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Home >> Chevrolet >> 1998 >> Monte Carlo LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Controls - Tests W/Codes - 3.8L) >> Diagnostic Trouble Codes >> DTC P1639 - 5-Volt Reference "B" Circuit >> Diagnostic Aids

Diagnostic Aids

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Check for faulty connections or damaged harness. Observe scan tool A/C PRESSURE display while moving harness and connectors related to A/C refrigerant pressure sensor. A change in scan tool display indicates fault location.