The manifold absolute pressure (MAP) sensor is a transducer that varies resistance according to changes in the intake manifold pressure (vacuum). The ECM measures the signal voltage from the MAP sensor, which is a reduced value of the ECM 5-volt reference. The voltage ranges from 1.0-1.5 volts at idle (low pressure/high vacuum), in park at a normal operating temperature with all accessories Off, to 4.5-4.8 volts at wide open throttle (high pressure/low vacuum). DTC P0107 sets when the MAP sensor signal voltage at the ECM is below the calibrated voltage value.
DTC Parameters
DTC P0107 will set if the MAP sensor signal voltage is less than 0.14 volts when:
| • | The condition exists for longer than 0.2 seconds. |
| • | The engine is running. |
DTC P0107 diagnostic runs continuously once the above condition have been met.
P0107 is a type B DTC.
Diagnostic Aids
To locate an intermittent problem, use the scan tool to monitor the MAP sensor voltage with the engine idling (high vacuum). Wiggling the wires while watching for a change in the MAP sensor voltage may locate the area where an open or short to ground in the wiring could lie.
Circuit 416 (CMP/EGR/MAF/MAP sensor), circuit 2709 (AC pressure/fuel tank pressure sensor) and circuit 1164 (APP sensor 1) share the same 5-volt reference supply (5 volt Ref-A).
The CMP/ECT/IAT/EGR/MAF/MAP/TP1/TP2 sensors share the same sensor return circuit 652.
Important: Inaccurate readings will occur if resistance measurements are taken on a MAP sensor. The MAP sensor contains an internal amplifier circuit that requires applied voltage to function properly.
