P0107
DTC P0107 Manifold Absolute Pressure Sensor Low InputWiring Diagram:
Circuit Description
The engine control module (ECM) uses the Manifold Absolute Pressure (MAP) sensor to control the fuel delivery and the ignition timing. The MAP sensor measures the changes in the intake manifold pressure, which results from engine load (intake manifold vacuum) and the rpm changes; and converts these into voltage outputs. The ECM sends a 5 volt-reference voltage to the MAP sensor. As the manifold pressure changes, the output voltage of the MAP sensor also changes. By monitoring the MAP sensor output voltage, the ECM knows the manifold pressure. A low-pressure (low voltage) output voltage will be about 1.1 to 1.5 volts at idle, while higher pressure (high voltage) output voltage will be about 4.5 to 5.0 V at wide open throttle (WOT). The MAP sensor is metric pressure, allowing the ECM to make adjustments for different altitudes.
Conditions for Setting the DTC
- This DTC can be stored in "key-on" status.
(Case A)
- When the engine idling.
- No throttle position (TP) sensor MTIA fail conditions present.
- Engine speed (rpm) is less than 1,500 rpm.
- The MAP sensor voltage is less than 0.142 V.
(Case B)
- When the vehicle is running.
- The engine speed is less than 5,500 rpm.
- No Throttle Position (TP) Sensor fails conditions present.
- The Throttle Position (TP) angle greater than 10.3 °.
- The MAP sensor voltage is less than 0.142 V.
- An open or low voltage condition exists.
Action Taken When the DTC Sets
- The Malfunction Indicator Lamp (MIL) will illuminate.
- The ECM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records buffers.
- A history DTC is stored.
Conditions for Clearing the MIL/DTC
- The MIL will turn off at the end of three (3) consecutive validation cycles in which the diagnostic runs without a fault.
- A history DTC will clear after 40 warm up cycles without a fault.
- DTC(s) can be cleared by using the scan tool.
Diagnostic Aids
With the ignition ON and the engine stopped, the manifold pressure is equal to atmosphere pressure and the signal voltage will be high.
The ECM as an indication of vehicle altitude uses this information. Comparison of this reading with a known good vehicle with the same sensor is a good way to check the accuracy of a suspect sensor. Readings should be the same ± 0.4 volt.
If a DTC P0107 is intermittent, refer to MAP Check for further diagnosis.
If the connections are OK monitor the manifold absolute pressure (MAP) sensor signal voltage while moving related connectors and the wiring harness. If the failure is induced, the display on the scan tool will change. This may help to isolate the location of an intermittent malfunction.
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DTC P0107 - Manifold Absolute Pressure Sensor Low Input