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Diagnostic Trouble Code (DTC) P0107

Manifold Absolute Pressure Sensor Low Voltage


What is the circuit like?


  •  In unison with the Manifold Absolute Pressure (MAP) sensor, the engine control module (ECM) regulates the flow of fuel and the ignition timing.
  •  The MAP sensor which is metric pressure enables the ECM to make necessary adjustments for differing altitudes.
  • The output voltage of the MAP sensor changes with the change in the manifold pressure.
  • The intake manifold pressure created due to engine load (intake manifold vacuum) and the rpm changes is measured by the MAP sensor and transformed into voltage outputs.
  • The ECM notes the manifold pressure by keeping a vigil on the MAP sensor output voltage.
  • The MAP sensor directly receives a 5 volt-reference voltage sent to it by the ECM.
  • At idle, about 1.0 to 1.5 volts indicates a low-pressure (low voltage) output voltage.
  • At wide open throttle (WOT) about 4.5 to 4.8 volts indicates higher pressure (high voltage) output voltage.



                           QUESTION- WHEN DOES THE DTC SET?

                           ANSWER- This DTC can be stored in "key-on" status.

            Here are the two tabulated cases when the DTC sets:

CASE      A

CASE      B

1)  The engine is idling.

1) When the engine part is in load.

2)  No throttle position (TP) sensor MTIA fail conditions are present.

2) The engine revolution speed is < 4,000rpm

3)  Engine speed (rpm) is < 2,500rpm.

3) No Throttle Position (TP) Sensor fails conditions are present.

4)  The MAP is < 12.0 kPa.

4) The Throttle Position (TP) angle is > 30.0.



5) The MAP is < 11.5 kPa.


6) An open or low voltage condition exists.





1) The Malfunction Indicator Lamp (MIL) is seen glowing.

1) The MIL will turn off automatically after four repetitive ignition cycles in which the diagnostic runs flawlessly.


2) The ECM is enabled to record operating conditions when the diagnostic fails and this information will be stored in the Freeze Frame and Failure Records will buffer.


2) A history DTC will unset after 40 consecutive warm-up cycles.

3) A history DTC is stored

3)The Scan Tool will clear all DTCs.


4) The ECM substitutes a fixed MAP value

4) Disconnecting the ECM battery feed for more than 10 seconds

5) The ECM uses TP to control the fuel delivery (the scan tool will not show anything now)




Diagnostic Assistance


  • The manifold pressure =atmospheric pressure when the ignition is ON and the engine is also switched OFF.
  • Under this circumstance the signal voltage will remain high.
  • The ECM makes use of this information as a reminder of vehicle altitude.
  • The reading obtained here can be cross checked with the reading of another car having the same sensor in common to verify and note the exactness of the suspected sensor.
  • Readings must be 0.4volt.
  • In case of an intermittent in DTC P0107, "Manifold Absolute Pressure Check" in this section should be consulted for better diagnosis.
  • The manifold absolute pressure (MAP) sensor signal voltage while moving related connectors and the wiring harness should be inspected if the connections seem to function correctly.
  •  The reading on the scan tool will automatically change if there is an induced failure.
  • This helps to separate the location of an intermittent malfunction.

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