Chrysler Sebring 2004 Service Manual page 2256

P0300-MULTIPLE CYLINDER MISFIRE —
TEST
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?
Yes → Go To 2
→ Go To 18
No
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?
Yes → Repair as necessary.
→ Go To 3
No
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?
Yes → Go To 4
→ Go To 14
No
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?
Yes → Replace the Spark Plug.
→ Go To 5
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
Perform POWERTRAIN VERIFICATION TEST VER - 5 - NGC.
DRIVEABILITY - NGC
Continued
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APPLICABILITY
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