Isuzu Rodeo UE. Manual — part 250
6E1–371
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
BACKFIRE SYMPTOM
DEFINITION:
Fuel ignites in the intake manifold, or in the exhaust
system, making a loud popping noise.
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
Check for proper ignition voltage output with spark
tester J 26792.
Was a problem found?
—
Verify repair
Go to Step 5
5
1. Remove the spark plugs and check for gas or oil
fouling, cracks, wear, improper gap, burned
electrodes of heavy deposits.
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 6
6
1. Visually/physically inspect the secondary ignition
wires. Check for the following conditions:
f
Verify that all ignition wire resistances are less
than the specified value.
f
Verify that ignition wires are correctly routed to
eliminate cross–firing.
f
Verify that ignition wires are not arcing to
ground. Spraying the secondary ignition wires
with a light mist of water may help locate an
intermittent problem.
Was a problem found?
—
Verify repair
Go to Step 7
7
Check for an intermittent ignition system malfunction:
f
Intermittent CKP 58X signal.
f
Intermittent ignition feed circuit or sensor ground
circuit to the crankshaft position sensor.
Was a problem found?
—
Verify repair
Go to Step 8
8
To determine if there is a problem with fuel delivery,
refer to Fuel System Diagnosis.
Was a problem found?
—
Verify repair
Go to Step 9
9
1. Check for the following engine mechanical
problems:
f
Low compression
f
Leaking cylinder head gasket
f
Worn or incorrect camshaft
f
Incorrect valve timing
f
Sticking or leaking valves
f
Camshaft drive belt slipped or stripped.
Was a problem found?
—
Verify repair
Go to Step 10
6E1–372
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Step
No
Yes
Value(s)
Action
10
Check the intake and exhaust manifold(s) for casting
flash. Refer to Engine Mechanical.
Was a problem found?
—
Verify repair
Go to Step 11
11
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
6E1–373
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
CUTS OUT, MISSES SYMPTOM
DEFINITION:
Steady pulsation or jerking that follows engine speed;
usually more pronounced as engine load increases.
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
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 5
5
Monitor ”Long Term Fuel Trim” on the Tech 2.
Is the ”Long Term Fuel Trim” in the negative range (rich
condition)?
—
Go to Step 6
Go to Step 7
6
Check items that can cause the engine to run rich.
Refer to ”Diagnostic Aids” in DTC P0172.
Was a problem found?
—
Verify repair
Go to Step 9
7
Is the long term fuel trim significantly in the positive
range (lean condition)?
—
Go to Step 8
Go to Step 9
8
Check items that can cause the engine to run lean.
Refer to Diagnostic Aids in DTC P0171.
Was a problem found?
—
Verify repair
Go to Step 9
9
1. Check for incorrect idle speed. Ensure that the
following conditions are present:
f
Engine fully warm.
f
Accessories are OFF.
2. Using a Tech 2, monitor the IAC position.
Is the IAC position within the specified values?
Between 5
and 50
counts
Go to Step 11
Go to Step 10
10
1. Visually/physically inspect for the following
conditions:
f
Restricted air intake system. Check for a
restricted air filter element, or foreign objects
blocking the air intake system.
f
Check for objects blocking the IAC passage or
throttle bore, excessive deposits in the IAC
passage and on the IAC pintle, and excessive
deposits in the throttle bore and on the throttle
plate.
f
Check for a condition that causes a large
vacuum leak, such as an incorrectly installed
or faulty crankcase ventilation valve or brake
booster hose disconnected.
Was a problem found?
—
Verify repair
Go to Step 11
6E1–374
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Step
No
Yes
Value(s)
Action
11
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 12
12
1. Perform the Injector Coil/Balance Test.
Was a problem found?
—
Verify repair
Go to Step 13
13
1. Check for fuel in the pressure regulator vacuum
hose.
2. If fuel is present, replace the fuel pressure regulator
assembly.
Was a problem found?
—
Verify repair
Go to Step 14
14
Check for proper ignition voltage output with spark
tester J 26792.
Was a problem found?
—
Verify repair
Go to Step 15
15
1. Remove spark plugs and check for gas or oil fouling,
cracks, wear, improper gap, burned electrodes of
heavy deposits.
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 16
16
Check for a loose ignition control module ground.
Was a problem found?
—
Verify repair
Go to Step 17
17
Using a Tech 2, monitor the TP angle with the engine
idling.
Is the TP angle at the specified value and steady?
0%
Go to Step 18
For further
diagnosis,
refer to DTC
P0123
18
Check the PCV valve for proper operation.
Was a problem found?
—
Verify repair
Go to Step 19
19
Check for the following engine mechanical problems:
f
Low compression
f
Leaking cylinder head gasket
f
Worn or incorrect camshaft
f
Incorrect valve timing
f
Sticking or leaking valves
f
Camshaft drive belt slipped or stripped.
Was a problem found?
—
Verify repair
Go to Step 20
20
Check for faulty motor mounts. Refer to Engine
Mechanical for inspection of the mounts.
Was a problem found?
—
Verify repair
Go to Step 21
21
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
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст