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Home >> Saturn >> 2001 >> LW200 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0442: EVAP System - Small Leak Detected >> Diagnostic Procedures
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Diagnostic Procedures

NOTE: If DTC P0461, P0462, P0463 or P1640 is set, diagnose affected DTCs first and retest system. See DTC P0461: FUEL LEVEL SENSOR CIRCUIT PERFORMANCE , DTC P0462: FUEL LEVEL SENSOR CIRCUIT - LOW VOLTAGE , DTC P0463: FUEL LEVEL SENSOR CIRCUIT - HIGH VOLTAGE , DTC 1640: EVAP PURGE SOLENOID CONTROL CIRCUIT LOW VOLTAGE , DTC 1640: EVAP PURGE SOLENOID CONTROL CIRCUIT HIGH VOLTAGE , DTC 1640: EVAP VENT SOLENOID CONTROL CIRCUIT LOW VOLTAGE  or DTC 1640: EVAP VENT SOLENOID CONTROL CIRCUIT HIGH VOLTAGE  .
  1. Turn ignition on, engine off. Remove fuel cap. Using scan tool, monitor FUEL TANK PRESS. SENSOR. If voltage is 2.35-2.85 volts, go to step  3. If voltage is not 2.35-2.85 volts, go to next step.
  2. If voltage is less than 0.10 volt, see DTC P0452: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE . If voltage is 0.10-2.35 volts or 2.85-4.90 volts, replace fuel tank pressure sensor. If voltage is more than 4.90 volts, see DTC P0453: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE .
  3. Install fuel cap. Using scan tool, perform EVAP SYSTEM SEAL special functions. Connect EVAP Pressure/Purge Cart (J 41413) to EVAP service port. Pressurize system to 8 in. H2O, then switch to HOLD position. Use ultrasonic leak detector to locate small leaks. After repairs, retest system.
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