Chrysler 300M 2002 Service Manual page 2548

P0300-MULTIPLE CYLINDER MISFIRE —
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 r
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.
INTERMITTENT MISFIRE
SECONDARY IGNITION
ENGINE MECHANICAL PROBLEM
FUEL SYSTEM PROBLEM
ERRATIC CAM/CRANK SENSOR SIGNALS
OTHER POSSIBLE CAUSES FOR MIS-FIRE
PCM
TEST
1 With the DRBIII , select DTCs and RELATED FUNCTIONS. 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 the DRBIII counting mis-fires at this time?
Yes → Go To 2
→ Go To 8
No
2 With the DRBIII , read the FREEZE FRAME DATA.
Use the FREEZE FRAME DATA and attempt to determine the cause of the Misfire
DTC.
In the FREEZE FRAME DATA, is the LOAD VALUE over 50% and the operating
temp normal?
Yes → Check secondary ignition components and perform a cylinder
→ Go To 3
No
POSSIBLE CAUSES
ACTION
leakage test.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
Continued
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APPLICABILITY
All
All