Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Instruction - page 87

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–343

27

Using the vacuum pump and check the exhaust
throttle valve (if equipped) operation for the following
condition.

• Restrict shaft movement. Check for objects sticking

the shaft, broken diaphragm or excessive carbon
deposit.

Was a problem found?

Verify repair

Go to Step 28

28

Check the exhaust system for a possible restriction.

• Damaged or collapsed pipes or catalytic converter.

• Internal muffler failure.
If a problem is found, repair as necessary.
Was a problem found?

Verify repair

Go to Step 29

29

Visually/physically inspect for the following conditions.

• Restrict fuel supply system. Check for a pinched

fuel hose/pipe.

• Check for a condition that causes fuel waxing or

icing, such as the customer is using an incorrect
fuel type in winter season or water mixed with the
fuel.

If a problem is found, repair as necessary.
Was a problem found?

Verify repair

Go to Step 30

30

Replace the fuel filter.
Was the problem solved?

Verify repair

Go to Step 31

Step

Action

Value(s)

Yes

No

6E–344

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

31

Remove the eye bolt with gauze filter from the
injection pump and check for the following conditions.

• Objects blocking at the gauze filter. Check for a

condition that causes contaminated fuel, such as
the customer is using an aftermarket fuel filter or
extended maintenance interval.

• Check for a condition that causes fuel waxing or

icing, such as the customer is using an incorrect
fuel type in winter season or water mixed with the
fuel.

If a problem is found, repair as necessary.
Was the problem found?

Replace the eye

bolt with gauze

filter and verify

repair

Go to Step 32

32

Remove the injection nozzles from the engine and
check for the following conditions.

• Improper splay condition.

• Operating pressure is incorrect.
If a problem is found, repair as necessary.
Was the problem found?

Replace the

injection nozzle

and verify repair

Go to Step 33

33

Check the engine compression pressure for each
cylinders.
If a problem is found, repair as necessary.
Was the problem found?

More than 30

Mpa (31.0 kg/

cm

2

)

Verify repair

Go to Step 34

Step

Action

Value(s)

Yes

No

1

st

Stage

2

nd

Stage

4JA1-TC

19.5 - 20.5 Mpa

(199 -209 kg/cm

2

)

34.0 - 35.5 Mpa

(347 - 362 kg/cm

2

)

4JH1-TC

20.0 - 21.0 Mpa

(204 -214 kg/cm

2

)

34.3 - 35.8 Mpa

(350 - 365 kg/cm

2

)

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

6E–345

34

Check the inlet/exhaust valve clearance for each
valves.
Are the valve clearances within the specified value?

0.4mm at cold

(In/Ex)

Go to Step 35

Adjust and

verify repair

35

1. Review all diagnostic procedures within this table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

• Visual/physical inspection

• Tech 2 data

• All electrical connections within a suspected circuit

and/or system

Was a problem found?

Verify repair

Go to Step 36

36

Is the ECM programmed with the latest software
release?
If not, download the latest software to the ECM using
the “SPS (Service Programming System)”.
Was the problem solved?

Verify repair

Go to Step 37

37

Substitute a known good ECM and recheck.
Was the problem solved?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

Go to Step 38

Go to Step 39

38

Replace the ECM.
Is the action complete?
IMPORTANT: The replacement ECM must be
programmed. Refer to section of the Service
Programming System (SPS) in this manual.
Following ECM programming, the immobiliser system
(if equipped) must be linked to the ECM. Refer to
section 11 “Immobiliser System-ECM replacement” for
the ECM/Immobiliser linking procedure.

Verify repair

39

Replace the injection pump assembly.
Is the action complete?

Verify repair

Step

Action

Value(s)

Yes

No

6E–346

4JA1-TC/4JH1-TC ENGINE DRIVEABILITY AND EMISSIONS

SURGES AND/OR CHUGS SYMPTOM

DEFINITIONS: Engine power variation under steady
throttle or cruise. Feels like the vehicle speeds up and
slows down with no charge in the accelerator pedal.

time

rpm

Surge

Step

Action

Value(s)

Yes

No

1

Was the “On-Board Diagnostic (OBD) System Check”
performed?

Go to Step 2

Go to On Board

Diagnostic

(OBD) System

Check

2

1. Perform a bulletin search.

2. If a bulletin that addresses the symptom is found,

correct the condition as instructed in the bulletin.

Was a bulletin found that addresses the symptom?

Verify repair

Go to Step 3

3

Was a visually/physical check performed?

Go to Step 4

Go to Visual /

physical Check

4

Is the customer using the incorrect fuel type?

Diesel fuel

only

Replace with

diesel fuel

Go to Step 5

5

Visually/physically inspect for the following conditions.

• Restrict air intake system. Check for a restricted air

filter element, or foreign objects blocking the air
intake system

• Check for objects blocking or excessive deposits in

the throttle bore and on the throttle plate

• Check for a condition that causes a large vacuum

leak, such as an incorrectly installed or faulty
crankcase ventilation hose.

• Restrict air intake system at the turbocharger.

Check for objects blocking the turbocharger
compressor wheel or turbine shaft sticking.

If a problem is found, repair as necessary.
Was a problem found?

Verify repair

Go to Step 6

6

Check the ECM & PSG grounds to verify that they are
clean and tight. Refer to the ECM wiring diagrams.
Was a problem found?

Verify repair

Go to Step 7

7

1. Using the Tech 2, ignition “On” and engine “Run”.

2. Monitor the “A/C Information Switch” in the data

display.

Does the Tech 2 indicate correct “A/C Information
Switch” status depending on A/C switch position?
If a problem is found, repair as necessary.
Was the problem found?

Verify repair

Go to Step 8

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