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Diagnostic Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2001 Saturn SW2, 2001 Saturn SL2, 2001 Saturn SL1, 2001 Saturn SL, and 2001 Saturn SC2. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: If DTCs P0444, P0445, P0447 or P0448 are also set, diagnose these DTCs first. See DTC P0444: EVAP PURGE VALVE CONTROL CIRCUIT OPEN , DTC P0445: EVAP PURGE VALVE CONTROL CIRCUIT SHORTED , DTC P0447: EVAP VENT VALVE CONTROL CIRCUIT OPEN  or DTC P0448: EVAP VENT VALVE CONTROL CIRCUIT SHORTED  .
  1. Turn ignition on, engine off. Remove fuel cap. Using scan tool, monitor FUEL TANK PRESS. SENSOR. If voltage is 1.3-1.7 volts, go to next step. If voltage is less than 0.1 volt, see DTC P0452: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE . If voltage is 0.1-1.3 volts or 1.7-4.9 volts, replace fuel tank pressure sensor. If voltage is greater than 4.9 volts, see DTC P0453: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE .
  2. Install fuel cap. Using scan tool, perform EVAP SYSTEM SEAL. Connect EVAP Pressure/Purge Diagnostic Cart (J 41750-SAT) to EVAP service port. Pressurize system to 8 in. H2O, then switch to hold position. Use ultrasonic leak detector to locate small leaks. See DIAGNOSTIC AIDS .
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