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P/B
Power Brakes
P/E
Power Enrichment
P/N
Part Number
P/S
Power Steering
PA
Pressure Air (Honda)
PAFS
Pulse Air Feeder System (Chrysler)
PAIR
Pulsed Secondary Air Injection
PARALLEL CIRCUIT
A circuit in which there are two or more paths for current flow.
PAS
Power Assisted Steering
PAS
passive Anti-Theft System
PASS
Personalized Automotive Security System
PC
Pressure Control
PCB
Printed Circuit Board
PCI
Programmable Communications Interface
PCM
Powertrain Control Module
PCM (POWERTRAIN CONTROL MODULE )
Generic term used to refer to the arrangement controllers/computers which control the engine management system, emissions systems, and the shift operations of automatic transmissions. This term is Federally mandated to standardize the terminology of engine management computers (beginning in the 1993 model year).
PCS
Pressure Control Solenoid
PCV
Positive Crankcase Ventilation
PCV (POSITIVE CRANKCASE VENTILATION)
A system which vents vapors from the crankcase into the engine intake system where they are burned in the engine cylinders rather than being discharged in the exhaust gases.
PECV
Power Enrichment Control Valve
Pending Code
A code recorded on the "first trip" for a "two-trip" code. If the fault that caused the code to be set is not detected on the second trip, the code is automatically erased.
PF
Purge Flow Sensor
PFE
Pressure Feedback EGR sensor or its circuit.
PFI
Port Fuel Injection
PFI/MFI
General abbreviation for Port or Multi-port Fuel Injection.
PGM-FI
Programmed Gas Management Fuel Injection (Honda)
PID
Parameter Identification
PID SUP
Parameter Identification Supported
PIP
Profile Ignition Pickup.
PIV
Peak Inverse Voltage
PKE
Passive Keyless Entry
PMD
Pump Mounted Driver
PNP
Par Neutral Position
PORTED VACUUM SWITCH
Temperature actuated switch that changes vacuum connections when the coolant temperature changes.
POT
Potentiometer
POTENTIOMETER (POT)
A variable resistor with three connections. The two ends of the resistive element each constitute one connection. The third connection (called the wiper) moves physically up and down the resistive element to vary the resistance of the device.
POWER LOSS LAMP
Term for the instrument panel-mounted lamp on early Chrysler vehicles (functions the same as the Check Engine Light).
POWER MODULE
A microprocessor which delivers commands from the on-board computer's Logic Module to the various actuators in the vehicle's engine control system.
Power Steering Pressure Switch
Signal is used by computer to compensate for power steering loads.
POWERTRAIN CONTROL MODULE (PCM)
Same as ECM, but also controls electronically controlled automatic transmission. The PCM is the OBD 2 accepted term for the vehicle's "on-board computer." In addition to controlling the engine management and emissions systems, the PCM also participates in controlling the powertrain (transmission) operation. Most PCMs also have the ability to communicate with other computers on the vehicle (ABS, ride control, body, etc.).
PPM
Parts Per Minute
PPS
Ported Pressure Switch (Ford)
PR
Pressure Relief
PRC
Pressure Regulator Control
PRESSURE REGULATOR
A device which controls the pressure of the fuel delivered to the fuel injector(s).
PRIMARY WINDING
The low voltage winding of the ignition coil which is electronically connected to its secondary winding only by the magnetic field they share. When the primary winding is connected across the supply voltage, a potential current flows through it, building a magnetic field around itself, and inducing a voltage in the secondary winding. When the primary winding is disconnected, the cease in current through the primary winding again induces a voltage in the secondary winding which provides current to the spark plugs to ignite the air/fuel mixture.
PRNDL
Switch
PROFILE IGNITION PICKUP
A Hall effect vane switch that furnishes crankshaft position data to the EEC-IV processor.
PROM
Programmable Read Only Memory.
PS
Power Steering
PSA
Pressure Switch Assembly
PSC
Power Steering Control
PSI
Pounds Per Square Inch
PSOM
Programmable Speedometer Odometer Module
PSOV
Purge Shut Off Valve (Ford)
PSP
Power Steering Pressure
PSPS
Power Steering Pressure Switch
PTC
Positive Temperature Coefficient Resistor
PTO
Power Take Off (4WD Option)
PTOX
Periodic Trap Oxidizer
PTU
Part Throttle Unlock
PULSE
An abrupt change in a voltage either (positive or negative).
PVA
Ported Vacuum Advance
PVS
Ported Vacuum Switch
PWM
Pulse Width Modulation
PWR GND
Power Ground for PCM
