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P0105

Ignition ON Engine OFF Voltage:




Schematic:






The PCM has internal tables that compare MAP sensor values with TP sensor values. The Manifold Absolute Pressure (MAP) sensor is a transducer that varies resistance according to changes in intake manifold pressure (vacuum). The voltage ranges from 1-1.5 volts at idle (low pressure/high vacuum) to 4-4.5 volts at wide open throttle (high pressure/low vacuum). The Throttle Position (TP) sensor is a potentiometer that varies resistance according to changes in throttle plate position. The voltage ranges from 0.4 (±0.2) volts at 0% throttle to 4.7 volts at wide open throttle. DTC P0105 sets when the two values are out of the calibrated range from the table values.

DTC PARAMETERS
DTC P0105 will set if MAP voltage or TP sensor voltage is out of range for 2 seconds when:
^ Engine speed is between 1600 and 4000 RPM
^ Engine speed change is less than 100 RPM
^ EGR command is steady
^ IAC change is less than 10 counts
^ A/C command is unchanged
^ No P0601, P0602, P1635, EGR, IAC, MAP or TP sensor DTCs have been set.

DTC P0105 diagnostic runs continuously once the above conditions have been met.

DTC P0105 is a type B DTC.

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

Check PCM and MAP/TP sensors for corrosion in connectors.

Use Scan tool to monitor TP SENSOR as accelerator pedal is slowly depressed. The voltage should change smoothly from 0.4 volts at 0% throttle, to 4.7 volts at wide open throttle (±0.2 volts).

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.