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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 3.4L - DTC P0401 To DTC P2544) >> DTC P0451, P0452, P0453, or P0454 >> Circuit/System Testing >> P0452 and P0453

P0452 and P0453

WARNING: This page is about a different variant/trim than selected.
  1. If DTC P0641 is set, repair that DTC first.
  2. With the ignition OFF, disconnect the harness connector at the FTP sensor.
  3. With the ignition ON, the scan tool FTP sensor parameter should indicate 0 volts.
    • If the parameter is more than 0 volts, test for unexpected voltage at the signal circuit. If the circuit tests normal, replace the ECM.
  4. With the ignition ON, measure for 4.8-5.2 volts between the 5-volt reference circuit of the FTP sensor and ground.
    • If over 5.2 volts, test for unexpected voltage at the 5-volt reference circuit. If the circuit tests normal, replace the ECM.
    • If under 4.8 volts, test for a short to ground, or open/high resistance at the 5-volt reference circuit. If the circuit tests normal, replace the ECM.
  5. With the ignition ON, the scan tool FTP sensor parameter should indicate 4.8-5.2 volts with a 3A fused jumper wire connecting the FTP signal circuit to the 5-volt reference circuit.
    • If under 4.8 volts, test for a short to ground or an open at the signal circuit. If the circuit tests normal, replace the ECM.
    • If the circuits and ECM test OK, replace the FTP sensor.
  6. With the ignition OFF and the ECM powered down, measure for less than 5 ohms between the low reference circuit of the FTP sensor and a good ground.
    • If greater than 5 ohms, test for an open/high resistance in the circuit. If the circuit tests normal, replace the ECM.
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