Circuit Description

PCM supplies a 5-volt reference signal and a ground circuit to both the MAP sensor and TP sensor. MAP sensor returns a signal to PCM relative to intake manifold pressure, and TP sensor returns a signal to PCM relative to throttle plate opening.

PCM can determine if sensors are out of range by comparing sensor values to expected limits predetermined by PCM during all modes of operation. DTC P0105 will set if MAP sensor is out of an expected range as determined by engine calibration.

For duplication of DTC, ensure:

• DTCs P0107, P0108, P0117, P0118, P0122, P0123, P0131, P0132, P0171, P0172, P0200, P0300, P0301, P0302, P0303, P0304, P0325, P0341, P0342, P0440, P0442, P0502, P0506, P0507 or P1441 is not set.
• Ensure engine speed is greater than 600 RPM.
• TCC is stable within one percent.
• Engine speed is stable within 50 RPM.
• IAC valve is stable within 5 counts.
• TP sensor is stable within 2 percent.