turn signal wiring diagram ISUZU TROOPER 1998 Service Repair Manual

6E±335 ENGINE DRIVEABILITY AND EMISSIONS
General Description
General Description (PCM and
Sensors)
58X Reference PCM Input
The powertrain control module (PCM) uses this signal
from the crankshaft position (CKP) sensor to calculate
engine RPM and crankshaft position at all engine speeds.
The PCM also uses the pulses on this circuit to initiate
injector pulses. If the PCM receives no pulses on this
circuit, DTC P0337 will set. The engine will not start and
run without using the 58X reference signal.
A/C Request Signal
This signal tells the PCM when the A/C mode is selected
at the A/C control head. The PCM uses this to adjust the
idle speed before turning ªONº the A/C clutch. The A/C
compressor will be inoperative if this signal is not
available to the PCM.
Refer to
A/C Clutch Circuit Diagnosis for A/C wiring
diagrams and diagnosis for the A/C electrical system.
Crankshaft Position (CKP) Sensor
The crankshaft position (CKP) sensor provides a signal
used by the powertrain control module (PCM) to calculate
the ignition sequence. The CKP sensor initiates the 58X
reference pulses which the PCM uses to calculate RPM
and crankshaft position.
Refer to
Electronic Ignition System for additional
information.
0013
Camshaft Position (CMP) Sensor and
Signal
The camshaft position (CMP) sensor sends a CMP signal
to the PCM. The PCM uses this signal as a ªsync pulseº totrigger the injectors in the proper sequence. The PCM
uses the CMP signal to indicate the position of the #1
piston during its power stroke. This allows the PCM to
calculate true sequential fuel injection (SFI) mode of
operation. If the PCM detects an incorrect CMP signal
while the engine is running, DTC P0341 will set. If the
CMP signal is lost while the engine is running, the fuel
injection system will shift to a calculated sequential fuel
injection mode based on the last fuel injection pulse, and
the engine will continue to run. As long as the fault is
present, the engine can be restarted. It will run in the
calculated sequential mode with a 1-in-6 chance of the
injector sequence being correct.
Refer to
DTC P0341 for further information.
0014
Engine Coolant Temperature (ECT) Sensor
The engine coolant temperature (ECT) sensor is a
thermistor (a resistor which changes value based on
temperature) mounted in the engine coolant stream. Low
coolant temperature produces a high resistance of
100,000 ohms at ±40
C (±40
F). High temperature
causes a low resistance of 70 ohms at 130
C (266
F).
The PCM supplies a 5-volt signal to the ECT sensor
through resistors in the PCM and measures the voltage.
The signal voltage will be high when the engine is cold and
low when the engine is hot. By measuring the voltage, the
PCM calculates the engine coolant temperature. Engine
coolant temperature affects most of the systems that the
PCM controls.
Tech 2 displays engine coolant temperature in degrees.
After engine start-up, the temperature should rise steadily
to about 85
C (185
F). It then stabilizes when the
thermostat opens. If the engine has not been run for
several hours (overnight), the engine coolant
temperature and intake air temperature displays should
be close to each other. A hard fault in the engine coolant
sensor circuit will set DTC P0177 or DTC P0118. An
intermittent fault will set a DTC P1114 or P1115.

6E±349 ENGINE DRIVEABILITY AND EMISSIONS

Damage during re-gapping can happen if the gapping
tool is pushed against the center electrode or the
insulator around it, causing the insulator to crack.
When re-gapping a spark plug, make the adjustment
by bending only the ground side terminal, keeping the
tool clear of other parts.

