Manifold Pressure/Vacuum Sensor: Testing and Inspection

MAP Sensor - Mounted To Plenum:

Fig. 1 MAP Sensor:

Fig. 2 MAP Sensor Cross Section:

Relevant Diagnostic Trouble Codes
P0106
P0107
P0108
P0125
P1106
P1107
P1108

Monitoring Procedure
The sensor output is continuously monitored for high and low value. If a sustained high or low engine control module (ECM) input (indicating a harness or connector fault) is seen, the relevant diagnostic trouble code (DTC) is stored.

The sensor output voltage is monitored during sustained acceleration at low engine speed following an idle period. If the change in output is significantly less than the expected value then the range / performance failure judgement is made. The DTC is stored if the failure judgement is made on two successive trips.

MAP Sensor
The MAP Sensors measure the absolute pressure in each inlet manifold. A MAP Sensor is mounted to the rear of each inlet manifold, connected to the manifold via pipes and filters. They are electronically connected to inputs to the ECM and provide a voltage output that is directly proportional to absolute pressure.

MAP Gas filter (Fig. 3)

Fig. 3 MAP Gas Filter Section:

This filter is mounted on the manifold negative pressure output port to reduce the amount of gasoline, oil or other foreign matter that might otherwise contaminate the sensor.