2002 ISUZU AXIOM Service Repair Manual

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Page 1225 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±258
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0300 ± Engine Misfire Detected
StepNo Ye s Value(s) Action
81. Install a spark tester at the spark plug end of the
ignition coil for

6E±258
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0300 ± Engine Misfire Detected
StepNo Ye s Value(s) Action
81. Install a spark tester at the spark plug end of the
ignition coil for a cylinder that indicated a misfire.
2. Crank the engine while observing the spark tester.
A crisp, blue spark should be observed.
Is adequate spark present?
ÐGo to Step 14Go to Step 9
91. Remove and visually/physically inspect the ignition
coil(s) associated with the cylinders that were
indicated as misfiring. Ensure that the coil(s) are
free of cracks.
2. If a problem is found, replace the damaged ignition
coil(s) as necessary.
Did any ignition coils require replacement?
ÐVerify repairGo to Step 10
101. Remove the spark plugs from the cylinders that
were indicated as misfiring.
2. Visually inspect the spark plug electrodes.
Does your inspection reveal any spark plugs exhibiting
excessive fouling?
Ð
Go to Engine
Mechanical
Diagnosis
Go to Step 11
111. Visually inspect the spark plug insulators for cracks,
carbon tracking, or other damage.
2. If a problem is found, replace the faulty spark
plug(s) as necessary.
Did your inspection reveal a problem?
ÐVerify repairGo to Step 12
121. Disconnect the MAF sensor electrical connector.
2. Operate the vehicle in ªclosed loopº while
monitoring the ªBANK 1 L.T. FUEL TRIMº and
ªBANK 1 S.T. FUEL TRIMº display on the Tech 2.
Do both values decrease below the specified values?ºBANK 1 L.T.
FUEL TRIMº
below +20%;
ªBANK 1 S.T.
FUEL TRIMº
below +50%
Go to Step 13
Replace the
ignition coil of
the affected
cylinder
13Replace the ignition coil control module.
Is the action complete?
ÐVerify repairÐ
141. Visually and physically inspect the PCM injector
grounds, power grounds and sensor grounds to
ensure that they are clean, tight and in their proper
locations.
2. If a problem is found, correct the faulty ground
condition as necessary.
Did your inspection reveal a poor ground?
ÐVerify repair Go to Step 15
151. Perform the ªFuel System Pressure Testº
procedure.
2. If a problem is found, repair as necessary (refer to
Engine Fuel or Fuel Metering System).
Was a fuel system problem found?
ÐVerify repairGo to Step 16
161. Check the fuel for excessive water, alcohol, or other
contaminants (refer to
Diagnosis in Engine Fuel for
procedure).
2. If a problem is found, correct the contaminated fuel
condition as necessary.
Was the fuel contaminated?
ÐVerify repairGo to Step 17

Page 1226 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±259
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0300 ± Engine Misfire Detected
StepNo Ye s Value(s) Action
171. Perform the ªInjector Coil/Balance Testº.
2. If a problem is found

Page 1227 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±260
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0301 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ)