ºHeat shockº breakage in the lower insulator tip
generally occurs during several engine operating
conditions (high speeds or heavy loading) and may be
caused by over-advanced timing or low grade fuels.
Heat shock refers to a rapid increase in the tip
temperature that causes the insulator material to
crack.
Spark plugs with less than the recommended amount of
service can sometimes be cleaned and re-gapped , then
returned to service. However, if there is any doubt about
the serviceability of a spark plug, replace it. Spark plugs
with cracked or broken insulators should always be
replaced.
A/C Clutch Diagnosis
A/C Clutch Circuit Operation
A 12-volt signal is supplied to the A/C request input of the
PCM when the A/C is selected through the A/C control
switch.
The A/C compressor clutch relay is controlled through the
PCM. This allows the PCM to modify the idle air control
position prior to the A/C clutch engagement for better idle
quality. If the engine operating conditions are within their
specified calibrated acceptable ranges, the PCM will
enable the A/C compressor relay. This is done by
providing a ground path for the A/C relay coil within the
PCM. When the A/C compressor relay is enabled,
battery voltage is supplied to the compressor clutch coil.
The PCM will enable the A/C compressor clutch
whenever the engine is running and the A/C has been
requested. The PCM will not enable the A/C compressor
clutch if any of the following conditions are met:

The throttle is greater than 90%.

The engine speed is greater than 6315 RPM.

The ECT is greater than 119
C (246
F).

The IAT is less than 5
C (41
F).

The throttle is more than 80% open.
A/C Clutch Circuit Purpose
The A/C compressor operation is controlled by the
powertrain control module (PCM) for the following
reasons:

It improvises idle quality during compressor clutch
engagement.

It improvises wide open throttle (WOT) performance.

It provides A/C compressor protection from operation
with incorrect refrigerant pressures.
The A/C electrical system consists of the following
components:

The A/C control head.

The A/C refrigerant pressure switches.

The A/C compressor clutch.

The A/C compressor clutch relay.
The PCM.
A/C Request Signal
This signal tells the PCM when the A/C mode is selected
at the A/C control head. The PCM uses this to adjust the
idle speed before turning on the A/C clutch. The A/C
compressor will be inoperative if this signal is not
available to the PCM.
Refer to
A/C Clutch Circuit Diagnosis for A/C wiring
diagrams and diagnosis for A/C electrical system.
General Description (Exhaust Gas
Recirculation (EGR) System)
EGR Purpose
The exhaust gas recirculation (EGR) system is use to
reduce emission levels of oxides of nitrogen (NOx). NOx
emission levels are caused by a high combustion
temperature. The EGR system lowers the NOx emission
levels by decreasing the combustion temperature.
057RW002
Linear EGR Valve
The main element of the system is the linear EGR valve.
The EGR valve feeds small amounts of exhaust gas back
into the combustion chamber. The fuel/air mixture will be
diluted and combustion temperatures reduced.
Linear EGR Control
The PCM monitors the EGR actual positron and adjusts
the pintle position accordingly. The uses information from
the following sensors to control the pintle position:

Engine coolant temperature (ECT) sensor.

Throttle position (TP) sensor.

Mass air flow (MAF) sensor.
Linear EGR Valve Operation and Results
of Incorrect Operation
The linear EGR valve is designed to accurately supply
EGR to the engine independent of intake manifold
vacuum. The valve controls EGR flow from the exhaust

