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Home >> Pontiac >> 2001 >> Aztek Base, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1635: 5-Volt Reference "A" Circuit >> Code Enable Criteria

Code Enable Criteria

DTC will run when ignition is on and DTC will set when PCM detects a voltage out of range/tolerance on the 5-volt reference circuit for more than 10 seconds.

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