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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 150 (Engine Controls And Fuel - 3.6L - DTC P0335 To P2105) >> DTC P0452 or P0453 >> 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.
  1. Ignition OFF, remove the fuse that supplies B+ to terminal 56-X2 of the ECM.
  2. Disconnect the X-406 harness connector at the rear of the fuel tank.
    3. NOTE: Testing for steps 3-7 is performed on the ECM side of the X-406 harness connector.
  3. Ignition OFF, test for less than 5 Ω between the low reference circuit terminal G and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit/connections test normal, replace the ECM.
  4. Install the fuse that supplies B+ to terminal 56-X2 of the ECM.
  5. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminal E and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or open/high resistance. If the circuit/connections test normal, replace the ECM.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  6. Verify the scan tool FTP Sensor parameter is less than 4.8 V.
    • If greater than the specified value, test the signal circuit terminal F for a short to voltage. If the circuit/connections test normal, replace the ECM.
  7. Install a 3 A fused jumper wire between the signal circuit terminal F and the 5-volt reference circuit terminal E. Verify the scan tool FTP Sensor parameter is greater than 4.8 V.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
  8. Remove the fuel tank. Refer to Fuel Tank Replacement (AWD) or Fuel Tank Replacement (FWD) .
  9. Disconnect the FTP sensor connector.
  10. Inspect the FTP sensor circuits in the fuel tank harness, between the FTP sensor connector and X-406 for the following conditions, and repair as necessary:
    • Damaged wiring or terminals
    • Open circuits
    • Short to ground
    • Wire to wire short
  11. If all circuits/connections test normal, test or replace the FTP sensor.
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