Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1324

6E1–372

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

No

Yes

Value(s)

Action

12

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

D

Verify that all ignition wire resistance are less than
the specified value.

D

Verify that ignition wires are correctly routed to
eliminated cross–firing.

D

Verify that ignition wires are not arcing to ground.
Spraying the secondary ignition wires with a light
mist of water may help to locate an intermittent
problem.

Was a problem found?

22.4 

W

Verify repair

Go to Step 13

13

1. Check ignition coil secondary resistance.
2. Replace the coil if it is not within the specified range

of resistance.

Did the coil require replacement?

9 k

W

– 12 k

W

Verify repair

Go to Step 14

14

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 15

15

1. Check the injector connectors.
2. If any of the connectors are connected at an

improper cylinder, correct as necessary.

Was a problem found?

—

Verify repair

Go to Step 16

16

Check the PCM grounds to verify that they are clean
and tight. Refer to the PCM wiring diagrams in
Electrical Diagnosis.

Was a problem found?

—

Verify repair

Go to Step 17

17

Visually/physically check the vacuum hoses for splits,
kinks and  proper connections and routing as shown on
the ”Vehicle Emission Control Information” label.

Was a problem found?

—

Verify repair

Go to Step 18

18

Check the exhaust system for a possible restriction:

D

damaged or collapsed pipes

D

internal muffler failure

D

Refer to Restricted Exhaust System Check to
measure back pressure and determine if the
catalytic converter is plugged.

—

Verify repair

Go to Step 19

19

1. Review all the diagnostic procedures within this

table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

D

Visual/physical inspection.

D

Tech 2 data.

D

Freeze Frame data/Failure Records buffer.

D

All electrical connections within a suspected
circuit and/or system.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E1–373

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

LACK OF POWER, SLUGGISH OR
SPONGY SYMPTOM

DEFINITION:
Engine delivers less than expected power. Little or no
increase in speed when accelerator pedal is pushed down
part–way.

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. 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 

3

Was a visual/physical check performed?

—

Go to Step 4 

Go to Visual /

Physical

Check 

4

1. Remove and check the air filter element for dirt or

restrictions. Refer to Air Intake System in
On–Vehicle Service.

2. Replace the air filter element if necessary.

Was a problem found?

—

Verify repair

Go to Step 5 

5

Check for proper ignition voltage output with the spark
tester J 26792.

Was a problem found?

—

Verify repair

Go to Step 6 

6

1. Remove the spark plugs and check 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 7 

7

Check the fuel pressure. Refer to Fuel System Test.

Was a problem found?

—

Verify repair

Go to Step 8 

8

1. Install the Tech 2.
2. Run the engine at idle.
3. On the Tech 2, select F3: Miscellaneous Test, F6:

Variable Intake Manifold.

4. Repeat Switch ON or OFF of VIM solenoid valve by

using the Tech 2.

5. Check the solenoid working sound.
6. If a problem is found, repair as necessary.

Was a problem found?

—

Verify repair

Go to Step 9

9

Check for water or alcohol contaminated fuel.

Was a problem found?

—

Verify repair

Go to Step 10

10

Check the PCM grounds to verify that they are clean
and tight. Refer to the PCM wiring diagrams in
Electrical Diagnosis.

Was a problem found?

—

Verify repair

Go to Step 11

6E1–374

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

No

Yes

Value(s)

Action

11

Check the exhaust system for a possible restriction:

D

Damaged or collapsed pipes

D

Internal muffler failure

D

Refer to Restricted Exhaust System Check to
measure backpressure and determine if the
catalytic converter is plugged.

Was a problem found?

—

Verify repair

Go to Step 12

12

Check for the following engine mechanical problems:

D

Low compression

D

Leaking cylinder head gasket

D

Worn or incorrect camshaft

D

Loose timing belt

Was a problem found?

—

Verify repair

Go to Step 13

13

1. Review all the diagnostic procedures within this

table.

2. If all procedures have been completed and no

malfunctions have been found, review/inspect the
following:

D

Visual/physical inspection.

D

Tech 2 data

D

Freeze Frame data/Failure Records buffer.

D

All electrical connections within suspected
circuit and/or system.

Was a problem found?

—

Verify repair

Contact

Technical

Assistance

6E1–375

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DETONATION/SPARK KNOCK SYMPTOM

DEFINITION:
A mild to severe ping, usually worse under acceleration.
The engine makes sharp metallic knocks that change
with throttle opening.

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. 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 

3

Was a visual/physical check performed?

—

Go to Step 4 

Go to Visual /

Physical

Check 

4

1. If Tech 2 readings are normal and there are no

engine mechanical faults, fill the fuel tank with a
known quality gasoline that has a minimum octane
rating of 87. Refer to Typical Scan Values. 

2. Re–evaluate the vehicle performance.

Is detonation present?

—

Go to Step 5 

Verify repair

5

1. Check for obvious overheating problems:

D

Low engine coolant.

D

Restricted air flow to radiator, or restricted
water flow through radiator.

D

Incorrect coolant solution. It should be a 50/50
mix of approved antifreeze/water.

D

Incorrect EGR operation. Refer to DTC
P0401. 

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

Was a problem found?

—

Verify repair

Go to Step 6 

6

Check fuel pressure. Refer to Fuel System Pressure
Test.

Was a problem found?

—

Verify repair

Go to Step 7 

7

Check items that can cause an engine to run lean.
Refer to Diagnostic Aids in DTC P0171.

Was a problem found?

—

Verify repair

Go to Step 8 

8

Check spark plugs for proper heat range. Refer to
General Information.

Were incorrect spark plugs installed?

—

Verify repair

Go to Step 9 

9

1. Remove excessive carbon buildup with a top engine

cleaner. Refer to instructions on the top engine
cleaner can.

2. Re–evaluate vehicle performance.

Is detonation still present?

—

Go to Step 10

Verify repair