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Home >> Chevrolet >> 2006 >> Optra LS, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 2.0L (L34 GMDAT) - DTC P0016 To DTC P0402 >> DTC P0068 >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition ON, observe the manifold absolute pressure (MAP) sensor pressure parameter and compare the reading on the scan tool to the barometric pressure table. Refer to .
    • If the MAP sensor pressure is not within the range specified for your altitude, refer to DTC P0107 or P0108 .
  2. Start the engine, observe the MAP Sensor parameter. The reading should be between 32-42 kPa.
  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 Freeze Frame/Failure Records Data List.