P0105

Schematic:

Ignition ON Engine OFF Voltage:

The PCM has internal tables that compare MAP sensor values with TP sensor values. The MAP sensor is a variable resistor that responds to changes in intake manifold pressure. The voltage ranges from 1-1.5 volts at idle (high manifold vacuum) to 4.5-4.8 volts at wide open throttle (low manifold vacuum). The TP sensor is a potentiometer which responds to changes in throttle plate angle. At a closed throttle position, output of the sensor is low (approximately 0.35 volts). As the throttle plate opens, the output signal increases so that at wide open throttle, the output will be high (over 4.65 volts).

DTC PARAMETERS
DTC P0105 will set if MAP value is out of range greater than 9 seconds when:
^ DTCs P0107, P0108, P0117, P0118, P0122, P0123, P0131, P0132, P0171, P0172, P0201, P0202, P0203, P0204, P0300, P0336, P0340, P0341, P0440, P0442, P0502, P0506, P0507, or P1441 are not set.
^ Engine speed between 600-6375 rpm (automatic) or 900-6375 rpm (manual).
^ RPM change is less than 50 rpm.
^ Engine run time is greater than 40 seconds.
^ TCC change is less than 2.5%.
^ IAC change is less than 5 counts.
^ Throttle angle changes less than 2%.

DIAGNOSTIC AIDS
This DTC will set if either MAP or TP is out of range. To distinguish which one failed, review malfunction history information and attempt to duplicate the conditions.

Check sensor and PCM connection for corrosion.

With the engine Off and key On, the MAP reading should be the same as the barometric reading because manifold pressure is equal to atmospheric pressure (no vacuum - high voltage). Comparing this reading to a known good vehicle with the same sensor is a good way to check accuracy of a suspect sensor. Readings should be within 0.4 volts.