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.