Isuzu D-Max / Isuzu Rodeo (TFR/TFS). Manual - part 832

6E–57

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Malfunction Indicator Lamp (MIL) “ON” Steady

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

1. Ignition “OFF,” disconnect ECM.
2. Ignition “ON,” observe the MIL (Service Engine

Soon lamp).

Is the MIL “ON?”

—

Go to 

Step 3

Go to 

Step 5

3

1. Ignition “OFF,” disconnect the instrument panel

cluster.

2. Check the MIL driver circuit between the ECM and

the instrument panel cluster for a short to ground.

3. If a problem is found, repair as necessary.

Was the MIL driver circuit shorted to ground?

—

Go to 

OBD

System

Check

Go to 

Step 4

4

Replace the instrument panel cluster.

Is the action complete?

—

Go to 

OBD

System

Check

—

5

1. Ignition “OFF,” reconnect the ECM.
2. Ignition “ON,” reprogram the ECM. Refer to

On-Vehicle Service  in Engine Control Module and
Sensor for procedures.

3. Using the Tech 2 output controls function, select

MIL dash lamp control and command the MIL
“OFF.”

Did the MIL turn “OFF?”

—

Go to 

OBD

System

Check

Go to 

Step 6

6

Replace the ECM.

Is the action complete?

—

Go to 

OBD

System

Check

—

6E–58

3.2L ENGINE DRIVEABILITY AND EMISSIONS

060RW051

6E–59

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

Circuit Description

The electronic Ignition system uses a coil-at-plug method
of spark distribution.  In this type of ignition system, the
Engine Control Module ECM triggers the correct driver
inside the ignition coil, which then triggers the correct
ignition coil based on the 58X signal received from the
crankshaft position sensor (CKP).  The spark plug
connected to the coil fires when the ignition coil opens the
ground circuit for the coil’s primary circuit.
During crank, the ECM monitors the CKP 58X signal.  The
CKP signal is used to determine which cylinder will fire
first.  After the CKP 58X signal has been processed by the
ECM, it will command all six injectors to allow a priming
shot of fuel for all the cylinders.  After the priming, the
injectors are left “OFF” during the next six 58X reference
pulses from the CKP.  This allows each cylinder a chance
to use the fuel from the priming shot.  During this waiting
period, a camshaft position (CMP) signal pulse will have
been received by the ECM.  The CMP signal allows the
ECM to operate the injectors sequentially based on
camshaft position.  If the camshaft position signal is not
present at start-up, the ECM will begin sequential fuel
delivery with a 1-in-6 chance that fuel delivery is correct.
The engine will run without a CMP signal, but will set a
DTC code.

Diagnostic Aids

An intermittent problem may be caused by a poor
connection, rubbed-through wire insulation or a wire
broken inside the insulation.  Check for the following
items:

D

Poor connection or damaged harness – Inspect the
ECM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal-to-wore connection, and
damaged harness.

D

Faulty engine coolant temperature sensor – Using a
Tech 2, compare engine coolant temperature with
intake air temperature on a completely cool engine.
Engine coolant temperature should be within 10

°

C of

intake air temperature.  If not, replace the ECT sensor.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart.
5. An obvious cause of low fuel pressure would be an

empty fuel tank.

6. The engine will easily start and run if a few injectors

are disabled.  It is not necessary to test all injectors
at this time since this step is only a test to verify that
all of the injectors have not been disabled by fuel
contamination.

7. A blinking test light verifies that the ECM is

monitoring the crankshaft reference signal and is
capable of activating the injectors.  If there is an
open or shorted driver circuit, DTCs 201–206 should
be set.

19.By using a spark tester, each ignition coil’s ability to

produce 25,000 volts is verified.

25.If there is an open or shorted driver circuit, DTCs

201-206 should be set.  All six injector driver circuits
can be checked at one time without removing the
intake manifold if a 5–8840–2639–0 test light is
available.  This is the alternative procedure:

D

With the ignition “OFF,” disconnect the gray
connector located at the rear of the air filter, attached
to a bracket on the purge canister.

D

Connect test light 5–8840–2639–0 to the connector.
Do any of the light constantly illuminate or fail to blink
when the engine is cranked?  If so, repair the short or
open circuit, or replace the ECM if indicated.

This procedure only tests the driver circuit as far as the
test connection, so step 31 is added to test the circuit all
the way to the injector.

Engine Cranks But Will Not Run

 

Step

Action

Value(s)

Yes

No

1

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

—

Go to 

Step 2

Go to 

OBD

System

Check

2

Check the 15 A ignition coil fuse, the 15 A engine
device fuse, and the 15A ECM fuse.

Was a fuse blown?

—

Go to 

Step 3

Go to 

Step 4

3

Check for a short to ground and replace the fuse.

Is the action complete?

—

Verify repair

—

6E–60

3.2L ENGINE DRIVEABILITY AND EMISSIONS

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

4

1. Ignition “OFF,” install a fuel pressure gauge at the

test fitting on the fuel supply line in the engine
compartment.  (Use a shop cloth to absorb any fuel
leakage while making the connection.)

2. Ignition “ON,” observe the fuel pressure.

Is the fuel pressure within the specified values, and
does it hold steady?

285-375 kpa

(43-55 psi)

Go to 

Step 6

Go to 

Step 5

5

Is any fuel pressure indicated?

—

Go to 

Fuel

System

Electrical Test

Go to 

Fuel

System

Diagnosis

6

Install the switch box 5–8840–2618–0 at the injector
test connector and activate an injector.

Did the fuel pressure drop when the injector was
activated?

—

Go to 

Step 7

Go to 

Step 18

7

Install an injector test light at the #2 cylinder injector
harness connector.

Does the light blink when the engine is cranked?

—

Go to 

Step 8

Go to 

Step 24

8

1. Ignition “OFF.”
2. Disconnect the 6-pin connector at the ignition coil.
3. With a test light to B+, probe each of the 6 exposed

ignition module pins, one at a time, while the engine
is cranked.  (Use the gray narrow METRA–PAK



flexible female connector from the 5-8840-0385-0
kit to make the pin accessible.)

Does the light flash at each pin when the engine is
cranked?

—

Go to 

Step 12

Go to 

Step 9

9

1. Remove the 5-pin connector at the ignition coil.
2. Ignition “ON.”
3. Use a test light at the harness connector to verify

that the module is being supplied with B+ and
ground.

Was a problem found?

—

Go to 

Step 10

Go to 

Step 11

10

Repair the open ignition feed circuit or ground circuit to
the ignition coil.

Is the action complete?

—

Verify repair

—

11

Repair the ignition module.

Is the action complete?

—

Verify repair

—

12

1. Reconnect the ignition coil connector.
2. Remove the electrical connector from each coil.
3. With a test light to B+, probe each of the coil

connectors at the wire which runs to the ignition
module.  (Wire color will match the wire color at the
ignition module 6-pin connector – green, or green
with a tracer.)

Does the light flash at each coil connector when the
engine is cranked?

—

Go to 

Step 14

Go to 

Step 13

13

Check for an open circuit between the ignition coil.

Is the action complete?

—

Verify repair

—