Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 598

FUEL SYSTEM 6C – 51

ADJUSTMENT PROCEDURE FOR POTENTIOMETER

Development view of Potentiometer

1. Advance Assembly (CSD)

Remove the advance assembly from the injection pump
assembly.

6C – 52 FUEL SYSTEM

2. Digital Volt Meter and DC Constant Voltage Power

Supply.

1) Connect digital volt meter to B and C connector on

wire harness from potentiometer.

2) Connect DC constant voltage power supply to A (for

positive electricity) and C (for negative electricity)
connector on wire harness from potentiometer.

3) Supply DC 10V to between A and C connector.
4) Measure the output voltage from potentiometer at

idling position on the fuel control lever.

Idling Position Output Voltage

Volt

Until 99 Model

From 00 Model

4JA1T 1.62

± 0.45

2.12

± 0.45

4JG2T 1.41

± 0.45

1.41

± 0.45

5) Measure the output voltage from potentiometer at full

load position on the fuel control lever.

Full Load Position Output Voltage

Volt

Until 99 Model

From 00 Model

4JA1T 7.7

± 0.45

4.1

± 0.03

4JG2T - 3.65

± 0.03

3. Adjustment of Output Voltage from Potentiometer

If the Measuring value is without standard above, readjust
setting position of the potentiometer as below.
1) Loose the potentiometer fixing bolts.
2) Keep fuel control lever on idling position then move

the potentiometer until reading the output voltage
within standard.

3) Same time read the output voltage with full load

position on the control lever.

4) Make sure that fuel control lever return to idling

position by return spring.

5) Fix the advance assembly to the injection pump

assembly.

Note:
If can not be readjusted potentiometer output voltage,
recommend to contact Zexel or Bosch argent near
your garage.

ENGINE ELECTRICAL 6D – 1

SECTION 6D

ENGINE ELECTRICAL

TABLE OF CONTENTS

PAGE

Main Data and Specifications . . . . . . . . . . . . . . . . . . . . . . . 6D - 2

General Description. . . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 3

Wire Coding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6D - 5

Symbols and Abbreviations. . . . . . . . . . . . . . . . . . . . . . . 6D - 7

Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 9

Generator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6D - 10

Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . 6D - 10

Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6D - 12

Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 15

Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

6D - 22

Starter Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 26

Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . 6D - 26

Disassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6D - 27

Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 30

Reassembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . ..

6D - 35

Pre-heating System . . . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 38

Inspection and Repair . . . . . . . . . . . . . . . . . . . . . . . . . 6D - 38

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6D - 41

QOSll Preheating System. . . . . . . . . . . . . . . . . . . . . . . . 6D - 51

QOSll System Troubleshooting. . . . . . . . . . . . . . . . . . . . . .. 6D - 54

INDEX

6D – 2 ENGINE ELECTRICAL

MAIN DATA AND SPECIFICATIONS

Description

4JA1TC, 4JH1TC

4JA1, 4JA1T (L), 4JB1T

4JG2T

Item

General Option General Option General

Generator
Type
Voltage

V

Drive

and

rotation

Ground

polarity

AC brush with IC regulator and vacuum pump

12

V-belt, clockwise viewed from the drive pulley

Negative

Maximum

output

A

60

at 5,000 rpm

80

at 5,000 rpm

40

at 5,000

rpm

50

at 5,000

rpm

80

at 5,000

rpm

60

at 6,000 rpm

Engine speed ratio

to 1

1.77

1.85

1.77

Maximum

speed

rpm

11,000

11,000

11,000 9,500

11,000

Starter Motor
Type
Rated

voltage

V

Solenoid controlled

12

Rated

output

kW

2.3

2.8

Load

characteristics

Terminal

voltage

V

Load

current

A

8.76

300

Vacuum Pump
Delivery

volume

cm

3

/rev

500 mmHg build up time

30

35 seconds or less at 1,000 rpm

50

21 seconds or

less at

1,000 rpm

7~10 seconds or less at 5,000 rpm

Maximum vacuum

680 mmHg or more at 5,000

rpm

650 mmHg or more at 5,000 rpm

Weight

kg(lb)

0.65 (1.43)

0.9 (1.99)

1.2 (2.6)