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Test Description

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The numbers below refer to the step numbers on the diagnostic table.

  1. 3. This step tests for a voltage signal from the PCM.
  2. 4. This step tests for a missing or erratic vehicle speed signal from the PCM. An assistant may be required to perform this test.
Fig 1: DTC C0055 (Steps 1-3)
G01481781Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC C0055 (Steps 4-10)
G01481782Courtesy of GENERAL MOTORS CORP.
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