Ford Mustang Service Manual: Idle Air Control (IAC) Valve - Mach I
Electronic Engine Controls (Description and Operation)
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.
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.
Idle Air Control (IAC) Valve - Cobra
Electronic Engine Controls (Description and Operation) The electronic engine controls consist of the following: powertrain control module (PCM) throttle position (TP) sensor idle air contr ...Cylinder Head Temperature (CHT) Sensor - 3.8L
Electronic Engine Controls (Description and Operation) The electronic engine controls consist of the following: powertrain control module (PCM) throttle position (TP) sensor idle air contr ...Other materials:
Exhaust Manifold to Exhaust Gas Recirculation (EGR)
Valve Tube - Mach I
Engine Emission Control (Description and Operation)
CAUTION: Do not remove any part of the engine emission control system.
Operating the
engine without the engine emission control system will reduce fuel economy and
engine
ventilation. This will weaken engin ...
Installation
Removal
WARNING: Do not smoke or carry lighted tobacco or open flame of any
type when
working on or near any fuel related components. Highly flammable mixtures are
always present
and may be ignited. Failure to follow these instructions may result in personal ...
Engine (Removal)
Engine Component View
Cylinder Heads and Valve Train Components
Engine Front Cover Components
Engine Components
Cylinder Block and Lower End Components
Engine (DIAGNOSIS AND TESTING)
Refer to Section for basic mecha ...