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Home >> Chevy Truck >> 1999 >> K 2500 Truck 4WD V8-5.3L VIN T >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Scan Tool Testing and Procedures >> Scan Tool Data, Normal Values and Definitions >> Scan Tool Data Definitions - Powertrain Systems >> A/C Request

A/C Request

The scan tool displays Yes or No. The A/C Request displays the state of the A/C request input circuit from the HVAC controls. The PCM uses the A/C request signal in order to determine whether the A/C compressor operation is being requested. Actual EGR Position: The scan tool displays a range of 0%-100%. The PCM supplies a Pulse Width Modulated (PWM) duty cycle to control the EGR valve. 0% indicates no EGR flow; 100% indicates full EGR flow.
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