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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 151 (Engine Controls And Fuel - 3.4L - DTC P0401 To DTC P2544) >> DTC P0451, P0452, P0453, or P0454 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

P0451 and P0454

    IMPORTANT: Refer to the J 41413-200  operation manual for detailed instructions.
  1. Start the engine with the J 41413-200  connected to the fuel filler neck.
  2. Allow the engine to idle.
  3. Use the Purge/Seal function to seal the system with a scan tool.
  4. Command the EVAP canister purge solenoid valve to 30 percent.
  5. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool.
  6. Allow the vacuum to increase on the gage of the J 41413-200  until it reaches approximately 16 inches H2O, or until the vacuum reached the abort limit on the scan tool.
  7. Use the Purge/Seal function to seal the system with a scan tool.
  8. If the difference between the FTP parameter on a scan tool and the vacuum/pressure gage on the J 41413-200  is more than 1 inch H2O, replace the FTP sensor.
  9. If the Fuel Tank Pressure Sensor parameter on a scan tool display is less than 3.2 volts, replace the FTP sensor.

P0452 and P0453

  1. Ignition OFF, disconnect the harness connector at the FTP sensor.
  2. Ignition OFF, ensure that the ECM completely powers down and test for less than 5 ohms between the low reference circuit terminal 2 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the control module.
  3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 3 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the control module.
  4. Verify the scan tool FTP sensor parameter is less than 0.2 volt.
    • If greater than the specified range, test the signal circuit terminal 1 for a short to voltage. If the circuit tests normal, replace the control module.
  5. Install a 3A fused jumper wire at the signal circuit terminal 1 and the 5-volt reference circuit terminal 3. Verify the scan tool FTP sensor voltage parameter is greater than 4.7 volts.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the control module.
  6. If all circuits test normal, replace the FTP sensor.
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