WIRING SYSTEM 8DÐ1
BODY AND ACCESSORIES
WIRING SYSTEM
CONTENTS
Service Precautions . . . . . . . . . . . . . . . . . . . 8DÐ3
General Description . . . . . . . . . . . . . . . . . . . 8DÐ4Notes for Working on Electrical Items . . 8DÐ4
Symbols and Abbreviations . . . . . . . . . . . 8DÐ10
Parts for Electrical Circuit . . . . . . . . . . . . . 8DÐ12
Reading the Circuit Diagram . . . . . . . . . . 8DÐ21
Main Data and Specifications . . . . . . . . . . . 8DÐ24 Fuse, Fusible Link and Circuit Breaker Location . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ24
Relay Location . . . . . . . . . . . . . . . . . . . . . . 8DÐ27
Diode Location . . . . . . . . . . . . . . . . . . . . . . 8DÐ30
Grounding Point . . . . . . . . . . . . . . . . . . . . . 8DÐ33
Cable Harness Routing . . . . . . . . . . . . . . . 8DÐ45
Fuse Block Circuit . . . . . . . . . . . . . . . . . . . . . 8DÐ53 Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ54
Start and Charging . . . . . . . . . . . . . . . . . . . . 8DÐ67 General Description . . . . . . . . . . . . . . . . . . 8DÐ67
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ68
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ70
Powertrain Control Module (PCM) . . . . . . . 8DÐ80 General Description . . . . . . . . . . . . . . . . . . 8DÐ80
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ81
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ93
QOSIII (4JG2) . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ111 General Description . . . . . . . . . . . . . . . . . . 8DÐ111
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ112
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ114
QOS and EGR System (4JG2) . . . . . . . . . . . 8DÐ118 General Description . . . . . . . . . . . . . . . . . . 8DÐ118
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ119
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ122
Headlight and Fog Light . . . . . . . . . . . . . . . . 8DÐ127 General Description . . . . . . . . . . . . . . . . . . 8DÐ127
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ128
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ130
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ134
Rear Foglight . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ150 Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ151
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ152
Headlight Leveling . . . . . . . . . . . . . . . . . . . . 8DÐ153 General Description . . . . . . . . . . . . . . . . . . 8DÐ153
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ154
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ155
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ156
Clearance Light, Taillight and License Plate Light . . . . . . . . . . . . . . . . . . . . 8DÐ159 General Description . . . . . . . . . . . . . . . . . . 8DÐ159
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ160
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ163
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ168
Interior Illumination Light . . . . . . . . . . . . . . 8DÐ180 General Description . . . . . . . . . . . . . . . . . . 8DÐ180
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ181
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ185
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ192
Turn Signal Light and Hazard Warning Light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ193
General Description . . . . . . . . . . . . . . . . . . 8DÐ193
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ194
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ197
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ202
Stoplight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ208 General Description . . . . . . . . . . . . . . . . . . 8DÐ208
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ209
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ212
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ216
Backup Light. . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ220 General Description . . . . . . . . . . . . . . . . . . 8DÐ220
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ221
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ223
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ227
Horn . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ230 General Description . . . . . . . . . . . . . . . . . . 8DÐ230
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ231
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ232
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ235
Dome Light, Luggage Room Light, Courtesy Light and Map Light . . . . . . . . . . 8DÐ237
General Description . . . . . . . . . . . . . . . . . . 8DÐ237
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ238
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ240
Power Door Lock . . . . . . . . . . . . . . . . . . . . . . 8DÐ244 General Description . . . . . . . . . . . . . . . . . . 8DÐ244
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ245
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ250
Diagnosi s. . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ2 56
Power Window . . . . . . . . . . . . . . . . . . . . . . . 8DÐ261 General Description . . . . . . . . . . . . . . . . . . 8DÐ261
Circuit Diagram. . . . . . . . . . . . . . . . . . . . . . 8DÐ262
Parts Location . . . . . . . . . . . . . . . . . . . . . . . 8DÐ263
Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ266
Cruise Control . . . . . . . . . . . . . . . . . . . . . . . . 8DÐ272

8DÐ194 WIRING SYSTEM
Circuit Diagram (RHD)-1
I-115
B-53
B1
H-2716
H-257
B-53
2 L
H-25100.85
R/B0.85
G/O
H-1612
HAZARD
WARNING
SW
TURN SIGNAL
LIGHT SWFLASHER
UNIT
0.85
G/B0.85
G/B
0.85
G/B0.85
P/B
0.85
P/B2.0
G/O0.3
R/G 0.85
G/R
ILLUMINATION
CONTROLLER
(3) 0.85
P/B 2.0
LG/B 0.5
B
1.25
B2.0
LG/B
2.0
LG/B
2.0
LG/B2.0
B/R2.0
B/R
0.85
R/B 0.85
R/B2.0
G/O
5.0
W BATT.(+)
F-3 15A
HORN,HAZARD
3.0
B/Y STARTER SW
(IG1)
C-3 10A
TURN
BACK
B-12
B-12
4
B-12
5 3
LR
AI-11
I-11
I-11
I-11
64 2 1
I-117
I-118
I-11 TAIL RELAY
(4) BACK UP
LIGHT
3
B
B-53
3 E
HORN RELAY
(2)
H-276
H-2710
B-19
BODY-RH
D08RW683

