F 250 4WD Super Duty V10-6.8L VIN S (2001)
PCM malfunctions.
HO: High Output.
HO2S: Heated Oxygen Sensor. Formerly known as Heated Exhaust Gas Oxygen (HEGO) Sensor. Provides information on rich or lean exhaust
conditions to the PCM.
Hot Soak: Period of time after an engine operates where localized combustion heat dissipates throughout the engine.
HTR, HTR11, HTR12, HTR21 H1R22, HTRX1, HTRX2: HO2S Heater. Heater element for the HO2S sensor.
Hydrogen: Chemical symbol H. Highly flammable gas.
Hz: Hertz. Cycles per second.
IAC: Idle Air Control. Electrical control of throttle bypass air.
IAT: Intake Air Temperature.
IATV: Intake Air Temperature Voltage. Actual voltage drop across the IAT sensor.
IAT2: Intake Air Temperature 2. Displayed in either Fahrenheit or Centigrade. Used on supercharged vehicles.
IAT2V: Intake Air Temperature 2 Voltage. Actual voltage drop across the IATV2 sensor.
IC: Integrated Circuit. A small Semi-Conductor device capable of doing many separate circuit functions.
ICM: Ignition Control Module. The module that controls the ignition system.
IFDM: Integrated Fuel Delivery Module.
IFS: Inertia Fuel Shutoff.
IGN GND: Ignition Ground.
Ignition: System used to provide high voltage spark for internal combustion engines.
IGNKEY(IGKY): Ignition Key status.
IGNSW (IGSW): Ignition Switch Position.
IMRC: Intake Manifold Runner Control. Controls airflow through the high-speed runners in the intake manifold.
IMRCM: Intake Manifold Runner Control Monitor. Monitors the IMRC / circuits for faults.
IMTV: Intake Manifold Tuning Valve. Controls airflow through runners in a split intake manifold.
INJ1, INJ2, INJ3, INJ4, INJ5, INJ6, INJ7, INJ8, INJ9, INJ1O: lnjector number or its signal output from the PCM.
Injector: A device for delivering metered pressurized fuel to the intake system or the cylinders.
Intake Air: Air drawn through a filter and distributed to each cylinder for use in combustion.
Intercooler: See CAC.
IPATS: Integrated Passive Anti-Theft System.
ISO: international Standards Organization.
KAM: Keep Alive Memory. A portion of the memory within the PCM that must have power even when the vehicle is not operating.
KAPWR: Keep Alive Power. Dedicated, unswitched power circuit that maintains KAM.
Key On Engine Off Self- Test: A test of the EEC system conducted by the PCM with power applied and the engine at rest.
Key On Engine Running Self- Test: A test of the EEC system conducted by the PCM with the engine running and the vehicle at rest.
