Diagnostic Aids

Use the Freeze Frame and/or Failure Records data in order to locate an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data may help determine the number of miles since the DTC set. The Fail Counter and Pass Counter can also help determine the number of ignition cycles that the diagnostic test reported a pass and/or fail. Operate the vehicle within the same freeze frame conditions including those for RPM, for engine load, for vehicle speed, for temperature, and for others. This will isolate at what point the DTC failed.

Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS .

Fig 1: DTC P1665 (1 Of 2)

Courtesy of GENERAL MOTORS CORP.

Fig 2: DTC P1665 (2 Of 2)

Courtesy of GENERAL MOTORS CORP.