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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P1400 Through DTC P2635 >> DTC P2400-P2402 >> Circuit/System Verification

Circuit/System Verification

  1. Service Mode active, command the EVAP leak detection pump ON and OFF with a scan tool.
  2. Listen for the motor to run when commanded.
  3. 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 data.
NOTE: This EVAP leak detection pump is very quiet. You might feel it running rather than hear it.
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