P0129-BAROMETRIC PRESSURE OUT-OF-RANGE LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With engine speed within 64 RPM of target idle, MAP sensor voltage between .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.
| Possible Causes |
| INTERMITTENT DTC |
| MAP SENSOR WIRING OR CONNECTORS |
| (F856) 5 VOLT SUPPLY CIRCUIT HIGH RESISTANCE |
| (K1) MAP SIGNAL CIRCUIT HIGH RESISTANCE |
| (K900) SENSOR GROUND CIRCUIT HIGH RESISTANCE |
| MAP SENSOR |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
Diagnostic Test
1. CHECKING THE MAP SENSOR OPERATIONNOTE: Diagnose and repair any MAP sensor circuit DTCs before continuing with this test.
Perform the diagnostic procedure for *CHECKING THE MAP SENSOR OPERATION.
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM Verification Test Ver. 1 (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)