AC: Barometric Pressure (BARO) Sensor
Introduction
Introduction
1997 PCED OBDII-Diesel | SECTION 5C: Pinpoint Tests |
AC: Barometric Pressure (BARO) Sensor Introduction | AC: Pinpoint Tests |
The barometric pressure (BARO) sensor is a variable capacitance sensor that, when supplied with a 5-volt reference signal from the powertrain control module (PCM), produces a linear analog voltage signal that indicates pressure.
Timing Control — The BARO signal is used to determine altitude to adjust timing and fuel quantity to optimize engine operation and control smoke throughout all altitude conditions.
Glow Plug Control — The BARO signal is one of the variables used to calculate glow plug ON time. At higher altitudes glow plug on time is increased to insure faster clean up of start-up smoke.
A BARO signal that is detected out of range high or low by the PCM will cause the PCM to ignore the BARO signal and use the manifold absolute pressure (MAP) signal generated at low idle as an indication of barometric pressure.
After removing connectors, always check for damaged pins, corrosion, loose terminals etc.
Circuit Faults:
P0107 = BARO sensor circuit low input
P0108 = BARO sensor circuit high input
| AC: Pinpoint Tests |