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Home >> Cadillac >> 2007 >> SRX 4.6 A, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.6L - DTC P0340 To DTC P2544 >> DTC P0446 >> Circuit/System Testing

Circuit/System Testing

IMPORTANT: Refer to the J 41413-200  operation manual for detailed instructions.
  1. Inspect the EVAP vent system for a restriction.
  2. Test the low reference circuit of the FTP sensor for an open or for high resistance.
  3. With the GE-41415-50  , connect the J 41413-200  to the fuel filler neck. See Special Tools .
  4. Start the engine.
  5. Allow the engine to idle.
  6. Use the Purge/Seal function to seal the system with a scan tool.
  7. Command the EVAP Canister purge solenoid valve to 20 percent.
  8. Observe the vacuum/pressure gage on the J 41413-200  and the FTP parameter on the scan tool.
  9. Verify that the vacuum increased to the abort limit on the scan tool or more than 3.2 volts, and the value is closely similar between the scan tool and the vacuum/pressure gage on the J 41413-200  .
    • If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.
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