engine ISUZU TROOPER 1998 Service Repair Manual

WIRING SYSTEM 8D – 417
%38
Circuit Diagram (RHD 6V*1 W/T.O.D)-1
3
C-3910H-42
0.5
B/R0.5
B/R 0.5
B/R
B
DC
A
FENDER-RH
H-104M-10
2A
I 0.5
L/Y0.5
L/Y0.5
L/Y
1
M-109H-103H-9
0.5
LG/W0.5
LG/W
0.5
LG/W0.5
LG/W 0.5
LG/W0.5
R/W
SPEEDO-
METER
RESET
SWTACHOMETERENGINE
COOLANT
TEMPERATURE
GAUGEFUEL
GAUGE FUSE C-15
3
M-10125H-9
11H-10
VEHICLE
SPEED SENSOR
I-10
0.5
Y/B0.5
Y/B0.5
Y/B
1
E-191 9H-24
11H-6I-10
2
H-8
PCM
(D7)CRUISE CONTROL
UNIT(9)0.5
B/R
15
H-9
PCM
(C10)9I-9
0.5
Y/R
14H-2520I-10
ENGINE
COOLANT
TEMPERATURE
UNIT
8
I-10
METER
ODO/TRIP
METER

WIRING SYSTEM 8D – 423
Circuit Diagram (RHD 4JG2)-1
%38
6
C-3910H-41
0.5
B/R0.5
B 0.5
B/R
B
EG
F
D
A
FENDER-RH
H-514E-20
2A 0.5
Y 0.5
L/Y0.5
L/Y
1
E-2016H-5H-93
0.5
LG/W0.5
LG/W
0.3
LG/W0.3
LG/W 0.5
LG/W0.5
R/W
SPEEDO-
METER
RESET
SWTACHOMETERENGINE
COOLANT
TEMPERATURE
GAUGEFUEL
GAUGEOIL
PRESSURE
GAUGE FUSE C-15
3
E-20125H-9
15H-5
VEHICLE
SPEED SENSOR
I-10
0.5
Y/B0.5
Y/B0.5
Y/B
1
E-191 4H-24
4H-5I-10
QOS-III
CONTROL
UNIT
(9)QOS/EGR
CONTROL
UNIT
(16)0.5
BR
0.5
BR
0.5
BR
0.5
BP15
H-9
6H-49I-9
1E-36
0.5
Y/R
14H-2520I-10
ENGINE
COOLANT
TEMPERATURE
UNIT TACHO
SENSOR
0.5
Y/V0.5
LB 0.5
Y/V0.5
Y/B
1E-217 19H-9
2H-5
2
E-23H-5
C
0.5
BP 0.5
BP
6
C-39
FENDER-RH4H-42
I-10
OIL
PRESSURE
UNIT
8
I-10
METER
ODO/TRIP
METER
E-36
2
10H-4C

WIRING SYSTEM 8D – 431
D08RW924
Circuit Diagram (LHD 6V*1 W/O T.O.D)-1
8
C-3910H-42
0.5
B/R0.5
B/R 0.5
B/R
B
DC
A
FENDER-RH
H-104M-10
2A
I 0.5
L/Y0.5
L/Y0.5
L/Y
1
M-109H-105H-24
0.5
LG/W0.5
LG/W
0.5
LG/W0.5
LG/W 0.5
LG/W0.5
R/W
SPEEDO-
METER
RESET
SWTACHOMETERENGINE
COOLANT
TEMPERATURE
GAUGEFUEL
GAUGEOIL
PRESSURE
GAUGE FUSE C-15
3
M-10145H-9
11H-10
VEHICLE
SPEED SENSOR
I-10
0.5
Y/B0.5
Y/B0.5
Y/B
1
E-191 4H-9
11H-6I-10
8
H-8
PCM
(D7)CRUISE CONTROL
UNIT(9)0.5
B/R
18
H-9
PCM
(C10)9I-9
0.5
Y/R
13H-2620I-10
ENGINE
COOLANT
TEMPERATURE
UNIT
0.5
Y/G0.5
Y/B0.5
Y/B
1E-212 19H-9
10H-6I-10
OIL
PRESSURE
UNIT
8
I-10
METER
ODO/TRIP
METER

WIRING SYSTEM 8D – 437
D08RW915
Circuit Diagram (LHD 4JG2)-1
8
C-3910H-41
0.5
B/R0.5
B 0.5
B/R
B
EG
F
D
A
FENDER-RH
H-514E-20
2A 0.5
Y 0.5
L/Y0.5
L/Y
1
E-2016H-5H-245
0.5
LG/W0.5
LG/W
0.3
LG/W0.3
LG/W 0.5
LG/W0.5
R/W
SPEEDO-
METER
RESET
SWTACHOMETERENGINE
COOLANT
TEMPERATURE
GAUGEFUEL
GAUGEOIL
PRESSURE
GAUGE FUSE C-15
3
E-20145H-9
15H-5
VEHICLE
SPEED SENSOR
I-10
0.5
Y/B0.5
Y/B0.5
Y/B
1
E-191 4H-9
4H-5I-10
QOS-III
CONTROL
UNIT
(9)QOS/EGR
CONTROL
UNIT
(16)0.5
BR
0.5
BR
0.5
BR
0.5
BP18
H-9
6H-49I-9
1E-36
0.5
Y/R
13H-2620I-10
ENGINE
COOLANT
TEMPERATURE
UNIT TACHO
SENSOR
0.5
Y/V0.5
LB 0.5
Y/V0.5
Y/B
1E-212 19H-9
2H-5
2
E-23H-5
C
0.5
BP 0.5
BP
7
C-39
FENDER-RH4H-42
I-10
OIL
PRESSURE
UNIT
8
I-10
METER
ODO/TRIP
METER
E-36
2
10H-4C

