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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P1635: 5-Volt Reference Low >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step number in the diagnostic procedures.

  1. 5

    A component that does not affect the reference voltage when reconnected is considered passed. When the last component is reconnected, disconnect one of the passed components to obtain the voltage measurement.

  2. 10

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