Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 186

6E–348

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

19

Substitute a known good CKP sensor and recheck. 
Was the problem solved?

—

Go to Step 20

Go to Step 21

20

Replace the CKP sensor. 
Is the action complete?

—

Verify repair

—

21

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

“Run”. 

2. Monitor the following parameters in the data

display. 

• “Desired Injection Quantity” & “Injection Quantity” 

• “Desired Injection Start” &  “Actual Injection Start”

Are the large gap or unstable parameter displayed
between “Desired” and “Actual”?

—

Go to Step 23

Go to Step 22

22

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 23

23

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 24

24

Replace the fuel filter. 
Was the problem solved?

—

Verify repair

Go to Step 25

Step

Action

Value(s)

Yes

No

                  When idling or part-throttle                                            When accelerated

                                                                                     

                                                                                   

High

Desired

Low

Time

    Actual

High

Low

Desired

    Actual

Time

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–349

25

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 26

26

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 27

27

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 28

Step

Action

Value(s)

Yes

No

1

st

 Stage

2

nd

 Stage

20.0 - 21.0 Mpa

(204 - 214 kg/cm

2

)

34.3 - 35.8 Mpa

(350 - 365 kg/cm

2

)

6E–350

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

28

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 29

Adjust and 

verify repair

29

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 30

30

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 31

31

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 32

Go to Step 33

32

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

—

33

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

No

4JH1 ENGINE DRIVEABILITY AND EMISSIONS

6E–351

EXCESSIVE BLACK SMOKE

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, display the ECT sensor and IAT

sensor value. 

2. Check the displayed value. 

Does the Tech 2 indicate correct temperature
depending on engine condition? 
If a problem is found, repair as necessary. 
Was the problem found?

—

Verify repair

Go to Step 8

8

1. Using the Tech 2, display the FT sensor value. 

2. Check the displayed value. 

Does the Tech 2 indicate correct temperature
depending on engine condition? 
If a problem is found, repair as necessary. 
Was the problem found?

—

Go to Step 22

Go to Step 9

9

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

2. Monitor the “Mass Air Flow” in the data display. 

Does the Tech 2 indicate correct “Mass Air Flow”
depending on accelerator pedal operation? 

—

Go to Step 14

Go to Step 10