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
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