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Home >> Pontiac >> 2003 >> Aztek AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics >> Diagnostic Tests >> DTC P1635: 5-Volt Reference 1 Circuit >> Test Description
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Test Description

The number below refers to the step number in the diagnostic procedures.

  1. 12 -  This vehicle is equipped with a PCM which utilizes an Electrically Erasable Programmable Read Only Memory (EEPROM). When the PCM is being replaced, the new PCM must be programmed.

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