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Test Description

NOTE: The following numbered steps refer to circled numbers on diagnostic chart. See Fig 1 . For circuit identification, see Figure .
  1. This step checks for intermittent operating conditions.
  2. This step checks to see if there is an open in CKT 800D and 800E.
  3. If CKT 800 is OK, the problem is the PCM.
Fig 1: DTC B334: Loss Of PCM Data Diagnostic Flow Chart
G00072724Courtesy of GENERAL MOTORS CORP.
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