Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 608

ENGINE ELECTRICAL 6D – 39

GLOW RELAY

The glow relay is located near the fuse box in the engine
compartment.

Use an ohmmeter to measure the resistance between
terminals No. 3 and No. 4.
If the measured value is outside the specified range, the
glow relay must be replaced.
Glow Relay Resistnace

Ohms

10 - 15

THERMO SWITCH/THERMO SENSOR

The thermo switch or thermo sensor are located on the
water outlet pipe.

Use a circuit tester to check the thermo switch for
continuity.
• Thermo switch (4JA1, 4JB1T engine)

OFF

→ ON : 7 - 13°C (44.6 – 55.4°F)

ON

→ OFF : Below 3°C (37.4°F)

• Thermo sensor (4JG2T engine)
Thermo Sensor Resistance

K-Ohm

Temperature

°C (°F)

Resistance

Temperature

°C (°F)

Resistance

-15

(5)

0

(32)

10

(50)

20

(68)

12.00

6.00
3.60
2.45

40 (104)
60 (140)
80 (176)

1.10
0.60
0.30

6D – 40 ENGINE ELECTRICAL

GLOW PLUG

Use a circuit tester to test the glow plugs for continuity.
Check each of the glow plugs for continuity.

ENGINE ELECTRICAL 6D – 41

TROUBLESHOOTING (For Charging and Starting system)

Refer to this Section to quickly diagnose and repair electrical problems.
Each troubleshooting chart has three headings arranged from left to right.
(1) Checkpoint

(2) Trouble Cause

(3) Countermeasure

This Section is divided into two Sub-Sections:
I.

Battery Charging and Noise Problems

1. No

Charging

2. Overcharging
3. Undercharging
4. Unstable

Charging

Current

5. Noise

II. Hard

Starting

1. Pinion Does Not Engage The Ring Gear When The Starter Switch Is Turned On
2. Pinion Engages The Ring Gear But The Engine Does Not Turn Over
3. Incorrect Pinion And Ring Gear Engagement
4. Starter Continues To Run After The Starter Switch Is Turned Off
5. Excessive Commutator Sparking

6D – 42 ENGINE ELECTRICAL

I. BATTERY CHARGING AND NOISE PROBLEMS

1. NO CHARGING

Checkpoint

Trouble

Cause

Countermeasure

Terminals and connectors

Broken or defective

Repair the push rod play

Ground connections

Poorly grounded

Correct

Brush with slip ring

Poor contact

Repair or replace

Generator stator coil

Open or scorched

Replace

Generator rotor coil

Open or scorched

Replace

Generator diode

Defective

Replace

IC regulator

Defective

Replace

OK

OK

OK

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG