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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1635: 5-Volt Reference 1 Circuit >> Code Enable Criteria

Code Enable Criteria

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For DTC to run, the engine must be running. DTC will set when PCM detects a voltage out of tolerance condition on 5-volt reference No. 1 circuit for longer than 10 seconds.