Circuit Description

The Throttle Position (TP) sensor circuit provides a voltage signal relative to throttle position (blade angle). The throttle blade angle will vary from about 8 percent at closed throttle to about 92 percent at Wide Open Throttle (WOT). The DC motor circuit provides a voltage signal relative to command throttle position (blade angle). The Mass Air Flow (MAF) sensor measures the amount of air which passes through it into the engine during a given time. The Powertrain Control Module (PCM) uses the mass air flow information to monitor engine operating conditions for fuel delivery calculations. Large quantity of air entering the engine indicates an accelerator or high load situation, while a small quantity or air indicates deceleration or idle. The MAF sensor produces a frequency signal which can be monitored using a Tech 2. The frequency will vary within a range of around 4 to 7g/s at idle to around 25 to 40g/s at maximum engine load. This DTC detects that if the system is in Power Management Mode (Fail safe Mode).