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Home >> Cadillac >> 2010 >> DTS 4.6 9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0016 To P0341 >> DTC P0068 or P0121 >> Circuit/System Verification
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Circuit/System Verification

  1. Verify that DTCs P0101, P0106, or P0120 are not set.
  2. Ignition ON, observe the scan tool MAP Sensor parameter. The MAP Sensor parameter should be within the range specified for your altitude. Determine the altitude at your current location. Refer to Altitude Versus Barometric Pressure .
  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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