Isuzu Trooper (1998-2002 year). Manual - part 587

6D – 22 ENGINE ELECTRICAL

1. Using a press with a socket wrench attached,

reassemble rotor and rear end cover assembly in
the front cover.

2. Install pulley on the rotor.

Secure the pulley directly in the vise between two
copper plates, and tighten nut to the specified
torque.

Torque: 111 N·m (11.3 kg·m / 82 lb ft)

066RS022

066RS010

MAIN DATA AND SPECIFICATIONS

General Specifications

Model

LR190-750B

LR-1100-731

Battery voltage

V

12

Rated output

A

90

100

Direction of rotation

Clockwise

(as viewed from pulley side)

Rated rotation speed

rpm

5,000

Maximum speed

rpm

18,000

ENGINE ELECTRICAL 6D – 23

QOS4 PREHEATING SYSTEM

GENERAL DESCRIPTION

QOS4 preheating system features a quick-on glow plug
with thermometer control of the glowing time and the
afterglow time function.

The system consists of the ECM, indicator lamp, ECT
sensor, vehicle speed sensor, relay and temperature
self-control type glow plugs.

With the employment of the ECT sensor, the glow time
changes according to the engine coolant temperature,
thus allowing optimum starting conditions to be
obtained.

The after glow time function is controlled by ECM.

NOTE:
Refer to DTC P0380 and P0381 of 6E section.

SYSTEM DIAGRAM

+

-

KEY
50A

ECM
50A

GLOW
50A

2
WHT/
RED

0.5
BLK/
BLU

ECM

J1-15

3

WHT/

RED

3

RED/

BLK

MAIN
80A

8BLK/RED

Glow
Relay

GLOW PLUG   4

BATT

Heater & A/C

Relay

060RW132

6D – 24 ENGINE ELECTRICAL

1

Inspection on Quick Heating Operation

1. Disconnect ECT-sensor connection on the

thermostat housing

Legend

(1) ECT Sensor
(2) EVRV

2. Connect the circuit tester between glow plug and

engine earth.

3. Inspect the following items with starter switch set to

ON position (but do not start the engine).
1) The glow indicator shall light for about 5 sec.
2) The circuit tester shall indicate power supply

voltage for 180 sec.
If above specifications are not satisfied, inspect
wire harness, glow relay and ECT-sensor. If
satisfied, inspect glow plug.

2

Inspection on Afterglow Operation

1. Disconnect ECT-sensor connection on the

thermostat housing

Legend

(1) ECT Sensor
(2) EVRV

2. Connect the circuit tester between glow plug and

engine earth.

3. Inspect the following item with the engine started.

1) The circuit tester shall indicate about 12 volts

after 180 seconds of engine start.

•

If above specifications are not satisfied, inspect
battery voltage, engine earth, wiring harness,
glow plug, and ECM.

1

2

060RW166

065RW035

1

2

060RW166

065RW035

INSPECTION ON QOS4 SYSTEM OPERATION

ENGINE ELECTRICAL 6D – 25

ECT SENSOR

Measure the resistance depending on the water
temperature.

Temperature (°C)

Current (mA)

Resistance (k

Ω

)

20 ± 1

1.0

2.0 – 3.0

50 ± 1

1.0

0.6 – 1.0

When installing the ECT sensor, apply sealant (Loctite
#262 or equivalent) to prevent water leakage.

Torque: 8 N·m (0.8 kg·m/69 lb in)

Legend

(1) Sealing Material

GLOW PLUG

Inspect the resistance

Resistance at normal temperature: 0.8 – 1.0 

Ω

Torque: 23 N·m (2.3 kg·m/17 lb·ft)

GLOW PLUG RELAY

Inspect the continuity

(2) – (4)

No Continuity

(1) – (3)

Continuity

If battery voltage is applied to the terminal between (1)
– (3)

(2) – (4)

Continuity

065RW058

065RW061

1

065RW060

2

4

2

3

1

1

3

4

065RW037