6E±260
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0301 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ) signals generated from the ignition current
sense system. Combustion signals represent the degree
of combustion in each cylinder. Misfire is detected when
the combustion signal is below a predetermined value.
This DTC P0301 will determine if the No.1 cylinder misfire
is occurring by monitoring the Combustion Quality.
Conditions for Setting the DTC
None of the following DTCs occur: TP sensor, MAF
sensor, vehicle speed sensor, ECT sensor.
The engine speed is between 600 and 6250 RPM.
The system voltage is between 11 and 16 volts.
The ECT indicates an engine temperature between
±7C (28F) and 110C (230F).
The throttle angle is steady and throttle change less
than 2% per 125 milliseconds.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected the fault.
If the misfire is severe enough to cause possible
catalyst damage, the PCM will flash the MIL for as long
as the misfire remains at catalyst damaging levels.
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL ªOFFº on the third
consecutive ignition cycle in which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P0301 will clear after 40 consecutive
ignition cycles occur without a fault.
DTC P0301 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
System grounds ± Ensure all connections are clean
and properly tightened.
Injector ± Perform the injector coil/balance test to
locate a faulty injector that contributes to a lean
condition on the affected cylinder. In addition to the
above test, check the condition of the injector O-ring.
Faulty spark plug ± Check for a cracked insulator,
carbon tracking, incorrect gap, and worn electrodes.
Damaged or faulty ignition coil ± Check for cracks or
other damage.
Substitute a known good coil ± Swap the ignition coils
and retest. If the misfire follows the coil, replace the
ignition coil.
DTC P0301 ± Cylinder Misfire Detected
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Start the engine. Run the engine at idle.
2. Review and record Tech 2 Freeze Frame data.
3. Monitor ªMisfire Cur. #1º on the Tech 2.
Is ªMisfire Cur. #1º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4Go to Step 3
3Monitor ªMisfire Hist. #1º while operating the vehicle to
duplicate the conditions present when the DTC was set
(as defined by the Freeze Frame data recorded in Step
2).
Is ªMisfire Hist. #1º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4
Refer to
Diagnostic
Aids
41. Visually and physically inspect the vacuum hoses
for splits, kinks, and improper connections. Also,
inspect the intake manifold for a vacuum leak.
2. If a problem is found, repair it as necessary.
Did the inspection reveal a problem?
ÐVerify repairGo to Step 5
51. Install a spark tester at the spark plug end of the
cylinder #1 ignition coil.
2. Crank the engine while observing the spark tester.
A crisp, blue spark should be observed.
Is adequate spark present?
ÐGo to Step 8Go to Step 6

Page 1228 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±261
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0301 ± Cylinder Misfire Detected
StepNo Ye s Value(s) Action
61. Remove and visually/physically inspect the ignition
coil associated

Page 1229 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±262
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0302 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ)

6E±262
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0302 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ) signals generated from the ignition current
sense system. Combustion signals represent the degree
of combustion in each cylinder. Misfire is detected when
the combustion signal is below a predetermined value.
This DTC P0302 will determine if the No.2 cylinder misfire
is occurring by monitoring the Combustion Quality.
Conditions for Setting the DTC
None of the following DTCs occur: TP sensor, MAF
sensor, vehicle speed sensor, ECT sensor.
The engine speed is between 600 and 6250 RPM.
The system voltage is between 11 and 16 volts.
The ECT indicates an engine temperature between
±7C (28F) and 110C (230F).
The throttle angle is steady and throttle change less
than 2% per 125 milliseconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
If the misfire is severe enough to cause possible
catalyst damage, the PCM will flash the MIL for as long
as the misfire remains at catalyst damaging levels.
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL ªOFFº on the third
consecutive ignition cycle in which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P0302 will clear after 40 consecutive
ignition cycles occur without a fault.
DTC P0302 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
System grounds ± Ensure all connections are clean
and properly tightened.
Injector ± Perform the injector coil/balance test to
locate a faulty injector that contributes to a lean
condition on the affected cylinder. In addition to the
above test, check the condition of the injector O-ring.
Faulty spark plug ± Check for a cracked insulator,
carbon tracking, incorrect gap, and worn electrodes.
Damaged or faulty ignition coil ± Check for cracks,
carbon tracking or other damage.
Substitute a known good coil ± Swap the ignition coils
and retest. If the misfire follows the coil, replace the
ignition coil.
DTC P0302 ± Cylinder Misfire Detected
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Start the engine. Run the engine at idle.
2. Review and record Tech 2 Freeze Frame data.
3. Monitor ªMisfire Cur. #2º on the Tech 2.
Is ªMisfire Cur. #2º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4Go to Step 3
3Monitor ªMisfire Hist. #2º while operating the vehicle to
duplicate the conditions present when the DTC was set
(as defined by the Freeze Frame data recorded in Step
2).
Is ªMisfire Hist. #2º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4
Refer to
Diagnostic
Aids
41. Visually and physically inspect the vacuum hoses
for splits, kinks, and improper connections. Also,
inspect the intake manifold for a vacuum leak.
2. If a problem is found, repair it as necessary.
Did the inspection reveal a problem?
ÐVerify repairGo to Step 5
51. Install a spark tester at the spark plug end of the
cylinder #2 ignition coil.
2. Crank the engine while observing the spark tester.
A crisp, blue spark should be observed.
Is adequate spark present?
ÐGo to Step 8Go to Step 6

