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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