P0129

P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW





For a complete wiring diagram, refer to the Wiring Information.

- When Monitored:
With engine speed within 64 RPM of target idle, MAP sensor voltage between.04 of a volt and 4.96 volts, no vehicle speed, and the throttle closed.

- Set Condition:
Each time the Powertrain Control Module (PCM) detects that the MAP sensor value is greater than a calibrated value for BARO, a counter is incremented. If the counter reaches a calibrated limit, the test fails. One trip fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
CHECKING THE MAP SENSOR OPERATION

NOTE: Diagnose and repair any MAP sensor circuit DTCs before continuing with this test.

1. Perform the diagnostic procedure for CHECKING THE MAP SENSOR OPERATION. . Checking The MAP Sensor Operation

Were any problems found?

Yes

- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. . Intermittent Condition Test