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Home >> Pontiac >> 2001 >> Firebird Formula, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 5.7L >> Diagnostic Tests >> DTC P1639: 5-Volt Reference 2 Circuit >> Description

DTC P1639: 5-Volt Reference 2 Circuit: Description

Powertrain Control Module (PCM) uses a common 5-volt reference circuit as a sensor feed to A/C pressure sensor and Fuel Tank Pressure (FTP) sensor. PCM monitors voltage on 5-volt reference circuit.