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Home >> Chevrolet >> 2006 >> Chevy Express G2500, Van Cargo Extended, 6.6 2 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 6.6L (LLY) - DTC P0401 To DTC P268A >> DTC P0406 >> Circuit/System Testing

Circuit/System Testing

  1. Test for shorted terminals and poor connections at the EGR valve.
  2. With the ignition ON and the EGR valve disconnected, observe that the EGR Position parameter on the scan tool is 0 volts.
    • If the EGR Position parameter is more than 0 volts, test the signal circuit for a short to voltage or for a faulty ECM.
  3. With the ignition ON and the EGR valve disconnected, measure for 5 volts between the 5-volt reference circuit of the EGR valve and the low reference circuit of the EGR valve.
    • If the voltage is less than 5 volts, test the for an open in the low reference circuit of the EGR valve or for a faulty ECM.
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