P0109: BARO Sensor Circuit Intermittent
WARNING: This page does not describe the selected car, but rather 30 other vehicles, including the 2004 Mercury Sable, 2004 Mercury Mountaineer, 2004 Mercury Monterey, 2004 Mercury Marauder, and 2004 Mercury Grand Marquis. However, it is still accessible from the selected car via links, so may be relevant.
P0109 - BARO SENSOR CIRCUIT INTERMITTENT
| Description: | The sensor signal to the PCM is failing intermittently. | ||
| Possible Causes: |
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| Diagnostic Aids: | Check the harness and connection. | ||
| Application | Key On Engine Off | Key On Engine Running | Continuous Memory |
| Vehicles with an EGR System Module (ESM) | GO to PINPOINT TEST DM: MANIFOLD ABSOLUTE PRESSURE (MAP) AND THERMAL MANIFOLD ABSOLUTE PRESSURE (TMAP) SENSOR Step 14. | - | - |
| Vehicles with a MAP or TMAP sensor | GO to PINPOINT TEST DM: MANIFOLD ABSOLUTE PRESSURE (MAP) AND THERMAL MANIFOLD ABSOLUTE PRESSURE (TMAP) SENSOR Step 21. | - | - |
| Vehicles with a Barometric Pressure (BARO) Sensor | GO to PINPOINT TEST DQ: BAROMETRIC PRESSURE (BARO) SENSOR Step 1. | - | - |