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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 448 (Engine Controls Self-Diagnostics - 6.0L Bi-Fuel & CNG) >> Diagnostic Tests >> DTC P1432: Fuel Tank Pressure Sensor Signal Low >> Diagnostic Procedures

Diagnostic Procedures

WARNING: This page is about a different car, the 2003 GMC Savana and 2003 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
  1. Did you perform the Diagnostic System Check - Alternative Fuels - Engine Controls. If yes, go to next step. If no, see DIAGNOSTIC SYSTEM CHECK - ALTERNATIVE FUELS - ENGINE CONTROLS  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn ignition on, with engine off. Using a scan tool, observe the Fuel Tank Pressure (FTP) data parameter. Does the scan tool display a FTP sensor voltage less than 0.45 volt? If yes, go to step  4. if no, go to next step.
  3. Observe the Freeze Frame and/or the Failure records data for this DTC. Turn the ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions For Running The DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame and/or the Failure records data. If the DTC failed this ignition cycle, go to next step. If the DTC did not fail this ignition cycle, see INTERMITTENT CONDITIONS  under SELF-DIAGNOSTIC SYSTEM.
  4. Remove the fuel tank cover. Measure the voltage from the 5-volt reference circuit of the FTP sensor with a DVOM. If the voltage is more than 4.8 volts, go to next step. If the voltage is less than 4.8 volts, go to step  7.
  5. Connect a 3-amp fused jumper wire between the FTP sensor signal circuit and the FTP sensor 5-volt reference circuit. Using a scan tool, observe the FTP sensor data parameter. If the scan tool display the FTP sensor voltage is more than 4.7 volts, go to step  8. If the scan tool display is less than 4.7 volts, go to next step.
  6. Test for a short to ground or open on the FTP sensor signal circuit. Did you find and correct a short to ground or open? If yes, go to step  12. If no, go to step  9.
  7. Test for an open or a short to ground on the FTP sensor 5-volt reference circuit. Did you find and correct an open or a short to ground? If yes, go to step  12. If no, go to step  9.
  8. Test for an intermittent and/or a poor connection at the FTP sensor. Did you find and correct an intermittent and/or a poor connection? If yes, go to step  12. If no, go to step  10.
  9. Test for an intermittent and/or a poor connection at the PCM. Did you find and correct an intermittent and/or a poor connection? If yes, go to step  12. If no, go to step  11.
  10. Replace the FTP sensor. After replacement is complete, go to step  12.
  11. Replace the PCM. After replacement is complete, go to step  12.
  12. Using a scan tool, clear the DTCs. Turn ignition off for 30 seconds. Start the engine. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records. If the DTC failed this ignition cycle, go to step  2. If the DTC did not fail this ignition cycle, go to next step.
  13. Observe the Capture Info using a scan tool. Are there any DTCs that have not been diagnosed? If yes, see DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no, system is okay.
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