P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input

Description and meaning of DTC p0107

This diagnostic trouble code (DTC) is a generic powertrain code, which means that it applies to OBD-II equipped vehicles. Although generic, the specific repair steps may vary depending on make/model. The Manifold Absolute Pressure (MAP) sensorresponds to changes in the intake manifold pressure (vacuum). 5 Volts is suppliedto the sensor from the PCM (powertrain control module). Inside the MAPsensor is a resistor that moves in relation to manifold pressure. The resistorvaries the voltage between about 1 volt to 4. 5 volts (depending on engine load)and that voltage signal is returned to the PCM to indicate manifold pressure(vacuum). This signal is essential for the PCM to determine fuel delivery. AP0107 DTC is set when the PCM sees that the MAP signal voltage is less than. 25 volts which is too low.

p0107 diagnostic trouble code symptoms

Anytime the MAP sensor signal is low thevehicle will likely have a very difficult time starting. Other symptoms mayinclude: Hard to start Long cranking times Sputtering/missing Blowing black smoke Poor fuel economy Dies intermittently MIL(Malfunction Indicator Lamp) illumination

DTC p0107 - possible causes

The causes of a low MAP sensor signal circuit (P0107)could be any of the following: 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

How to fix OBD-II diagnostic trouble code p0107

First, using a scan tool with the Key on and engine running, monitor the MAPsensor voltage. If it is reading less than . 5 volts, turn engine off, unplugthe MAP sensor and, using a DVOM (Digital Volt/Ohm Meter) check for 5Volts onthe 5 Volt reference circuit. 1. If there is not 5 Volts on the reference circuit, then check for the referencevoltage at the PCM connector. If it is present at the PCM connector but notthe MAP connector, repair the open in the reference circuit between the PCMand MAP harness connector. If 5 Volt reference is NOT present at the PCM connector,check powers and grounds of PCM and repair/replace as needed. (NOTE: On Chryslerproducts, a shorted Crank sensor, Vehicle speed sensor or any other sensor thatutilizes the 5 Volt reference from the PCM can short out the 5 Volt reference. To fix simply unplug each sensor one at a time until the 5 Volt reference reappears. The last sensor unplugged is the shorted sensor. )2. If you have a 5 Volt reference at the MAP connector, jumper the 5 volt referencecircuit to the signal circuit. Now check the MAP voltage on the scan tool. Itshould be 4. 5 to 5 Volts. If it is, replace MAP sensor. If not, repair open/shortin the signal circuit wiring and re-check. 3. If all appears okay, perform a wiggle test. Start engine and manipulatethe harness, connector and tap on the MAP sensor. Note any changes in voltageor engine speed. Repair connector, harness, or sensor as needed. 4. If the wiggle test checks out, use a vacuum pump (or just use your lungs)to draw a vacuum on the MAP sensor vacuum port. As you add vacuum the voltageshould decrease. With no vacuum, the MAP sensor should read approximately 4. 5volts. If there is no change in MAP sensor reading on the scan tool, replaceMAP sensor. MAP Sensor DTC's: P0105, P0106, P0108 and P0109.

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