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Test Description

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

  1. 2. This step will determine if the 5-volt reference is present.
  2. 3. This step checks the ground circuit.
  3. 4. This step determines if the problem is currently active by the scan tool displaying Last Test Failed. Do not proceed any further with this table if the scan tool does not display the term Last Test Failed. Duplicating the conditions in Freeze Frame/Failure Records can help create an active fault.
  4. 5. This step determines if a High Resolution signal is being sent to the PCM. Refer to the RPM vs Hertz table to compare the Hertz readings at different RPMs. Using the Freeze Frame/Failure Records will help identify the problem.
  5. 9. The PCM supplies 5 volts on the signal circuit. This step determines if that voltage is present, not present, or too much voltage is present.
  6. 13. This step determines if the signal circuit is shorted to 5 volts. A normal high resolution signal circuit will have 3-5 mA. Any reading over 50 mA indicates a short to 5 volts.
Fig 1: DTC P0370 (Steps 1-7)
G01599778Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC P0370 (Steps 8-18)
G01599779Courtesy of GENERAL MOTORS CORP.
Fig 3: DTC P0370 (Steps 19-20)
G01599780Courtesy of GENERAL MOTORS CORP.
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