Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 246

ENGINE DRIVEABILITY AND EMISSIONS

6E–225

ENGINE CRANKS BUT WILL NOT RUN

DEFINITIONS: Engine cranks, but will not run. (The engine never start.)
NOTE: 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.
NOTE: The vehicle with immobiliser system, this system may be activated. Check the immobiliser system diagosis.

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 visually/physical check performed?

—

Go to Step 4

Go to Visual /

physical Check.

Check the “Ignition coil” fuse (15A) and “ECM” fuse
(15A).
Was a fuse blown?

—

Verify repair

Go to Step 5

1. Ignition ON

2. Use a DVM to verify that battery voltage at the

ignition coil fuse, and the ECM fuse.

Was battery voltage presented at the fuses?

—

Go to Step 6

Verify & repair

1. Visually/physically inspect for the following

conditions:

• Restriction of air intake system. Check for a

restricted air filter element, or foreign objects
blocking the air intake system.

• Check for objects blocking the IAC passage or

throttle bore, 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/brake booster
hose.

Was a problem found?

—

Verify repair

Go to Step 7

1. Using a Tech 2, display the IAC value.

2. Check for a faulty, plugged, or sticking IAC

operation.

Was the problem found?

—

Verify repair

Go to Step 8

1. Using a Tech 2, display the MAP sensor value.

2. Check for a faulty, plugged, or incorrectly installed

MAP sensor.

Was the problem found?

—

Verify repair

Go to Step 9

If oscilloscope is available, check the wave form of the
CKP signal.
Was the correct wave form found?

—

Go to Step 12

Go to Step 10

Check the CKP sensor wire for open or short circuit.
Was a problem found?

—

Verify repair

Go to Step 11

Replace CKP sensor.
Is there still problem?

—

Replace pulsar

ring.

Verify repair

6E–226

ENGINE DRIVEABILITY AND EMISSIONS

Visually/physically inspect the secondary ignition
wires. Check for the following conditions:

• Verify that all ignition wire resistance are less than

the specified value.

• Verify that ignition wires are correctly routed to

eliminate cross-fitting.

• Verify that ignition wires are not arcing to ground.

Spraying the secondary ignition wires 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 13

1. Disconnect the spark plug high tension cable from

No.1 spark plug.

2. Install a spark tester at the end of the

disconnected ignition coil.

3. Clip the spark tester to a good ground.

4. Observe the spark tester while the engine is

cranking.

Was a crisp blue spark observed? (Only one or two
sparks followed by no result is considered the same
as “No Spark”.)

—

Go to Step 21

Go to Step 14

1. Disconnect the ignition coil harness connector.

2. Check for an open or short circuit between the

ignition coil and the ECM.

Was a problem found?

—

Verify repair

Go to Step 15

1. Ignition “On”.

2. Using a Digital Voltmeter (DVM) check the ignition

wire coil at the ignition coil harness connector.

Was the voltage equal to the specified value?

Battery
voltage

Go to Step 16

Verify repair

1. Ignition “Off”.

2. With DVM, check for an open in the ground wire at

the ignition coil harness connector.

Was the ground wire OK?

—

Go to Step 17

Verify repair

Replace the ignition coil, verify the repair.
Attempt to start the engine.
Is there still a problem?

—

Go to Step 18

Verify repair

Use an ohmmeter to check the ignition coil primary
winding resistance.
Was the primary winding resistance approximately
equal to the specified value?

0.8-18k

Ω

Go to Step 19

Go to Step 20

Use an ohmmeter to check the ignition coil secondary
winding resistance.
Was the primary winding resistance hear around the
to the specified value?

2.5k

Ω

Go to Step 21

Go to Step 20

Replace the ignition coil.

—

Verify repair

—

1. Remove the spark plugs from all cylinders.

2. Visually inspect the spark plug electrodes.

3. Replace any spark plugs with loose or missing

electrodes or cracked insulators.

Did your inspection reveal any spark plugs exhibiting
excessive fouling?

—

Correct the

fouling

condition

Go to Step 22

Step

Action

Value(s)

Yes

ENGINE DRIVEABILITY AND EMISSIONS

6E–227

Perform the procedure in Fuel System Pressure Test
to determine if there is a problem with fuel delivery.
Was a problem found?

—

Verify repair

Go to Step 23

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

—

Verify repair

Go to Step 24

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

• Low compression

• Leaking cylinder head gaskets

• Worn camshaft

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

—

Verify repair

Go to Step 25

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 26

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 27

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–228

ENGINE DRIVEABILITY AND EMISSIONS

HARD START SYMPTOM

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

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 visually/physical check performed?

—

Go to Step 4

Go to Visual /

physical Check.

1. Visually/physically inspect for the following

conditions:

• Restriction of air intake system. Check for a

restricted air filter element, or foreign objects
blocking the air intake system

• Check for objects blocking the IAC passage or

throttle bore, 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/brake booster
hose.

Was a problem found?

—

Verify repair

Go to Step 5

1. Using a Tech 2, display the IAC value.

2. Check for a faulty, plugged, or sticking IAC

operation.

Was the problem found?

—

Verify repair

Go to Step 6

Check engine coolant temperature (ECT) sensor for
shift in value.

1. After 8 hours with hood up and the engine not

running, connect the Tech 2.

2. Ignition On, engine not running.

3. Using Tech 2, compare Engine Coolant

Temperature to Intake Air Temperature.

Are ECT and IAT within the specified value of each
other?

±5°C

Go to Step 8

Go to Step 7

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