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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 31 (ENGINE CONTROLS - 6.6L - DIAGNOSIS (DTCs P0402-P2636)) >> DTC P0405 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. With the ignition ON and the EGR valve disconnected, measure the voltage from the 5-volt reference circuit of the EGR valve to a good ground and observe that the DMM measures 4.98-5.02 volts.
    • If the voltage is less than 4.98 volts, test for an open in the 5-volt reference circuit or for a faulty ECM.
  2. With the ignition ON and the EGR valve disconnected, connect a jumper wire between the 5-volt reference circuit of the EGR valve and the signal circuit of the EGR valve and observe with a scan tool that the EGR sensor parameter displays 4.98-5.02 volts.
    • If the EGR Sensor parameter is less than 4.98 volts, test the signal circuit for an open or short to ground, high resistance, or for a faulty ECM.
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