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Home >> Oldsmobile >> 2003 >> Bravada AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.2L >> Diagnostic Tests >> DTC P0453: EVAP System Pressure Sensor - High Input >> Diagnostic Procedures

Diagnostic Procedures

  1. Did you perform the Diagnostic System Check - Engine Controls? If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition off. Remove fuel cap. Turn ignition on, with engine off. Observe the Fuel Tank Pressure Sensor parameter with a scan tool. Is the Fuel Tank Pressure Sensor parameter more than 4.3 volts? If yes, go to step  4. If no, go to next step.
  3. Observe the Freeze Frame/Failure Records for this DTC. Turn ignition off for 30 seconds. Turn ignition on, with engine off. Operate the vehicle within the Conditions For Running the DTC. See CONDITIONS FOR RUNNING DTC . You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. Did the DTC fail this ignition? If yes, go to next step. If no, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES - 4.2L BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article.
  4. Install fuel cap. Disconnect the FTP sensor. Observe the Fuel Tank Pressure Sensor parameter with a scan tool. Is the Fuel Tank Pressure Sensor parameter more than 0.2 volt? If yes, go to next step. If no, go to step  7.
  5. Probe the ground circuit of the FTP sensor with a test light that is connected to battery voltage. Does the test light illuminate? If yes, go to next step. If no, go to step  8.
  6. Measure the voltage of the FTP 5-volt reference circuit with a DVOM. Is the Fuel Tank Pressure Sensor parameter within 4.8-5.2 volts? If yes, go to step  10. If no, go to step  11.
  7. Test the FTP sensor signal circuit for a short to voltage or for a short to a 5-volt reference circuit. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  8. Test the FTP ground circuit for an open. Did you find and correct the condition? If yes, go to step  14. If no, go to next step.
  9. Test for an intermittent and for a poor connection at the control module. Did you find and correct the condition? If yes, go to step  14. If no, go to step  13.
  10. Test for an intermittent and for a poor connection at the FTP sensor. Did you find and correct the condition? If yes, go to step  14. If no, go to step  12.
  11. Repair short to voltage in the FTP 5-volt reference circuit. After repairs, go to step  14.
  12. Replace FTP sensor. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. After replacing sensor, go to step  14.
  13. Replace PCM. See REMOVAL & INSTALLATION - BRAVADA, ENVOY, ENVOY XL, TRAILBLAZER & TRAILBLAZER EXT article. Reprogram PCM. See POWERTRAIN CONTROL MODULE  under PROGRAMMING. After repairs, go to next step.
  14. Clear the DTCs with scan tool. Turn ignition off for 30 seconds. Start engine. Operate vehicle within the Conditions For Running DTC. See CONDITIONS FOR RUNNING DTC . Does the DTC run and pass? If yes, go to next step. If no, go to step  2.
  15. Observe the stored information, Capture Info with scan tool. Does scan tool display any DTCs that you have not diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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