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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1991 (Engine Controls And Fuel - 3.6L (LCS) - DTC P0192 To DTC P0629) >> DTC P0452 or P0453 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, open the hood to disable the Auto-Stop function.
  2. Ignition ON, verify the scan tool hood position parameter displays Open.
    • If the hood position does not display Open, refer to DTC P254F .
  3. Ignition OFF, remove the fuse that supplies B+ to terminal X2-56 of the ECM.
  4. Disconnect the FTP Sensor harness connector.
  5. Test for less than 5 Ω between the low reference circuit terminal E 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.
  6. Install the fuse that supplies B+ to terminal X2-56 of the ECM.
  7. Ignition ON, test for 4.8-5.2 V between the 5-volt reference circuit terminal C 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.
  8. Observe the scan tool FTP sensor parameter. Verify that the FTP Sensor parameter is less than 4.8 V
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit/connections test normal, replace the ECM.
  9. Install a 3 A fused jumper wire between the signal circuit terminal B and the 5-volt reference circuit terminal C. Verify that 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.
  10. If all circuits/connections test normal, test or replace the FTP sensor.
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