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Home >> Pontiac >> 2006 >> Grand Prix Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 3.8L - DTC P0446 To P2108 >> DTC P0685 >> Circuit/System Verification

Circuit/System Verification

  1. With the ignition ON, engine OFF, command the powertrain relay ON and OFF several times using the scan tool output control function. You should either hear or feel the relay click with each command.
  2. With the ignition ON, engine OFF, probe both test points of each of the following fuses:
    • ETC Fuse
    • Emission 1 Fuse
    • The test lamp should illuminate on at least one test point of each fuse. If the test lamp does not illuminate continue with Circuit/System Testing.
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