Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1253

6E1–88

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

ENGINE CRANKS BUT WILL NOT RUN

060R100005

6E1–89

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

060R100004

6E1–90

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Circuit Description

The electronic ignition system uses a dual coil method of
spark distribution. In this type of ignition system, the
powertrain control module (PCM) triggers the correct
driver inside the ignition control module (ICM), 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 ICM opens
the ground circuit for the coil’s primary circuit.
During crank, the PCM 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
PCM, it will command all four injectors to allow a priming
shot of fuel for all the cylinders. After the priming, the
injectors are left OFF during the next four 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 PCM. The CMP signal allows the
PCM to operate the injectors sequentially based on
camshaft position. If the camshaft position signal is not

present at start–up, the PCM will begin sequential fuel
delivery with a 1–in–4 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
PCM harness and connectors for improper mating,
broken locks, improperly formed or damaged
terminals, poor terminal–to–wire 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.

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

Use the Tech 2 and check for any DTC’s.

Are any DTC’s stored?

—

Go to

Applicable

DTC Table

Go to Step 3 

3

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

Was a fuse blown?

—

Go to Step 4 

Go to Step 5 

4

Check for a short to ground and replace the fuse.

Is the action complete?

—

Verify repair

—

5

1. Ignition ON.
2. Use a grounded test lamp to verify that B+ is

available at the ignition coil fuse, the engine device
fuse, and the ECM fuse.

Was B+ available at the fuses?

—

Go to Step 7 

Go to Step 6 

6

Repair the open ignition feed circuit.

—

Go to Fuel

System

Electrical Test

Go to Fuel

System

Diagnosis 

7

1. Disconnect the ignition secondary wire at the No.1.
2. Install a spark tester J 26792 at the end of the

disconnected ignition coil.

3. Clip the spark tester J 26792 to a good ground (not

near the battery).

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 16

Go to Step 8 

6E1–91

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

8

1. Disconnect the ignition module harness connector.
2. Check for an open or short circuit between the

ignition control module and the PCM?

Was a problem found?

—

Go to Step 9 

Go to Step 10

9

Repair the faulty circuit.

—

Verify repair

—

10

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

wire coil at the ignition module harness connector?

Was the voltage equal to the specified value?

B+

Go to Step 12

Go to Step 11

11

Repair the open circuit.

—

Verify repair

—

12

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

the ignition module harness connector.

Was the ground wire OK?

—

Go to Step 14

Go to Step 13

13

Repair the faulty wire.

—

Verify repair

—

14

Replace the ignition module, verify the repair.
 Attempt to start the engine.

Is there still a problem?

—

Go to Step 15

Verify repair

15

Replace the PCM.

IMPORTANT: The replacement PCM must be
programmed. Refer to On–Vehicle Service in
Powertrain Control Module and Sensors for
procedures. 

and also refer to latest service bulletin.
Check to see if the Latest software is released or not.
And then Down Load the LATEST PROGRAMMED
SOFTWARE to the replacement PCM.

Is the action complete?

—

Verify repair

—

16

Use an ohmmeter to check the ignition coil primary
winding resistance.

Was the primary winding resistance approximately
equal to the specified value?

0.8–18 

W

Go to Step 17

Go to Step 18

17

Use an ohmmeter to check the ignition coil secondary
winding resistance.

Was the secondary winding resistance equal to the
specified value?

9,000–12,000

W

Go to Step 19

Go to Step 18

18

Replace the ignition coil.

—

Verify repair

—

19

Test the resistance of the coil–to–spark plug secondary
ignition wire.

Was the resistance greater than the specified value?

10,000 

W

 per

foot

Go to Step 20

Go to Step 21