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Home >> Cadillac >> 2006 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.6L - DTC P0016 To P0401 >> DTC P0068 or P0121 >> Circuit/System Verification
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Circuit/System Verification

IMPORTANT: If you cannot duplicate the condition, 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.
  1. If DTCs P0101, P0106, or P0120 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
  2. With the ignition ON and the engine OFF, observe the MAP sensor parameter with a scan tool. The MAP should be within the range specified for your altitude. Determine the altitude at your current location and refer to Altitude vs Barometric Pressure .
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