Chrysler 300M 2002 Service Manual page 2516

Symptom:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW
When Monitored and Set Condition:
P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW
When Monitored: With the ignition key on. No Cam or Crank signal within 75 ms. Engine
speed at less than 250 RPM.
Set Condition: The PCM senses the voltage from the MAP sensor to be less than 2.196
volts but above 0.0392 of a volt for 300 milliseconds.One Trip Fault.
IAC SENSE CIRCUIT LOW
IAC SENSE CIRCUIT HIGH
INTERMITTENT CONDITION
5 VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
5 VOLT SUPPLY CIRCUIT OPEN
MAP SENSOR INTERNAL FAILURE
MAP SENSOR SIGNAL CIRCUIT OPEN
MAP SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
PCM 5 VOLT SUPPLY CIRCUIT
PCM MAP SENSOR SIGNAL
TEST
1 Ignition on, engine not running.
With the DRBIII , read the MAP Sensor voltage.
Is the voltage below 2.2 volts.
Yes → Go To 2
→ Go To 11
No
2 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Ignition on, engine not running.
Measure the voltage of the 5 Volt Supply circuit in the MAP Sensor harness
connector.
Is the voltage between 4.5 to 5.2 volts?
Yes → Go To 3
→ Go To 7
No
POSSIBLE CAUSES
ACTION
87
DRIVEABILITY - NGC
APPLICABILITY
All
All