Ford 2003 Mustang Workshop Manual page 2194

SECTION 303-14: Electronic Engine Controls
DESCRIPTION AND OPERATION
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
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.
2003 Mustang Workshop Manual