Isuzu Rodeo UE. Manual — part 249
6E1–367
RODEO X22SE 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:
f
Damaged or collapsed pipes.
f
Internal muffler failure.
f
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:
f
Visual/physical inspection
f
Tech 2 data
f
Freeze Frame data/Failure Records buffer
f
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
6E1–368
RODEO X22SE 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
6E1–369
RODEO X22SE 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.
f
Low compression
f
Leaking cylinder head gasket
f
Worn or incorrect camshaft
f
Sticking or leaking valves
f
Valve timing
f
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:
f
Visual/physical inspection
f
Tech 2 data
f
Freeze Frame data/Failure Records buffer
f
All electrical connections within a suspected
circuit and/or system
Was a problem found?
—
Verify repair
Contact
Technical
Assistance
6E1–370
RODEO X22SE 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:
f
Visual/physical inspection
f
Tech 2 data
f
Freeze Frame data/Failure Records buffer
f
All connections within a suspected circuit
and/or system
Was a problem found?
—
Verify repair
Contact
Technical
Assistance
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