WIRING SYSTEM 8DÐ195
Circuit Diagram (RHD)-2
1.25
B1.25
B
0.5
B0.5
B 0.85
P/B 0.85
P/B
RR TURN
SIGNAL
LIGHT-RH
(BODY)FRT TURN
SIGNAL
LIGHT-RHSIDE TURN
SIGNAL
LIGHT-RH
R-124H-3222
1R-12
0.85
P/BC-313
1
1C-311H-7
0.85
P/B 0.85
P/B0.85
P/B
C-611
2C-61
B
7
H-15
C-167
C-39
FENDER-LH FENDER-RH FENDER-LH
A
C-701C-70
2
C-223C-22
1
H-714C-16 0.5
B
SIDE TURN
SIGNAL
LIGHT-LHFRT TURN
SIGNAL
LIGHT-LH
0.5
B 0.85
G/B 0.85
G/B 0.85
G/B0.85
G/B
TURN SIGNAL
INDICATOR
LIGHT
(METER)
8C-16
FENDER-LH1
R-134H-3221R-13
1
RR TURN
SIGNAL
LIGHT-LH
(BODY)
0.85
G/B
R-4
BODY-RR
D08RWC67

8DÐ196 WIRING SYSTEM
Circuit Diagram (RHD W/Bumper Built-in Type RR Turn Signal Light) -2
1.25
B
1.25
B 1.25
B
1.25
B1.25
B
0.5
B0.5
B
RR TURN
SIGNAL
LIGHT-RH
(BUMPER)FRT TURN
SIGNAL
LIGHT-RHSIDE TURN
SIGNAL
LIGHT-RH
0.85
P/BC-313
1
1C-311H-7
0.85
P/B 0.85
P/B0.85
P/B
C-611
2C-61
B
7
H-15
C-167
C-39
FENDER-LH FENDER-RH FENDER-LH
A
C-701C-70
2
C-223C-22
1
H-714
H-719
C-16 0.5
B
SIDE TURN
SIGNAL
LIGHT-LHFRT TURN
SIGNAL
LIGHT-LH
0.5
B 0.85
G/B 0.85
G/B 0.85
G/B0.85
G/B
0.85
G/O
0.85
G/O0.85
P/L
0.85
P/L 0.85
G/BTURN SIGNAL
INDICATOR
LIGHT
(METER)
TRAILER HARNESS
CONNECTOR
8C-16
FENDER-LH1
F-71H-3221H-3311F-7H-332
F-81F-8
2
6
RR TURN
SIGNAL
LIGHT-LH
(BUMPER)
0.85
G/B0.85
P/B
0.85
P/B
H-3222H-335
H-44
4
H-591H-443
H-3320
H-592H-447
0.85
P/B
R-4
BODY-RR
D08RWC66

8DÐ198 WIRING SYSTEM
Circuit Diagram (LHD)-1
I-115
B-53
B1
H-204
H-202
B-53
2 L
H-25170.85
R/B0.85
G/O
H-1614
HAZARD
WARNING
SW
TURN SIGNAL
LIGHT SWFLASHER
UNIT
0.85
G/B0.85
G/B
0.85
G/B0.85
P/B
0.85
P/B2.0
G/O0.3
R/G 0.85
G/R
ILLUMINATION
CONTROLLER
(3) 0.85
P/B 2.0
LG/B 0.5
B
1.25
B2.0
LG/B
2.0
LG/B
2.0
LG/B2.0
B/R2.0
B/R
0.85
R/B 0.85
R/B2.0
G/O
5.0
W BATT.(+)
F-3 15A
HORN,HAZARD
3.0
B/Y STARTER SW
(IG1)
C-3 10A
TURN
BACK
B-12
B-12
4
B-12
5 3
LR
AI-11
I-11
I-11
I-11
64 2 1
I-117
I-118
I-11 TAIL RELAY
(4) BACK UP
LIGHT
3
B
B-53
3 E
HORN RELAY
(2)
H-2519
H-2520
B-19
BODY-LH
D08RW872

