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Home >> Saab >> 2000 >> 9-3 Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - TRIONIC T7 Fuel Control System >> Diagnostic Tests >> DTC P0452-P0453: Fuel Tank Pressure (Ftp) Sensor Circuit

DTC P0452-P0453: Fuel Tank Pressure (Ftp) Sensor Circuit

  1. Disconnect harness connector from FTP sensor on top of fuel tank. See Figure. Turn ignition on. Use DVOM to measure voltage between sensor harness connector terminal No. 1 (White/Black wire) and ground. If voltage is not between 4.9-5.1 volts, repair faulty circuit between FTP sensor harness connector terminal No. 1 and ECM harness connector terminal No. 46 (White/Black wire, changes to Grey wire from ECM). See Figure for ECM location. See Figure for ECM terminal identification. See appropriate wiring diagram in WIRING DIAGRAMS article. Go to step  5. If voltage reading is as specified, go to next step.
  2. Measure voltage between FTP sensor harness connector terminals No. 1 (White/Black wire) and 2 (Blue/White wire). If voltage reading is between 4.9-5.1 volts, go to next step. If voltage is not as specified, repair faulty circuit between FTP harness connector terminal No. 2 (Blue/White wire) and ECM harness connector terminal No. 70 (Black wire). Go to step  5.
  3. Connect TECH 2 scan tool to Data Link Connector (DLC). Select test value FUEL TANK PRESSURE. If scan tool display reads around -2.500 kPa, go to next step. If display is not as specified, repair faulty circuit between FTP sensor harness connector terminal No. 3 and ECM harness connector terminal No. 59 (Blue wire). Go to step  5.
  4. Connect a jumper wire between FTP sensor harness connector terminals No. 2 (Blue/White wire) and 3 (Blue wire). Recheck FUEL TANK PRESSURE value. If scan tool display reads around 2.500 kPa, replace FTP sensor. See FUEL TANK PRESSURE (FTP) SENSOR under ENGINE SENSORS & SWITCHES in REMOVAL, OVERHAUL & INSTALLATION article. If display is not as specified, repair faulty circuit between FTP sensor harness connector terminal No. 3 and ECM harness connector terminal No. 59 (Blue wire). Go to next step.
  5. Use scan tool to clear DTCs. Drive vehicle for 5 minutes under varying loads and engine RPM. Recheck for any stored DTCs. If DTC P0452-P0453 is present, substitute known good ECM and retest system. See ENGINE CONTROL MODULE (ECM) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article.
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