Chrysler Sebring, Stratus sedan, Sebring Convertible. Manual — part 185
P0305-CYLINDER #5 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.8% misfire rate is measured during two trips, or with
a 10% to 30% misfire rate during one trip.
P0306-CYLINDER #6 MISFIRE
When Monitored:
Any time the engine is running, and the Target Learning Coefficient
has been successfully updated.
Set Condition:
When more than a 1.8% misfire rate is measured during two trips, or with
a 10% to 30% misfire rate during one trip.
POSSIBLE CAUSES
INTERMITTENT MISFIRE
VISUAL AND PHYSICAL INSPECTION
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
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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
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
NOTE: On the 3.5L engines, it may necessary to remove the upper intake to
access some ignition coils. Once the ignition coil has been removed, the
intake must be reinstall to be able to crank the engine.
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
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TEST
ACTION
APPLICABILITY
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
5
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
Install a fuel pressure gauge.
Start the engine and observe the fuel pressure reading.
NOTE: Fuel pressure specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Choose a conclusion that best matches your fuel pressure reading.
All
Within Specification
Below Specification
Above Specification
Replace the fuel filter/pressure regulator.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
6
NOTE: Before continuing visually and physically inspect the fuel delivery
system for external leaks or damage. Repair /replace as necessary.
Turn the ignition off.
WARNING: The fuel system is under a constant pressure even with the
engine off. Before testing or servicing any fuel system hose, fitting or line,
the fuel system pressure must be released.
Install special 5/16 fuel line adapter tool #6539.
Attach a fuel pressure test gauge to the T fitting on the tool #6539
Start the engine and allow the fuel system to reach maximum pressure.
Turn the ignition off.
NOTE: Fuel specification is 400 KPa +/- 34 KPa (58 psi +/- 5 psi).
Using special tool #C4390, Hose Clamp Pliers, slowly clamp off the rubber hose on
the Fuel Pressure adapter between the fuel pressure gauge and the fuel pump
module.
Monitor the fuel pressure gauge for a minimum of 5 minutes.
NOTE: The pressure should not fall below 241 KPa (35 psi)
Does the fuel pressure gauge fall below the above specification?
All
Yes
→ Replace the leaking Injector(s).
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 7
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TEST
ACTION
APPLICABILITY
7
Warning: The fuel system is under a constant pressure (even with the engine
off). Before testing or servicing any fuel system hose, fitting or line, the fuel
system pressure must be released.
CAUTION: After each actuation of the Fuel Injector, start the engine to clear
the cylinder of fuel. Failure to do so could cause engine damage.
Install a Fuel Pressure Gauge to the fuel rail.
Start the engine and allow the fuel pressure to reach maximum pressure.
Turn the engine off, leaving the ignition on.
Using the DRBIII
t, actuate the Fuel Injector for the cylinder that indicated the
misfire.
Monitor the fuel pressure gauge.
Does the fuel pressure gauge indicate a drop in fuel pressure?
All
Yes
→ Go To 8
No
→ Go To 9
8
Check for any of the following conditions/mechanical problems.
ENGINE VACUUM - must be at least 13 inches in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE PCV SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - no internal vacuum leaks
FUEL - must be free of contamination
Are there any engine mechanical problems?
All
Yes
→ Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 18
9
Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Ignition on, engine not running.
With the DRBIII
t, actuate the ASD Relay.
Using a 12-volt test light connected to ground, probe the ASD Relay Output circuit at
the Fuel Injector harness connector.
Does the test light illuminate brightly?
All
Yes
→ Go To 10
No
→ Repair the ASD Relay Output circuit.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
10
Turn the ignition off.
Disconnect the Fuel Injector harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to 12-volts, probe the Injector Control circuit.
With the DRBIII
t, actuate the Fuel Injector.
Does the test light blink/flicker?
All
Yes
→ Replace the Fuel Injector.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
No
→ Go To 11
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