What does P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input mean?
The P0107 code, also known as the Manifold Absolute Pressure/Barometric Pressure Circuit Low Input, is a generic powertrain code that applies to OBD-II equipped vehicles.
The Manifold Absolute Pressure (MAP) sensor is responsible for detecting changes in the intake manifold pressure or vacuum.
The sensor receives 5 Volts from the PCM and has a resistor that moves in relation to manifold pressure.
This resistor varies the voltage signal returned to the PCM to indicate manifold pressure, which is crucial for the correct fuel delivery.
The P0107 code is set when the PCM detects that the MAP signal voltage is too low, indicating a potential issue with the sensor or the circuit.
Some symptoms of this code may include difficulty starting the vehicle, long cranking times, sputtering or missing, poor fuel economy, and intermittent engine stalls.
There are various possible causes for this code, including a faulty MAP sensor, an open or short in the signal or reference circuit, a ground circuit issue, or a bad PCM.
To diagnose and resolve the issue, an experienced mechanic would typically use a scan tool to monitor the MAP sensor voltage, check for the presence of the 5 Volt reference circuit, perform a wiggle test, and use a vacuum pump to test the MAP sensor's response.
P0107 Symptoms
- Hard to start
- Long cranking times
- Sputtering/missing
- Blowing black smoke
- Poor fuel economy
- Dies intermittently
- MIL (Malfunction Indicator Lamp) illumination
Possible P0107 Causes
- Bad MAP sensor
- Open or short in the signal circuit
- Open or short in the 5 Volt reference circuit
- Ground circuit open or shorted
- Bad PCM
Troubleshooting P0107 error code
- Monitor the MAP sensor voltage with a scan tool
- Check for 5 Volts on the 5 Volt reference circuit
- Repair any open in the reference circuit
- Check powers and grounds of PCM and repair/replace as needed
- Jumper the 5 volt reference circuit to the signal circuit and check the MAP voltage
- Replace MAP sensor
- Perform a wiggle test and repair connector, harness, or sensor as needed
- Use a vacuum pump to draw a vacuum on the MAP sensor vacuum port and check for a change in voltage
- Replace MAP sensor if there is no change in voltage
