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Home >> GMC >> 2010 >> Terrain SLT, 2.4 W, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 2.2L Or 2.4L - DTC P1255 To DTC P2635 >> DTC P1682 >> Circuit/System Verification

Circuit/System Verification

NOTE: On the scan tool, the engine control module relay is referred to as the engine controls ignition relay.
  1. Ignition ON, observe the DTC information with a scan tool. If DTCs P0685, P0689, or P0690 are set, diagnose those DTCs first. DTC P1682 should not set.
  2. Ignition ON, observe the scan tool Ignition 1 Voltage signal and the Engine Controls Ignition Relay Feedback Signal parameters. There should be no more than 3 V difference between the two parameters.
  3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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