Dodge Neon / Neon SRT-4. Manual — part 554
TEST
ACTION
APPLICABILITY
7
NOTE: Before continuing, check the PCM harness connector terminals for
corrosion, damage, or terminal push out. Repair as necessary.
If there are no possible causes remaining, view repair.
All
Repair
Replace and program the Powertrain Control Module in accor-
dance with the Service Information.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
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P0243-WASTEGATE SOLENOID CIRCUIT —
Continued
Symptom List:
P0300-MULTIPLE CYLINDER MISFIRE
P0301-CYLINDER #1 MISFIRE
P0302-CYLINDER #2 MISFIRE
P0303-CYLINDER #3 MISFIRE
P0304-CYLINDER #4 MISFIRE
Test Note:
All symptoms listed above are diagnosed using the same tests.
The title for the tests will be P0300-MULTIPLE CYLINDER
MISFIRE.
When Monitored and Set Condition:
P0300-MULTIPLE CYLINDER MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.0% misfire rate is measured during two trips.
P0301-CYLINDER #1 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.0% misfire rate is measured during two trips.
P0302-CYLINDER #2 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.0% misfire rate is measured during two trips.
P0303-CYLINDER #3 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.0% misfire rate is measured during two trips.
P0304-CYLINDER #4 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.0% misfire rate is measured during two trips.
POSSIBLE CAUSES
INTERMITTENT MISFIRE
VISUAL AND PHYSICAL INSPECTION
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POSSIBLE CAUSES
IGNITION WIRE
ASD RELAY OUPUT CIRCUIT (COIL)
ENGINE MECHANICAL PROBLEM
IGNITION COIL
COIL CONTROL CIRCUIT
SPARK PLUG
CHECKING FUEL PRESSURE
FUEL PUMP INLET STRAINER PLUGGED
RESTRICTED FUEL SUPPLY LINE
FUEL PUMP MODULE
CHECKING FUEL LEAK DOWN
FUEL INJECTOR OPERATION
ASD RELAY OUTPUT CIRCUIT (INJECTOR)
FUEL INJECTOR
INJECTOR CONTROL CIRCUIT
PCM (IGNITION SYSTEM)
PCM
TEST
ACTION
APPLICABILITY
1
Read and record the FREEZE FRAME DATA. Select OBD II MONITORS. Read and
record the MIS-FIRE SIMILAR CONDITIONS WINDOW DATA.
With these screens, attempt to duplicate the condition(s) that has set this DTC.
When the vehicle is operating in the SIMILAR CONDITIONS WINDOW, refer to the
WHICH CYLINDER IS MISFIRING screen.
Observe the WHICH CYLINDER IS MISFIRING screen for at least one minute.
Is there a misfire present?
All
Yes
→ Go To 2
No
→ Go To 18
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P0300-MULTIPLE CYLINDER MISFIRE —
Continued
TEST
ACTION
APPLICABILITY
2
NOTE: Reviewing the vehicle repair history may aid in the repair of the
misfire condition.
Visually and physically inspect the engine for any of the following conditions.
- Worn serpentine belt
- Binding Engine-Driven accessories.
- Misaligned water pump, P/S pump and A/C compressor pulleys
- Improper CKP sensor mounting
- Poor connector/terminal to component connection. i.e., CKP sensor, Fuel Injector,
Ign coil, etc.
- Vacuum leaks
- Restricted Air Induction system
NOTE: Verify the integrity of the powers and grounds for the PCM.
Were any of the above conditions present?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 3
3
Turn the ignition off.
Disconnect the Ignition wire from the spark plug.
NOTE: Before continuing, inspect the ignition wire for damage or carbon
tracking. Replace as necessary.
Install a spark tester to the ignition wire.
While cranking the engine, observe the spark coming from the spark tester.
NOTE: A crisp blue spark should be generated that is able to jump the gap
of the spark tester.
Is good spark present?
All
Yes
→ Go To 4
No
→ Go To 14
4
Turn the ignition off.
Remove the Spark Plug.
Inspect the Spark Plug for the following conditions.
- Cracks
- Carbon Tracking
- Foreign Material
- Gap size out of specifications
- Loose or broke electrode
NOTE: Lightly tap the bottom of the spark plug on a solid surface. The
electrode in the spark plug should not move.
Were any of the above condition present?
All
Yes
→ Replace the Spark Plug.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 5
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P0300-MULTIPLE CYLINDER MISFIRE —
Continued
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