Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1517
6E2–519
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Backfire Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Fuel ignites in the intake manifold, or in the exhaust
system, making a loud popping noise.
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 proper ignition voltage coil output with
spark tester J 26792 (ST-125). Refer to
Electric
Ignition System for procedure.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 5
5
1. Remove spark plugs and check for wet plugs,
cracks, wear, improper gap, burned electrodes, or
heavy deposits. Refer to
Electronic Ignition
System.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs. Refer to
DTC P0172 to determine the
cause of a rich condition or
Engine Mechanical for an oil
fouling condition.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 6
6
1. Visually/physically inspect the ignition coils for
cracks.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 7
7
1. Check for an intermittent ignition system
malfunction:
D
Intermittent CKP 58X signal.
D
Intermittent ignition feed circuit or sensor
ground circuit to the crankshaft position
sensor.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 8
8
1. Check the fuel pressure. Refer to
Fuel System
Pressure Test.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 9
6E2–520
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Backfire Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
9
1. Check for the following engine mechanical
conditions.
Refer to
Engine Mechanical for diagnosis
procedures:
D
Low compression
D
Sticking or leaking valves
D
Worn camshaft lobe(s)
D
Camshaft drive belt slipped or stripped
D
Incorrect valve timing
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 10
10
1. Check the intake and exhaust manifold(s) for
casting flash. Refer to
Engine Mechanical.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 11
11
1. Review all 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 butter
D
All electrical connections within a suspected
circuit and/or system.
3. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Contact
Technical
Assistance
6E2–521
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Cuts Out, Misses Symptom
Step
Action
Value(s)
Yes
No
1
DEFINITION:
Steady pulsation or jerking that follows engine speed;
usually more pronounced as engine load increases.
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 14
Go to
Step 3
3
Was a visual/physical check performed?
—
Go to
Step 4
Go to
Visual/
Physical
Check
4
Was the “Electric Throttle Control (ETC) System
Check” performed?
—
Go to
Step 5
Go to
ETC
System
Check
5
1. Check the PCM grounds for clearness, tightness
and proper routing. Refer to the PCM wiring
diagrams in
Electrical Diagnosis.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 6
6
Observe the long term fuel trim on the Tech 2.
Is the long term fuel trim significantly in the negative
range (rich condition)?
—
Go to
Step 7
Go to
Step 8
7
1. Check items that can cause the engine to run rich.
Refer to
Diagnostic Aids in DTC P0172 Diagnostic
Support.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 10
8
Is the long term fuel trim significantly in the positive
range (lean condition)?
—
Go to
Step 9
Go to
Step 10
9
1. Check items that can cause the engine to run lean.
Refer to
Diagnostic Aids in DTC P0171 Diagnostic
Support.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 10
10
1. Check for incorrect idle speed. Ensure that the
following conditions are present:
D
The engine is fully warm.
D
The accessories are “off”.
2. Using a Tech 2, monitor the Engine Speed.
Is the Engine Speed within the specified values?
Desired Idle
Speed
Go to
Step 12
Go to
Step 11
6E2–522
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
Cuts Out, Misses Symptom
(Cont'd)
Step
No
Yes
Value(s)
Action
11
1. Visually/physically inspect for the following
conditions:
D
Restricted air intake system. Check for a
possible collapsed air intake duct, restricted
air filter element, or foreign objects blocking
the air intake system.
D
Large vacuum leak. Check for a condition that
causes a large vacuum leak, such as an
incorrectly installed or faulty PCV valve or
brake booster hose disconnected .
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 9
12
Check the injector connections. If any of the injectors
are connected to an incorrect cylinder, correct as
necessary.
Was a problem found?
—
Verify repair
Go to
Step 13
13
1. Perform the “Injector Coil/Balance Test” in
Fuel
Metering System.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 14
14
1. Check for fuel in the pressure regulator vacuum
hose.
2. If fuel is present, replace the fuel pressure regulator
assembly. Refer to
Fuel Metering System.
3. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 15
15
1. Check for proper ignition voltage output with spark
tester J 26792 (ST-125). Refer to
Electronic Ignition
System for the procedure.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 16
16
1. Remove spark plugs. Check for wet plugs, cracks,
wear, improper gap, burned electrodes, or heavy
deposits. Refer to
Electronic Ignition System.
NOTE: If spark plugs are gas or oil fouled, the cause of
the fouling must be determined before replacing the
spark plugs.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 17
17
1. Check for a loose ignition coil ground and ION
Sensing module circuit.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 18
18
1. Check ignition coils for cracks or carbon tracking.
2. If a problem is found, repair as necessary.
Was a problem found?
—
Verify repair
Go to
Step 19
19
Using a Tech 2, monitor the TP 1, 2 angle with the
engine idling.
Is the TP angle at the specified value and steady?
8
∼
10%
Go to
Step 20
Refer to
DTC
P0123 for
further
diagnosis
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