Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 253

ENGINE DRIVEABILITY AND EMISSIONS

6E–253

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 25

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

—

Step

Action

Value(s)

Yes

6E–254

ENGINE DRIVEABILITY AND EMISSIONS

DIESELING, RUN-ON SYMPTOM

DEFINITIONS: Engine continues to run after key is turned OFF, but runs very rough. If engine runs smoothly, check
the ignition switch and adjustment.

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to OBD

System Check

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

Was a visual/physical check performed?

—

Go to Step 4

Go to Visual /

physical Check.

Check for a short between battery voltage and the
ignition feed circuit.
Was a problem found?

—

Verify repair

Go to Step 5

Check the fuel leaking from injector. Refer to Fuel
System Diagnostic.
Was the problem found?

—

Verify repair

Go to Step 6

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 7

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 8

—

Verify repair

—

ENGINE DRIVEABILITY AND EMISSIONS

6E–255

BACKFIRE SYMPTOM

DEFINITIONS: Fuel ignites in the intake manifold, or in the exhaust system, making a loud popping noise.

Step

Action

Value(s)

Yes

Was the “On-Board Diagnostic (OBD) System Check”
performed?

—

Go to Step 2

Go to OBD

System Check

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

Was a visual/physical check performed?

—

Go to Step 4

Go to Visual /

physical Check.

Check for proper ignition voltage output with the spark
tester.
Was a problem found?

—

Verify repair

Go to Step 5

1. Remove the spark plugs and check for gas or oil

fouling cracks, wear, improper gap, burned
electrodes, heavy deposits, or improper heat
range.

2. If spark plugs are fouled, the cause of fouling must

be determined before replacing the spark plugs.

Was a problem found?

—

Verify repair

Go to Step 6

Visually/physically inspect all spark plug high-tension
cables. Check for the following conditions:

• Verify that the resistance of all spark plug high-

tension cables are less than the specified value.

• Verify that the all spark plug high-tension cables are

correctly fitted to eliminate cross-fitting.

• Verify that the all spark plug high-tension cables are

not arcing to ground.
Spraying the spark plug high-tension cables with a
light mist of water may help locate an intermittent
problem.

Was a problem found?

#1 cyl. 4.4k

Ω

#2 cyl. 3.6k

Ω

#3 cyl. 3.1k

Ω

#4 cyl. 2.8k

Ω

Verify repair

Go to Step 7

Check the fuel pressure. Refer to Fuel System
Pressure Test.
Was a problem found?

—

Verify repair

Go to Step 8

Check for an intermittent ignition system malfunction:

• Intermittent CKP 58X signal

• Intermittent ignition feed circuit or sensor ground

circuit to the crankshaft position sensor.

Was a problem found?

—

Verify repair

Go to Step 9

Refer to Fuel System Diagnosis to determine if there
is a problem with fuel delivery.
Was a problem found?

—

Verify repair

Go to Step 10

6E–256

ENGINE DRIVEABILITY AND EMISSIONS

Check for the following engine mechanical problems
(refer to Engine Mechanical):

• Low compression

• Leaking cylinder head gaskets

• Worn camshaft

• Sticking or leaking valves

• Valve timing

• Broken valve springs

• Camshaft drive belt slipped or stripped
Was a problem found?

—

Verify repair

Go to Step 11

Check leakage at exhaust system.
Check the intake and exhaust manifold for casting
flash. Refer to Engine Mechanical.
Was a problem found?

—

Verify repair

Go to Step 12

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 13

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 14

—

Verify repair

—

Step

Action

Value(s)

Yes

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