Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Manual - part 1326

6E1–380

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

No

Yes

Value(s)

Action

12

Check for excessive exhaust system back–pressure.
Refer to Restricted Exhaust System Check. Possible
problems could be:

D

Damaged or collapsed pipes.

D

Internal muffler failure.

D

Plugged catalytic converter.

Was a problem found?

—

Verify repair

Go to Step 13

13

Check for proper calibration of the speedometer.

Does the speed indicated on the speedometer closely
match the vehicle speed displayed on the Tech 2?

—

Go to Step 15

Go to Step 14

14

Diagnose and repair the inaccurate speedometer
condition as necessary. Refer to Vehicle Speed Sensor
in Electrical Diagnosis.

—

Verify repair

—

15

Check the air intake system and the crankcase for air
leaks.

Was a problem found?

—

Verify repair

Go to Step 16

16

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 connections within a suspected circuit
and/or system

Was a problem found?

—

Verify repair

Go to Step 17

17

Perform the procedure in Fuel System Pressure Test.

Was the fuel pressure normal?

—

Contact

Technical

Assistance

Verify repair

6E1–381

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

EXCESSIVE EXHAUST EMISSIONS OR
ODORS SYMPTOM

DEFINITION:
Vehicle fails an emission test. There is excessive ”rotten
egg” smell. (Excessive odors do not necessarily indicate
excessive emissions.)

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?

—

Go to Step 13

Go to Step 3 

3

Was visual/physical check performed?

—

Go to Step 4 

Go to Visual /

Physical

Check 

4

Check for vacuum leaks (vacuum lines, intake
manifold, throttle body, etc.)

Were any vacuum leaks found?

—

Go to Step 13

Go to Step 5 

5

1. Check fuel cap for proper installation.
2. Secure the fuel cap if necessary.

Was a problem found?

—

Go to Step 13

Go to Step 6 

6

1. Check the fuel pressure. Refer to Fuel System

Pressure Test. 

Was a problem found?

—

Go to Step 13

Go to Step 7 

7

1. Check for faulty, plugged or incorrectly installed

PCV valve.

2. Verify that the PCV system is not plugged.

Was a problem found?

—

Go to Step 13

Go to Step 8 

8

Check the injector connections. If any of the injectors
are connected to an incorrect cylinder, correct as
necessary.

Was a problem found?

—

Go to Step 13

Go to Step 9 

9

Perform the Injector Coil/Balance Test.

Was a problem found?

—

Go to Step 13

Go to Step 10

10

Check for a problem with the engine cooling system.

Was a problem found?

—

Go to Step 13

Go to Step 11

11

Check the EVAP canister for fuel loading. Refer to
Evaporative Emission Control System.

Was a problem found?

—

Go to Step 13

Go to Step 12

12

1. Remove excessive carbon build-up with a top

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

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 14

13

Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 14

14

Does the exhaust emission test indicate excessive HC
levels, or is ”Long Term Fuel Trim” significantly in the
negative range (rich condition)?

—

Go to Step 15

Go to Step 16

6E1–382

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

Step

No

Yes

Value(s)

Action

15

1. Check items that can cause the engine to run rich.

Refer to Diagnostic Aids in DTC P0172 Diagnostic
Support. 

Make any necessary repairs.

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 17

16

1. Check items that can cause the engine to run lean.

Refer to Diagnostic Aids in DTC P0171. 

Make any necessary repairs.

2. Perform the exhaust emission test.

Does the vehicle pass the test?

—

System OK

Go to Step 17

17

Check the EGR system (refer to DTC P0401).

Was a problem found?

—

Verify repair

Go to Step 18

18

Check for the following engine mechanical problems.

D

Low compression

D

Leaking cylinder head gasket

D

Worn or incorrect camshaft

D

Sticking or leaking valves

D

Valve timing

D

Broken Valve springs

Was a problem found?

—

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

6E1–383

RODEO Y22SE 2.2L ENGINE DRIVEABILITY AND EMISSION

DIESELING, RUN–ON SYMPTOM

DEFINITION:
Engine continues to run after key is turned OFF, but runs
very rough. If engine runs smoothly, check the ignition
switch and adjustment.

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. Check for a short between B+ and the ignition feed

circuit.

Was a problem found?

—

Verify repair

Go to Step 5 

5

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 connections within a suspected circuit
and/or system

Was a problem found?

—

Verify repair

Contact

Technical

Assistance