While this isnt complete, it should help...


ABS Anti-Lock Braking System.
ACT Air Charge Temperature (intake air, after filter)
ATX Automatic Trans.
BAP Barometric (atmosphere) Air Pressure sensor
CC Cruise Control
CCS
CEL Check Engine Light.
CFI Central Fuel Inj, also called Throttle Body inj
CPS Camshaft (or Crankshaft) Position Sensor - used for ignition, injection
timing
DPFE Differential Pressure Feedback, Exhaust - measures EGR flow
EECIV The Engine/Trans Computer system used from mid-80's - mid 90's
ECM Engine control Module (before trans control > PCM)
EFI Electronic fuel injection
EGO Exhaust Gas Oxygen sensor, also called O2 sensor
EGR Exhaust Gas Recirculation (valve).- reduce emissions by lowering
combustion temperatures
ECT Engine Coolant Temperature sensor
EGRVPS EGR Valve Position Sensor tells ECM/PCM how far the EGR valve is open
(Non-DPFE applications)
FP Fuel Pump
FPR Fuel Pressure Regulator
HEGO Heated Exhaust Gas Oxygen sensor, heated to reach op temp earlier, also
called O2 sensor
IAC Idle Air Control (valve). Also referred to previously as ISC, IABP
IAT Intake Air Temperature (sensor).
IMRC Intake Manifold Runner Control (late model, multi-valve variable
induction)
MAF Mass Air Flow (sensor).
MAP Manifold Air Pressure sensor..used in engines without MAF (speed-
density systems)

MTX Manual Trans
OBDII Standardized powertrain control system from mid 90's (depend on model)
PCM Powertrain Control Module (engine AND trans EEC).
PCV Positive Crankcase Ventilation (valve).
PIP Profile Ignition Pick-up - dist position pickup, ALSO the pulse sent TO
the ECM
SPOUT Spark Output, the ignition timing pulse sent back to the ignition
module based on PIP, engine RPM and sensor input
TB Throttle Body.
TC Traction Control.
TFI Thick Film Ignition - Ignition module used with EECIV, side of dist on
most models, remote on some later models.
TPS Throttle Position Sensor.
VSS Vehicle Speed sensor (with or instead of speedo cable)

Test terms:
KOEO Key On Engine OFF, pulls memory codes
KOER Key On Engine RUNNING, real time error info
WOT Wide Open Throttle.
Goose Test during KOER to test throttle position sensor and engine response
STI Self Test input, EEC - ground to start test
STO Self Test Output some time same electrical lead as the CEL, but
carries the test pulse or data.

Any other common terms I missed, feel free to reply