Circuit Description

Engine load is determined using a "speed density" method. This method is calculated using inputs from Manifold Absolute Pressure (MAP) sensor, Crankshaft Position (CKP) sensor, Intake Air Temperature (IAT) sensor and engine RPM. The MAP sensor is the main sensor used to calculate engine load. Powertrain Control Module (PCM) supplies a 5-volt reference signal and a ground circuit to MAP sensor. As manifold pressure changes, MAP sensor input voltage to PCM varies from less than 2 volts at idle to greater than 4 volts at Wide Open Throttle (WOT). If PCM detects a MAP sensor input voltage that is excessively low, DTC P0107 will be set.

Conditions required to set DTC are:

• No TP sensor DTCs present.
• Engine is running.
• System voltage is greater than 11 volts.
• Throttle angle is greater than zero percent if engine speed is 1300 RPM or less.
• Throttle angle is greater than 5 percent if engine speed is greater than 1300 RPM.
• MAP sensor indicates manifold absolute pressure less than 11 kPa for about 10 seconds.