Content .. 93 94 95 96 ..

Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 95

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

6E–375

Substitute a known good MAF & IAT sensor assembly
and recheck.
Was the problem solved?

—

Go to Step 13

Go to Step 30

Replace the MAF & IAT sensor assembly.
Is the action complete?

—

Verify repair

—

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

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 engine “Run”?
If a problem is found, repair as necessary.
Was the problem found?

—

Go to Step 30

Go to Step 15

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

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 16

Repair voltage

supply circuit

and verify repair

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

—

Verify repair

Go to Step 17

Remove the CKP sensor from the flywheel housing
and check for the following conditions.

• Objects sticking the CKP sensor.

• Objects sticking the CKP sensor pulser.
If a problem is found, repair as necessary.
Was the problem found?

—

Verify repair

Go to Step 18

Check the CKP sensor harness for the following
conditions.

• Check for poor connector connection.

• Check for misrouted harness.

• Check for any accessory parts which may cause

electric interference.

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

—

Verify repair

Go to Step 19

Step

Action

Value(s)

Yes

6E–376

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

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

—

Go to Step 20

Go to Step 21

Replace the CKP sensor.
Is the action complete?

—

Verify repair

—

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

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

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

Replace the fuel filter.
Was the problem solved?

—

Verify repair

Go to Step 25

Step

Action

Value(s)

Yes

When idling or part-throttle When accelerated

High

Desired

Low

Time

Actual

High

Low

Desired

Actual

Time

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

6E–377

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

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

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/

)

Verify repair

Go to Step 28

Step

Action

Value(s)

Yes

Stage

4JA1-TC

19.5 - 20.5 Mpa

(199 -209 kg/cm

)

34.0 - 35.5 Mpa

(347 - 362 kg/cm

)

4JH1-TC

20.0 - 21.0 Mpa

(204 -214 kg/cm

)

34.3 - 35.8 Mpa

(350 - 365 kg/cm

)

6E–378

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

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

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

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

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

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

—

Replace the injection pump assembly.
Is the action complete?

—

Verify repair

—

Step

Action

Value(s)

Yes

Content .. 93 94 95 96 ..