® @
0 0 ~
~m© © © © ©'--m ~~0
0 !III
1 2 3 4 5 6 7 8 9 1011 1213141516 1 2 3 4 56 7 8 9 10111213141516
w~~~~~~~~ ~~~~~~m rn~~~~~~ ~~nn~~m
~ I J BLACK WHITE
~r o. DTI -na No. ~
. IJJ:Q] -
. ~ [ill] . -. 1 Ground 1 Turn
signal indicator light (right)
1 -2 Engine coolant temperature gauge 2 ABS or RWAL indicator light 2 L
position
3 Tachometer 3 High-beam indicator light 3 2 position 4
Ground
4 High-beam
indicator light 4 3 position 6 Illumination light (+I 5 -5 D position
6 Illumination light(-) 6 Ground 6 N position 7 Winter drive 7 Speedometer 7 R position 8 Power drive, upshift 8 Speedometer 8 -9 Upshift 9 Oil pressure warning light 9 AfT shift control unit 10 -10 Brake warning light 10 P position 11 -11 Fuel warning light 12 Check engine 12 Charge warning light 13 Seat belt 13 Illumination (+) 14 StarterSW 14 Illumination (-) 15 4WD 15 Fuel gauge 16 Turn signal indicator light (left) 16 Oil pressure gauge
Fig. 8-343

3. Meter
• Remove four screws securing the meter at the
back side. (Fig.
8-351)
• Lift the meter carefully to remove it. (Fig. 8-
352).
0
q;J"' 0
0 0 0,
0 0
0 I
Fig. 8-351
Fig. 8-352
E) INSTALLATION
00
0
To install, follow the removal steps in the reverse
order.
CHASSIS ELECTRICAL 8-321
TACHOMETER (FIG. 8-353)
The tachometer is made up of the cross coil type
ammeter (movement) that displays indications, and
the drive circuit (printed board)
that makes exchange
between the
pulse signals and the current.
Fig.
8-353
(1!1 ON-VEHICLE SERVICE
1. Set up the tune-up tester to the engine.
2. Start the engine and compare the readings dis­
played by the tachometer and the tester.
When the difference between these
two readings
differs
largely from the specified value, replace it
with a correct one.
(rpm)
Tester
display speed Meter
display permissible level
750 690-770
1000
900-1060
2000 1820-2090
3000 2820-3120
4000 3820-4180
5000 4820-5180
6000 5820-6180
7000 6820-7180

8-324 CHASSIS ELECTRICAL
B REMOVAL (FIG. 8-359)
Preparation: Disconnect the battery ground cable.
Voltmeter
Fig. 8-359
1. Meter assembly
2. Meter cluster glass
ENGINE COOLANT TEMPERATURE
(ECT) GAUGE
CIRCUIT DIAGRAM OF ECT GAUGE
(FIG. 8-361)
SRS indicator bulb connector
Fig. 8-360
3. Voltmeter
• Loosen the screw for support the Supplemen­
tal
Restraint System (SRS)-AIR BAG indicator
light bulb connector.
• Remove three screws securing the meter at
the back side, and then remove
it together
with the
ECT gauge. (Fig. 8-360)
B INSTALLATION
To install, follow the removal steps in the reverse ....-...
order. ,........
Thermo unit
ECTgauge
Fig. 8-361
•

~ INSPECTION
131 Remove the engine coolant temperature (ECT)
gauge from the meter assembly, and measure
the resistance value between each terminal.
T·U
+
Fig. 8-362
E) REMOVAL AND INSTALLATION
1••1 Refer to the removal and installation steps the
voltmeter.
OIL PRESSURE GAUGE
CIRCUIT DIAGRAM OF THE OIL PRESSURE
GAUGE (FIG. 8-363)
CHASSIS ELECTRICAL 8 -325
(Fig. 8-362)
Replace the
ECT gauge when the result of inspec­
tion is found abnormal.
(Q)
Terminal symbol Resistance
value
(+)-T·U 82 ± 8.2
OILU
Oil pressure unit
,______ _ __ ___.
Oil pressure gauge
Fig. 8-363

OIL PRESSURE UNIT
(1!] INSPECTION
Measure the resistance value ofthe oil pressure unit
with the circuit tester. (Fig. 8-377)
Replace the
unit when the result of inspection is found
abnormal.
Pressure
(kPa)
Resistance value (Q)
Fig. 8-377
OIL PRESSURE SWITCH
(1!] INSPECTION
98 981
81 30
I~~ Check the continuity between the switch termi­
nal and the body ground with the engine at idle.
(Fig. 8-378)
Replace the switch when the result
of inspection
is
found abnormal.
Fig. 8-378
CHASSIS ELECTRICAL 8-331
(1!] CIRCUIT INSPECTION (FIG. 8-379)
Fig. 8-379
1. Start the engine.
2. When disconnecting the oil pressure switch con­
nector then connecting the harness side connec­
tor to the ground, check to see if the oil pressure
warning light lights up.
When the
light will not light up, check the circuit
between the meter and the oil pressure switch,
and repair
an open circuit if necessary.
FUEL TANK UNIT
The tank unit varies the internal resistance according
to the float position (fluid level) to operate the fuel
meter needle.
It is also designed
to warn the driver of low fuel level
by illuminating the fuel warning light. (Fig. 8-380)
Fig. 8-380