Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual — part 1452
6E2–259
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0300 – Engine Misfire Detected
(Cont'd)
Step
No
Yes
Value(s)
Action
17
1. Perform the “Injector Coil/Balance Test”.
2. If a problem is found, replace faulty injector(s) as
necessary.
Did any of the injectors require replacement?
—
Verify repair
Go to
Step 18
18
1. Check for an engine mechanical problem. Refer to
Engine Mechanical Diagnosis to diagnose the
following conditions:
D
A faulty or incorrect camshaft
D
Leaking or sticky valves or rings
D
Excessive valve deposits
D
Weak valve springs
D
Incorrect valve timing
D
A leaking head gasket
D
A loose or broken motor mount
2. If a problem is found, repair as necessary.
Was a basic engine mechanical problem found and
repaired?
—
Verify repair
Go to
Step 19
19
1. Check for a transmission TCC problem. Refer to
4L30-E Automatic Transmission Diagnosis.
2. If a problem is found, repair the transmission as
necessary. Refer to
4L30-E Automatic
Transmission Unit Repair.
Was a transmission problem found and repaired?
—
Verify repair
Go to
Step 20
20
Replace the MAF sensor.
Is the action complete?
—
Verify repair
—
6E2–260
RODEO 6VD1 3.2L 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
D
None of the following DTCs occur: TP sensor, MAF
sensor, vehicle speed sensor, ECT sensor.
D
The engine speed is between 600 and 6250 RPM.
D
The system voltage is between 11 and 16 volts.
D
The ECT indicates an engine temperature between
–7
°
C (28
°
F) and 110
°
C (230
°
F).
D
The throttle angle is steady and throttle change less
than 2% per 125 milliseconds.
Action Taken When the DTC Sets
D
The PCM will ON the MIL after second trip with
detected the fault.
D
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.
D
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
D
The PCM will turn the MIL “OFF” on the third
consecutive ignition cycle in which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P0301 will clear after 40 consecutive
ignition cycles occur without a fault.
D
DTC P0301 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
D
System grounds – Ensure all connections are clean
and properly tightened.
D
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.
D
Faulty spark plug – Check for a cracked insulator,
carbon tracking, incorrect gap, and worn electrodes.
D
Damaged or faulty ignition coil – Check for cracks or
other damage.
D
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
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. Start the engine. Run the engine at idle.
2. Review and record Tech 2 Freeze Frame data.
3. Monitor “Misfire Cur. #1” on the Tech 2.
Is “Misfire Cur. #1” increasing (indicating a misfire
currently occurring)?
—
Go to
Step 4
Go to
Step 3
3
Monitor “Misfire Hist. #1” 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 “Misfire Hist. #1” increasing (indicating a misfire
currently occurring)?
—
Go to
Step 4
Refer to
Diagnostic
Aids
4
1. 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?
—
Verify repair
Go to
Step 5
5
1. 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?
—
Go to
Step 8
Go to
Step 6
6E2–261
RODEO 6VD1 3.2L ENGINE DRIVEABILITY AND EMISSIONS
DTC P0301 – Cylinder Misfire Detected
(Cont'd)
Step
No
Yes
Value(s)
Action
6
1. Remove and visually/physically inspect the ignition
coil associated with cylinder #1. Ensure that the coil
is free of cracks and carbon tracking.
2. If a problem is found, replace the damaged ignition
coil as necessary.
Did the visual inspection reveal a problem?
—
Verify repair
Go to
Step 7
7
1. Measure the ignition coil primary resistance.
2. If resistance is not within the specified value,
replace the faulty ignition coil.
Did the ignition coil require replacement?
2.6-2.7 K
W
Verify repair
Go to
Step 12
8
Remove the cylinder #1 spark plug and visually inspect
the spark plug electrode.
Does the inspection reveal excessive fouling?
—
Go to
Contaminatio
n Diagnosis
chart in
Engine
Mechanical
Diagnosis
Go to
Step 9
9
1. Visually inspect the spark plug insulator for cracks,
carbon tracking, or other damage.
2. If the spark plug is damaged, replace the spark plug.
Did the inspection reveal a problem?
—
Verify repair
Go to
Step 10
10
1. Perform the “Injector Coil/Balance Test”.
2. If any faulty injectors are found, replace them as
necessary.
Did any of the injectors require replacement?
—
Verify repair
Go to
Step 11
11
1. Inspect the injector O-rings for a vacuum leak.
2. If a problem is found, repair it as necessary.
Did the inspection reveal a problem?
—
Verify repair
Go to
Step 12
12
Check for an engine mechanical problem. Refer to
Engine Mechanical Diagnosis to diagnose and repair
the following conditions:
D
A faulty or incorrect camshaft
D
Leaking or sticky valves or rings
D
Excessive valve deposits
D
Weak valve springs
D
A leaking head gasket
Was a basic engine mechanical problem found?
—
Verify repair
Refer to
Diagnostic
Aids
6E2–262
RODEO 6VD1 3.2L 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
D
None of the following DTCs occur: TP sensor, MAF
sensor, vehicle speed sensor, ECT sensor.
D
The engine speed is between 600 and 6250 RPM.
D
The system voltage is between 11 and 16 volts.
D
The ECT indicates an engine temperature between
–7
°
C (28
°
F) and 110
°
C (230
°
F).
D
The throttle angle is steady and throttle change less
than 2% per 125 milliseconds.
Action Taken When the DTC Sets
D
The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
D
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.
D
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
D
The PCM will turn the MIL “OFF” on the third
consecutive ignition cycle in which the diagnostic has
been run and the fault condition is no longer present.
D
A history DTC P0302 will clear after 40 consecutive
ignition cycles occur without a fault.
D
DTC P0302 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
D
System grounds – Ensure all connections are clean
and properly tightened.
D
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.
D
Faulty spark plug – Check for a cracked insulator,
carbon tracking, incorrect gap, and worn electrodes.
D
Damaged or faulty ignition coil – Check for cracks,
carbon tracking or other damage.
D
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
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. Start the engine. Run the engine at idle.
2. Review and record Tech 2 Freeze Frame data.
3. Monitor “Misfire Cur. #2” on the Tech 2.
Is “Misfire Cur. #2” increasing (indicating a misfire
currently occurring)?
—
Go to
Step 4
Go to
Step 3
3
Monitor “Misfire Hist. #2” 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 “Misfire Hist. #2” increasing (indicating a misfire
currently occurring)?
—
Go to
Step 4
Refer to
Diagnostic
Aids
4
1. 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?
—
Verify repair
Go to
Step 5
5
1. 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?
—
Go to
Step 8
Go to
Step 6
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