Ford NEW GENERATION STAR TESTER, Introduction Manual

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GLOSSARY GLOSSARY-13
GLOSSARY
VIM: Vehicle Interface Module. Part of the NGS. Also referred to as the Diagnostic Link Module (DLM).
VMV: Vapor Management Valve.
VOM: Volt-Ohm-Amp Meter.
VPWR: Vehicle Power is a switched circuit that provides power to the EEC system. Compare “Battery
Positive Voltage (B+).”
VREF: Referenced Voltage usually 5 Vdc.
VRS: Variable Reluctance Sensor.
VSS: Vehicle Speed Sensor is a sensor which provides vehicle speed information.
WAC: Wide Open Throttle A/C Clutch Cutout that turns A/C system off during wide open throttle or
certain other operating conditions.
Warm-Up Cycle: Warm-Up cycle is vehicle operation, after an engine off period, with engine coolant
temperature rising at least 40 degrees Fahrenheit and reaching at least l60 degrees Fahrenheit.
WOT: Wide Open Throttle is a condition of maximum opening of the throttle plate in the throttle body.
WSS: Wheel Speed Sensor.
WU-OC: Warm-Up Oxidation Catalytic Converter is a catalytic converter system designed to lower HC
and CO emissions during engine warm-up. Usually located in or near the exhaust manifold.
WU-TWC: Warm-Up Three Way Catalytic Converter is a catalytic converter system designed to lower
HC, CO and NOx emissions during engine warm-up. Usually located in or near the exhaust manifold.
ZVS: Zoned Vacuum Switch.