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Home >> Chevrolet >> 2003 >> Corvette Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1639: 5-Volt Reference B Circuit >> Test Description
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Test Description

The number below refers to the step number in the diagnostic procedures.

  1. 9

    A short to voltage on the signal circuit of the FTP sensor will backfeed through the sensor into the 5-volt reference circuit and set this DTC.

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