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Home >> Chevrolet >> 2006 >> Epica LTZ >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 2.0L (L34 GMDAT) - DTC P0137 To DTC P1171 >> DTC P1121 or P1122 >> Circuit/System Verification

Circuit/System Verification

  1. Verify that DTCs P0122 or P0123 are not set.
  2. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. DTC P1121 or P1122 should not set.
  3. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the FreezeFrame/Failure Records List.
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