Electronic Engine Controls

The electronic engine controls consist of the following:
^ Powertrain Control Module (PCM)
^ Throttle Position (TP) sensor
^ Idle Air Control (IAC) valve
^ Engine Coolant Temperature (ECT) sensor
^ cylinder head temperature sensor
^ Camshaft Position (CMP) sensor
^ Crankshaft Position (CKP) sensor
^ Mass Air Flow (MAF) sensor
^ Intake Air Temperature (IAT) sensor
^ Heated Oxygen Sensor (HO2S) - front
^ catalyst monitor sensor - rear
^ wheel speed sensor
^ engine water temperature sensor

The powertrain control module needs the following inputs to calibrate the engine correctly:
^ crankshaft position
^ engine rpm
^ engine load (manifold pressure)
^ atmospheric (barometric) pressure
^ engine coolant temperature

The throttle position sensor:
^ sends the powertrain control module a signal indicating the throttle plate angle.
^ is the main input to the powertrain control module from the driver.

The idle air control valve:
^ controls bypass air around the throttle plate at low speeds.
^ is controlled by the powertrain control module.

The cylinder head temperature sensor:
^ provides a gauge signal for coolant temperature.
^ is mounted on rear of LH cylinder head.
^ sends the powertrain control module a signal indicating engine temperature.
^ resistance decreases as coolant temperature increases.

The camshaft position sensor:
^ sends the powertrain control module a signal indicating camshaft position, used for fuel synchronization.

The crankshaft position sensor:
^ sends the powertrain control module a signal indicating crankshaft position.
^ is essential for calculating spark timing.

The mass air flow sensor:
^ sends the powertrain control module a signal indicating mass air flow rate of air entering the engine.

The intake air temperature sensor:
^ sends the powertrain control module a signal indicating the temperature of the air entering the engine.

The heated oxygen sensor:
^ has the ability to create a voltage signal depending on exhaust oxygen content.
^ provides feedback information to the powertrain control module used to calculate fuel delivery.

The rear catalyst monitor sensor:
^ monitors oxygen content after the oxygen flows through the catalytic converter.
^ provides a voltage to the powertrain control module used to calculate catalytic converter integrity.

The wheel speed sensor:
^ sends a signal to the powertrain control module indicating wheel speed.