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Home >> Saturn >> 1998 >> SW1 Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1639 - TCM A/D Failure >> Circuit Description
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Circuit Description

The PCM receives analog voltage signals from various sensors. The Analog/Digital (A/D) converter changes these signals to a digital signal. This DTC sets when the A/D becomes faulty in the TC.