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Home >> Chevrolet >> 2009 >> Impala Police >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 3.9L - DTC P0341 To DTC P2544 >> DTC P1682 >> Circuit/System Verification
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Circuit/System Verification

IMPORTANT: On the scan tool, the powertrain relay is referred to as the EC ignition relay.
  1. If DTCs P0685 or 0690 are set, diagnose those DTCs first.
  2. Ignition ON, engine OFF, observe both the Ignition 1 Voltage signal and the EC Ignition Relay Feedback signal parameters on the scan tool. Both parameter values should display no more than 3 volts difference between the 2 parameters.
    • If the vehicle passes the Circuit/System Verification test, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that are captured in the Freeze Frame/Failure Records data list.