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Home >> Chevrolet >> 2001 >> Impala V6-3.4L VIN E >> 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 >> Loop Status

Loop Status

The scan tool displays OPEN or CLOSED. Closed loop indicates that the PCM is controlling fuel delivery according to oxygen sensor voltage. In open loop, the PCM ignores the oxygen sensor voltage and bases the amount of fuel to be delivered on Throttle Position (TP) sensor, Engine Coolant Temperature (ECT), and MAF sensor inputs only.
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