Circuit Description

The powertrain control module (PCM)/engine control module (ECM) monitors various sensors to determine engine operating conditions. The PCM/ECM controls fuel delivery, spark advance transaxle operation, and emission control device operation based on sensor inputs.

The PCM/ECM provides a sensor ground to all of sensors. The PCM/ECM applies 5 volts through a pull-up resistor and monitors voltage present between sensor and resistor to determine status of Engine Coolant Temperature (ECT) sensor Intake Air Temperature (IAT) sensor, and Transmission Fluid Temperature (TFT) sensor. The PCM/ECM provides Exhaust Gas Recirculation (EGR) Pintle Position sensor, Throttle Position (TP) sensor, Manifold Absolute Pressure (MAP) sensor, and Fuel Tank Pressure sensor with a 5-volt reference and a sensor ground signal. The PCM/ECM monitors separate feedback signals from these sensors to determine their operating status.