P0129

P0129 - Barometric Pressure Out-of-Range Low






For wiring diagrams, refer to.

• When Monitored: With engine speed within 64 RPM of target idle, MAP sensor voltage between 0.04 volts and 4.96 volts, no vehicle speed, and the throttle closed.

• Set Condition: Each time the 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. Refer to => Non-DTC Based Diagnostics. Pre-Diagnostic Troubleshooting Procedure

Test Step 1 - Checking the Map Sensor Operation

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

• Perform the diagnostic procedure for Checking the Map Sensor Operation. Refer to => Non-DTC Based Diagnostics. Testing and Inspection

Were any problems found?

Yes

• Repair as necessary.

• Perform the PCM Verification Test. Refer to => Non-DTC
Based Diagnostics . PCM Verification Test

No

• Refer to the checking for an intermittent DTC diagnostic procedure. Refer to => Non-DTC Based Diagnostics .