Page 1230 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±263
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0302 ± Cylinder Misfire Detected
StepNo Ye s Value(s) Action
61. Remove and visually/physically inspect the ignition
coil associated

Page 1231 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±264
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0303 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ)

6E±264
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P0303 Cylinder Misfire Detected
Circuit Description
Misfire is monitored as a function of the combustion
quality (CQ) signals generated from the ignition current
sense system. Combustion signals represent the degree
of combustion in each cylinder. Misfire is detected when
the combustion signal is below a predetermined value.
This DTC P0303 will determine if the No.3 cylinder misfire
is occurring by monitoring the Combustion Quality.
Conditions for Setting the DTC
None of the following DTCs occur: TP sensor, MAF
sensor, vehicle speed sensor, ECT sensor.
The engine speed is between 600 and 6250 RPM.
The system voltage is between 11 and 16 volts.
The ECT indicates an engine temperature between
±7C (28F) and 110C (230F).
The throttle angle is steady and throttle change less
than 2% per 125 milliseconds.
Action Taken When the DTC Sets
The PCM will ON the MIL after second trip with
detected the fault.
If the misfire is severe enough to cause possible
catalyst damage, the PCM will flash the MIL for as long
as the misfire remains at catalyst damaging levels.
The PCM will store conditions which were present
when the DTC was set as Freeze Frame and in the
Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn the MIL ªOFFº on the third
consecutive ignition cycle in which the diagnostic has
been run and the fault condition is no longer present.
A history DTC P0303 will clear after 40 consecutive
ignition cycles occur without a fault.
DTC P0303 can be cleared by using the Tech 2 ªClear
Infoº function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
System grounds ± Ensure all connections are clean
and properly tightened.
Injector Ð Perform the injector coil/balance test to
locate a faulty injector that contributes to a lean
condition on the affected cylinder. In addition to the
above test, check the condition of the injector O-ring.
Faulty spark plug ± Check for a cracked insulator,
carbon tracking, incorrect gap, and worn electrodes.
Damaged or faulty ignition coil ± Check for cracks,
carbon tracking or other damage.
Substitute a known good coil ± Swap the ignition coils
and retest. If the misfire follows the coil, replace the
ignition coil.
DTC P0303 ± Cylinder Misfire Detected
StepActionValue(s)Ye sNo
1Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Start the engine. Run the engine at idle.
2. Review and record Tech 2 Freeze Frame data.
3. Monitor ªMisfire Cur. #3º on the Tech 2.
Is ªMisfire Cur. #3º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4Go to Step 3
3Monitor ªMisfire Hist. #3º while operating the vehicle to
duplicate the conditions present when the DTC was set
(as defined by the Freeze Frame data recorded in Step
2).
Is ªMisfire Hist. #3º increasing (indicating a misfire
currently occurring)?
ÐGo to Step 4
Refer to
Diagnostic
Aids
41. Visually and physically inspect the vacuum hoses
for splits, kinks, and improper connections. Also,
inspect the intake manifold for a vacuum leak.
2. If a problem is found, repair it as necessary.
Did the inspection reveal a problem?
ÐVerify repairGo to Step 5
51. Install a spark tester at the spark plug end of the
cylinder #3 ignition coil.
2. Crank the engine while observing the spark tester.
A crisp, blue spark should be observed.
Is adequate spark present?
ÐGo to Step 8Go to Step 6

Page 1232 of 2100

ISUZU AXIOM 2002 Service Repair Manual 6E±265
6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0303 ± Cylinder Misfire Detected
StepNo Ye s Value(s) Action
61. Remove and visually/physically inspect the ignition
coil associated

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