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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 2004 (Engine Controls And Fuel - 3.6L (Ly7) - DTC P1174 To DTC P2635) >> DTC P1682 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. If DTCs P0685, P0690, B1370, or B1380 are set, diagnose those DTCs first.
  2. Ignition ON, engine OFF, observe 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 2 volts difference, between the 2 parameters.
  3. Ignition OFF, observe the ignition 1 voltage signal parameter, on the scan tool. The parameter value should be 0 volts, before the ECM powers down.
    NOTE: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
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