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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, P0689, P0690, 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 3 volts difference, between the two 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.
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