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Home >> Oldsmobile >> 2003 >> Aurora >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1634: Improper Ignition 1 Input >> Conditions For Setting DTC
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Conditions For Setting DTC

No Class II serial data circuit problem.



The PCM detects an improper ignition 1 voltage signal.

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