WIRING SYSTEM 8DÐ199
Circuit Diagram (LHD)-2
1.25
B1.25
B
0.5
B0.5
B 0.85
P/B 0.85
P/B
RR TURN
SIGNAL
LIGHT-RH
(BODY)FRT TURN
SIGNAL
LIGHT-RHSIDE TURN
SIGNAL
LIGHT-RH
R-124H-3222
1R-12
0.85
P/BC-313
1
1C-316H-7
0.85
P/B 0.85
P/B0.85
P/B
C-611
2
(4JG2)C-61
B
4
H-13
C-164
C-391
C-39
FENDER-LH FENDER-RH
(4JG2)
6
C-16
FENDER-LH
A
C-701C-70
2
C-223C-22
1
H-714C-16 0.5
B
0.5
B
SIDE TURN
SIGNAL
LIGHT-LHFRT TURN
SIGNAL
LIGHT-LH
0.5
B 0.85
G/B 0.85
G/B 0.85
G/B0.85
G/B
TURN SIGNAL
INDICATOR
LIGHT
(METER)
8C-16
FENDER-LH1
R-134H-3221R-13
1
RR TURN
SIGNAL
LIGHT-LH
(BODY)
0.85
G/B
R-4
BODY-RR
D08RW867

8DÐ200 WIRING SYSTEM
Circuit Diagram (LHD W/Bumper Built-in Type RR Turn signal Light)-2
1.25
B
1.25
B1.25
B
0.5
B0.5
B
RR TURN
SIGNAL
LIGHT-RH
(BUMPER)FRT TURN
SIGNAL
LIGHT-RHSIDE TURN
SIGNAL
LIGHT-RH
0.85
P/BC-313
1
1C-316H-7
0.85
P/B 0.85
P/B0.85
P/B
C-611
2C-61
B
4
H-13
C-164
C-39
FENDER-LH FENDER-RH FENDER-LH
A
C-701C-70
2
C-223C-22
1
H-714C-16 0.5
B
SIDE TURN
SIGNAL
LIGHT-LHFRT TURN
SIGNAL
LIGHT-LH
0.5
B 0.85
G/B 0.85
G/B 0.85
G/B0.85
G/B
0.85
G/BTURN SIGNAL
INDICATOR
LIGHT
(METER)
8C-16
FENDER-LH1
F-71H-3221H-3311F-7H-332
F-81F-8
2
6
RR TURN
SIGNAL
LIGHT-LH
(BUMPER)
0.85
G/B0.85
P/B
0.85
P/B
H-3222H-335
0.85
P/B
R-4
BODY-RR
D08RW868

WIRING SYSTEM 8D – 383
Circuit Diagram (RHD)-2
D08RW705
X-165
X-164
F-7 15A
ANTI THEFT
ANTI-THEFT
HORNANTI-THEFT
RELAY
0.5
O/B HORN
0.5
G/Y0.5
G/Y0.85
P/B
X-162 0.85
G/O 0.85
G/O 0.85
G/O
0.5
O/B 0.85
G/O 0.85
G/O5.0
W BATT.(+)
B-228
B-2221H-1517
H-136C-192C-19
1
X-16
6
X-16
1SIDE
TURN
SIGNAL
LIGHT0.85
G/B
X-16
3
REAR
TURN
SIGNAL
LIGHT
ANTI-THEFT & KEYLESS ENTRY CONTROL UNIT3
H-1612X-8
X-8 X-82
1
HORN RELAY
2.0
G/O0.85
G/O
0.3
B/O
0.3
B/O0.85
G/Y
0.3
B/O 2.0
G/O5.0
WBATT.(+)
F-3 15A
HORN, HAZARD FL-1 80A
MAIN
HAZARD
WARNING SW
(2)
12
B-12
HORN SW
H-1516
B-227