Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1254

6E1–92

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

20

Replace the coil–to–spark plug secondary ignition wire
and any other secondary wires which exceed the
specified value.

Is there still a problem?

10,000 

W

 per

foot

Go to Step 21

Verify repair

21

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
excessing fouling?

—

Correct the

fouling

condition

Go to Step 33

22

Verfiy repair.
Attempt to start the engine.

Is there still a problem?

—

Go to Step 23

Go to Step 22

23

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

fitting on the fuel supply line in the engine
compartment.

CAUTION: Use a shop cloth to absorb any fuel
leakage while making the connection.

2. Check the engine and observe the fuel pressure.

Is the fuel pressure within the specified values, and
does it hold steady for 2 seconds?

285–375 kPa

(43–55 psi)

Go to Step 25

Go to Step 24

24

Is any fuel pressure indicated?

—

Go to Fuel

System

Electrical Test

Go to Fuel

System

Diagnosis 

25

1. Install switch box J 39021–2 and J 39021–90 at the

injector test connector.

2. Activate an injector.

Did the fuel pressure drop when the injector was
activated?

—

Go to Step 26

Go to Fuel

System

Diagnosis 

26

Pressurize the fuel system using the ignition ON and
use the injector switch box to test pressure drop for
each injector.

Was there a pressure drop when each injector was
activated?

—

Go to Step 27

Go to Fuel

System

Diagnosis 

27

1. Remove the switch box and install an injector test

light J 39021–45 at the injector test harness
connector.

2. Crank the engine.

Are any of the lights blinking when the engine is
cranked?

—

Go to Step 33

Go to Step 28

28

1. Raise the vehicle and disconnect the CKP sensor

harness.

2. Ignition ON.
3. With a test light to ground, probe the CKP ignition

feed harness terminal.

Did the light illuminate?

—

Go to Step 29

Go to Step 30

6E1–93

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Engine Cranks But Will Not Run

  (Cont'd)

Step

No

Yes

Value(s)

Action

29

1. Ignition ON.
2. At the CKP harness connector, connect a test lamp

between the ignition and ground terminals.

Did the lamp illuminate?

—

Go to Step 31

Go to Step 32

30

Check the CKP High circuit between the sensor and the
PCM for a short to ground or open circuit.

Was a problem found?

—

Verify repair

Go to Step 33

31

Replace the CKP position sensor.

Is there still a problem?

—

Go to Step 34

—

32

Check the CKP Low circuit between the sensor and the
PCM for: an open circuit, a short to ground, or short to
voltage.

Was the problem found?

—

Verify repair

Go to Step 33

33

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.

—

Verify repair

—

34

1. Test the fuel for contamination.
2. If a problem is found, clean the fuel system and

correct the contaminated fuel condition as
necessary. Replace the fuel filter and replace any
injectors that are not delivering fuel (see Injector
Balance Test).

Was a problem found?

—

Verify repair

Go to Step 35

35

To diagnose the following conditions, refer to Engine
Mechanical:

D

Slipped camshaft drive belt.

D

Leaking or sticky valves or rings.

D

Excessive valve deposits.

D

Loose or worn rocker arms.

D

Weak valve springs

D

Leaking head gasket.

Is the action complete?

—

Verify repair

—

6E1–94

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

FUEL SYSTEM ELECTRICAL TEST

060R100024

Circuit Description

When the ignition switch is first turned ON, the powertrain
control module (PCM) energizes the fuel pump relay
which applies power to the in–tank fuel pump. The fuel
pump relay will remain ON as long as the engine is
running or cranking and the PCM is receiving 58X
crankshaft position pulses. If no 58X crankshaft position
pulses are present, the PCM de–energizes the fuel pump
relay within 2 seconds after the ignition is turned ON or the
engine is stopped.
The fuel pump delivers fuel to the fuel rail and injectors,
then to the fuel pressure regulator. The fuel pressure
regulator controls fuel pressure by allowing excess fuel  to
be returned to the fuel tank. With the engine stopped and
ignition ON, the fuel pump can be turned ON by using a
command by the Tech 2.

Diagnostic Aids

An intermittent 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.

Test Description

Number(s) below refer to the step number(s) on the
Diagnostic Chart:
2. If the fuel pump is operating but incorrect pressure

is noted, the fuel pump wiring is OK and the ”Fuel
System Pressure Test” chart should be used for
diagnosis.

6E1–95

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

CAUTION: To reduce the risk of fire and personal
injury:

D

It is necessary to relieve fuel system pressure
before connecting a fuel pressure gauge. Refer to
Fuel Pressure Relief Procedure, below. 

D

A small amount of fuel may be released when
disconnecting the fuel lines. Cover fuel line
fittings with a shop towel before disconnecting, to
catch any fuel that may leak out. Place the towel in
an approved container when the procedure is
completed.

Fuel Pressure Relief Procedure

1. Remove the fuel cap.

2. Remove the fuel pump relay from the underhood

relay center.

3. Start the engine and allow it to stall.
4. Crank the engine for an additional 3 seconds.

Fuel Gauge Installation

1. Remove the shoulder fitting cap.
2. Install fuel gauge J 34730–1 to the fuel feed line

located in front of and above the right side valve
cover.

3. Reinstall the fuel pump relay.

Fuel System Electrical Test

 

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. Read the ”Caution” above.
2. Relieve the fuel system pressure and install the fuel

pump pressure gauge to the test fitting.

3. Use a Tech 2 to command the fuel pump ON.

Is there an immediate pressure build–up which
indicates the pump is running?

—

Go to Step 3 

Go to Step 4 

3

1. Verify that the pump is not running by removing the

fuel filler cap and listening.

2. Command the pump ON with the Tech 2.

Did the pump turn OFF after 2 seconds?

—

Test

completed

Go to Step 12

4

1. Ignition OFF.
2. Remove the fuel pump relay.
3. Ignition SW “On”, Engin “Off”.
4. Using a test light connected to ground, probe the

battery feed to the relay.

Did the light illuminate?

—

Go to Step 6 

Go to Step 5 

5

Repair short or open battery feed to fuel pump relay.

Is the action complete?

—

Verify repair

—

6

1. Connect a test light between the two wires that

connect to the fuel pump relay pull–in coil.

2. Ignition ON.

Did the test light illuminate for 2 seconds and then turn
off?

—

Go to Step 12

Go to Step 7 

7

1. With a test light connected to battery (–), probe the

fuel pump relay connector at the wire which runs
from the relay pull–in coil to the PCM.

2. Ignition ON.

Did the test light illuminate for 2 seconds and then turn
off?

—

Go to Step 8 

Go to Step 9 

8

Locate and repair open in the fuel pump relay ground
circuit.

Is the action complete?

—

Verify repair

—