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Home >> Pontiac >> 2006 >> Grand Prix Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - 3.8L - DTC P0446 To P2108 >> DTC P1404 >> Circuit/System Testing

Circuit/System Testing

  1. With the ignition ON and the engine OFF, observe the DTC information on the scan tool.
  2. Start the engine and observe the EGR Position parameter. The EGR Position parameter should be less than 1 percent.
  3. Disconnect the EGR harness connector and observe the EGR Position Sensor parameter. The EGR Position Sensor parameter should display 0 percent.
    • If the EGR Position Sensor parameter is more than 0 percent test the EGR Position Sensor signal circuit for a short to voltage or a faulty control module.
  4. Command the EGR valve from 0 percent to 100 percent with a scan tool, and observe the EGR Position Variance parameter. The EGR Position Variance parameter should be less than 15 percent.
    • If the EGR Position Variance parameter is more than 15 percent test the EGR 5-volt reference circuit and the EGR Low Reference circuit for an open or high resistance, or a faulty control module.
  5. Using a 3-amp fused jumper wire jumper the EGR 5-volt reference circuit to the EGR Position Sensor Signal circuit at the EGR harness connector and monitor the EGR Position Sensor parameter. The EGR Position Sensor parameter should display 99 percent.
    • If the EGR Position Sensor parameter is less than 99 percent test for an open, high resistance, or a short to ground in the EGR Pintle Position Signal circuit.
  6. Disconnect the control module and measure the resistance of the EGR High Control circuit and the EGR Low Control circuit. There should be less than 3 ohms of resistance on each circuit.
    • If the resistance is more than 3 ohms, test each circuit for high resistance.
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