WIRING SYSTEM 8DÐ449
I-9
Inspection of a waveform by oscilloscope
1. Check the waveform of the meter assembly connector 9 I-9 (Tachometer pulse).
Normal waveform
OV
6.7m sec.
MIN. 0.4VMAX. 4.3V
Engine revolution : 3000 rpm
1234567 891011121314
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

WIRING SYSTEM 8DÐ451
4. Engine Coolant Temperature (ECT) Gauge
4-1 Gauge Needle Does Not Move
·IS THE CONNECTOR OF THE ENGINE COOLANT
TEMPERATURE UNIT CONNECTED SECURELY?
YES
·
·
·DISCONNECT THE CONNECTOR OF THE ENGINE COOLANT
TEMPERATURE UNIT
CONNECT A 3.4W BULB BETWEEN THE HARNESS SIDE
CONNECTOR 1 E-19 OR 1 E-23 AND THE GROUND OF
THE ECT UNIT
WHEN THE STARTER SW IS TURNED ON, DOES THE
ECT GAUGE POINTER MOVE ABOUT 10 SECONDS
AFTER THAT?
YES
CONNECT THE CONNECTOR SECURELY
NO
NO
REPLACE THE ENGINE COOLANT
TEMPERATURE UNIT·IS THE CIRCUIT BETWEEN THE ECT GAUGE AND THE
ENGINE COOLANT TEMPERATURE UNIT NORMAL?
YES
REPLACE THE METER
ASSEMBLY
NO
REPAIR A POOR CONNECTION
AT THE CONNECTORS OR AN
OPEN CIRCUIT IN THE CIRCUIT

8DÐ452 WIRING SYSTEM
4-2 Gauge Reading Is Too Low (Or High)
·DOES THE THERMOSTAT OPERATE NORMALLY?
YES
·
·TURN THE STARTER SWITCH ON
WHEN INSERTING AND PULLING OUT THE ENGINE
COOLANT TEMPERATURE UNIT CONNECTOR 1 E-19 OR
1 E-23 SEVERAL TIMES, DOES THE INDICATION OF THE
ECT GAUGE VARY?
YES
REPLACE THE THERMOSTAT
NO
REPAIR A POOR CONNECTION AT THE CONNECTOR
OF THE ENGINE COOLANT TEMPERATURE UNIT
NO
·IS THE ENGINE COOLANT TEMPERATURE UNIT NORMAL?
YES
REPLACE THE ENGINE
COOLANT TEMPERATURE
UNIT
NO
REPLACE THE METER
ASSEMBLY

WIRING SYSTEM 8DÐ453
4-3 Needle Overshoots (Goes Up To The ÒHÓ Range)
·
·DISCONNECT THE CONNECTOR OF THE ENGINE
COOLANT TEMPERATURE UNIT
WHEN THE STARTER SW IS TURNED ON, DOES THE
POINTER REACH TO THE “H” RANGE?
YES
·IS THERE A SHORT CIRCUIT BETWEEN THE
ECT UNIT AND THE ECT GAUGE?
YES
REPLACE THE ENGINE COOLANT
TEMPERATURE UNIT
NO
REPAIR THE SHORT CIRCUIT
NO
REPLACE THE METER ASSEMBLY

WIRING SYSTEM 8DÐ455
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?
YES
·WHEN INSERTING AND PULLING OUT THE OIL
PRESSURE UNIT CONNECTOR E-2 OR E-12
SEVERAL TIMES, DOES THE INDICATION OF THE OIL
PRESSURE GAUGE CHANGE?
YES
CHECK FOR POSSIBLE ENGINE PROBLEM
(REFER TO ENGINE SECTION)
NO
REPAIR A POOR CONNECTION AT THE CONNECTOR
OF THE OIL PRESSURE UNIT
NO
·IS THE OIL PRESSURE UNIT NORMAL?
YES
REPLACE THE OIL
PRESSURE UNIT
NO
REPLACE THE METER
ASSEMBLY

8DÐ462 WIRING SYSTEM
7-3 While The Engine Is Operating, The Oil Pressure Warning Light Does Not Go Off
·
IS THE ENGINE OIL PRESSURE NORMAL?
YES
·WITH THE OIL PRESSURE SWITCH CONNECTOR
E-1 OR E-2 DISCONNECTED, DOES THE
WARNING LIGHT GO OFF?
YES
REFER TO THE “ENGINE” SECTION
NO
REPAIR A SHORT CIRCUIT BETWEEN 1 E-1
OR 2 E-12 AND THE METER
NO
·WHILE THE ENGINE IS OPERATING, IS THERE
CONTINUITY BETWEEN THE OIL PRESSURE SWITCH
CONNECTOR 1 E-1 AND THE BODY GROUND?
YES
REPLACE THE METER ASSEMBLYREPLACE THE OIL PRESSURE SWITCH
NO
7-4 Even When The Fuel Tank Is Full With Fuel, The Low Fuel Warning Light Lights Up
·WHEN THE ALARM & RELAY CONTROL UNIT
CONNECTOR B-7 IS DISCONNECTED,
DOES THE WARNING LIGHT GO OFF?
YES
·IS THE FUEL TANK UNIT NORMAL?
YES
REPLACE THE METER ASSEMBLY
REPAIR A SHORT CIRCUIT BETWEEN THE ALARM
& RELAY CONTROL UNIT HARNESS SIDE
CONNECTOR 6 B-7 AND 18 I-10 (METER)
NO
REPLACE THE FUEL TANK UNIT
NO