Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual — part 532

6 – 2 TROUBLESHOOTING

Refer to the following troubleshooting charts to quickly pinpoint and repair engine problems.
1. This Section is divided into ten Sub-Sections.

Refer to the Table of Contents.

2. Each troubleshooting chart has three headings arranged from left to right.
Example:





















3. Easily checked areas are presented at the beginning of the troubleshooting chart. Procedures become more

complex as the chart progresses.

4. It is suggested that you work from the beginning of the troubleshooting chart. Do not start from the middle.
5. It is possible that a seemingly apparent engine problem is not related to the engine.

For example, the engine may appear to have insufficient power. This could be caused by dragging brakes or a
slipping clutch instead of an engine malfunction.

Refer to the other troubleshooting charts if required.

6. Optional equipment and variations are included in the troubleshooting charts.

If the vehicle you are servicing is not equipped with a particular option or variation noted in the “Checkpoint”
frame, disregard the frame and move on to the next one.

1503

Fuel line

Fuel filter cartridge

clogged or fouled

Replace the fuel flter

Fuel line clogged

Clean the fuel line

Fuel pump

Defective fuel pump

Replace the fuel pump

OK

NG

NG

NG

3.INSUFFICIENT POWER

Checkpoint Trouble

Cause

Countermeasure

TROUBLESHOOTING 6 – 3

HARD STARTING

1. STARTER INOPERATIVE

Checkpoint

Trouble

Cause

Countermeasure

Battery

Loose battery cable terminals

Poor connections due to rusting

Clean and/or retighten the

battery cable terminals

Battery discharged or weak

Recharge or replace the battery

Fan belt loose or broken

Adjust or replace the fan belt

Main fuse

Main fuse shorted

Replace the main fuse

Starter switch

Defective starter switch or

starter relay

Replace the starter switch or

the starter relay

Starter motor

Defective magnetic switch or

starter relay

Repair or replace the magnetic

switch

Defective starter motor

Repair or replace the starter

motor

OK

OK

OK

NG

NG

NG

NG

NG

NG

NG

6 – 4 TROUBLESHOOTING

150102

2. STARTER MOTOR OPERATES BUT ENGINE DOES NOT TURN OVER

Checkpoint

Trouble

Cause

Countermeasure

Battery

Loose battey cable terminals

Poor connections due to rusting

Clean and/or retighten the

battery cable terminals

Battery discharged or weak

Recharge or replace the battery

Fan belt loose or broken

Adjust or replace the fan belt

Starter motor

Defective pinion gear

Replace the pinion gear

Defective magnetic switch

Repair or replace the magnetic

switch

Brush wear

Weak brush spring

Replace the brush and/or the

brush spring

Engine

Piston, crank bearing seizure,

or other damage

Repair or replace the related

parts

OK

OK

NG

NG

NG

NG

NG

NG

NG

TROUBLESHOOTING 6 – 5

3. ENGINE TURNS OVER BUT DOES NOT START

Checkpoint

Trouble

Cause

Countermeasure

1500010301

FUEL IS NOT BEING DELIVERED TO THE INJECTION PUMP

Engine stop mechanism

Defective fuel cut solenoid

value

Replace the fuel cut solenoid

valve

NG

Fuel

Fuel tank is empty

Fill the fuel tank

Fuel piping

Clogged or damaged fuel lines

Loose fuel line connections

Repair or replace the fuel lines

Retighten the fuel line

connections

Fuel filter

Fuel filter overflow valve does

not close

Repair or replace the fuel filter

overflow valve

Clogged fuel filter element

Replace the fuel filter element

or the fuel filter cartridge

Fuel system

Air in the fuel system

Bleed the air from the fuel

system

Fuel feed pump

Defective feed pump

Repair or replace the feed

pump

OK

OK

OK

OK

NG

NG

NG

NG

NG

NG