The manifold absolute pressure (MAP) sensor is a transducer that varies resistance
according to changes in intake manifold pressure (vacuum). The PCM measures the signal
voltage from the MAP sensor, which is a reduced value of the PCM 5 volt reference.
The voltage ranges from 1-1.5 volts at idle (low pressure/high vacuum)
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 PCM is below the calibrated voltage
value.
Conditions for Setting the DTC
DTC P0107 will set if MAP sensor voltage is less than 0.1 volts when:
| • | The condition exists for longer than 6 seconds. |
| • | Engine speed is less than 1,000 RPM. |
| • | No TP sensor DTCs have been set. |
| • | The condition exists for longer than 6 seconds. |
| • | Engine speed is greater than 1,000 RPM. |
| • | The TP angle is greater than 15 percent. |
| • | No TP sensor DTCs have been set. |
DTC P0107 diagnostic runs continuously with the engine running.
DTC P0107 is a type B DTC
Diagnostic Aids
To locate an intermittent problem, use the scan tool to monitor MAP sensor voltage
with the engine idling (high vacuum). Wiggling the wires while watching for a change
in MAP sensor voltage may locate the area where an open or short to ground in the
wiring could lie.
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.
The PCM supplies the MAP sensor with its own separate 5 volt reference
source. There are no other external components tied to it.
