Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 85

 

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Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 85

 

 

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

6E–335

HARD START SYMPTOM

DEFINITIONS: Engine cranks, but does not start for a long time. Does eventually start, or may start and then
immediately stall.

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 6

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 20

Go to Step 9

9

1. Using the Tech 2, ignition “On”. 

2. Monitor the “Glow Time Relay” in the data display. 

Does the Tech 2 indicate correct “Glow Time Relay”
status depending on the time from ignition switch
“On”? 
If a problem is found, repair as necessary. 
Was the problem found?

—

Go to Step 20

Go to Step 10

6E–336

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

10

1. Using the Tech 2, ignition “On”. 

2. Monitor the “Glow Time Relay” in the data display

and then, does the supply voltage correctly supply
to the glow plug? 

—

Go to Step 11

Repair voltage 

supply circuit 

and verify repair

11

Check the glow plugs for continuity. 
If a problem is found, repair as necessary. 
Was a problem found?

—

Verify repair

Go to Step 12

12

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 13

13

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 14

14

Replace the fuel filter. 
Was the problem solved?

—

Verify repair

Go to Step 15

Step

Action

Value(s)

Yes

No

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

6E–337

15

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 16

16

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 17

17

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 18

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

)

6E–338

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

18

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 19

Adjust and 

verify repair

19

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 20

20

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 21

21

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 22

Go to Step 23

22

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

—

23

Replace the injection pump assembly. 
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

No

 

 

 

 

 

 

 

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