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Home >> Saturn >> 2002 >> L300 >> 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 P0440, P0442, P0446 or P0455 is set, EVAP special functions on scan tool will not be allowed. Clear DTCs before performing these tests.
  1. Turn ignition on, engine off. Remove fuel cap. Using scan tool, monitor FTP SENSOR. If voltage is 2.35-2.85 volts, go to next step. If voltage is less than 0.2 volt, see DTC P0452: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - LOW VOLTAGE  . If voltage is 0.2-2.35 volts or 2.85-4.9 volts, replace FTP sensor. If voltage is more than 4.9 volts, see DTC P0453: EVAP FUEL TANK PRESSURE SENSOR CIRCUIT - HIGH VOLTAGE  .
  2. Install fuel cap. Clear ECM DTCs. Using scan tool, seal EVAP system by using EVAP PURGE/SEAL special function. Connect EVAP pressure/purge diagnostic cart J41750-SAT to EVAP service port. Pressurize system to 30 in. H2O, then switch to HOLD position. Use ultrasonic leak detector to locate the small leak.
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