Circuit Description
The manifold absolute pressure (MAP) sensor is a transducer that varies resistance
according to changes in 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 1-1.5 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.
DTC Parameters
DTC P0107 will set if MAP voltage is less than 0.14 volts when:
| • | Condition exists for longer than 0.2 seconds. |
| • | Engine speed is less than 1000 RPM. |
| • | No TP sensor DTCs have been set. |
| • | Condition exists for longer than 0.2 seconds. |
| • | Engine speed is greater than 1000 RPM. |
| • | TP angle is greater than 10%. |
| • | No TP sensor DTCs have been set. |
DTC P0107 diagnostic runs continuously with engine running.
P0107 is a (type B) DTC.
Diagnostic Aids
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.
To locate an intermittent problem, use Scan tool to monitor MAP voltage with
engine idling (high vacuum). Wiggling wires while watching for a change in MAP voltage
may locate the area where an open or short to ground in the wiring could lie.
If DTCs P0102, P0107, P0341 and P0405 are set, there may be an open in the 5 volt
reference circuit 416.
