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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Engine Controls And Fuel - 6.0L (L96) - DTC P0351 To DTC P2636 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0442: Evaporative Emission (EVAP) System Small Leak Detected >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Refer to the GE 41413-A  operation manual for detailed instructions in Evaporative Emission System Diagnosis 
  • Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize or produce smoke from a leak.
  • Ensure that the underbody temperature of the vehicle and the tester are similar.
  1. Disconnect the purge tube at the quick connector on the EVAP canister side of the Q12 Evaporative Emission Canister Purge Solenoid Valve and install the CH 48096  .
  2. Connect the GE 41413-A  to the CH 48096  .
  3. Command the EVAP Purge/Seal function to Not Venting with a scan tool to seal the EVAP system.
  4. Use the flow meter on the GE 41413-A  , calibrated to 0.51 mm (0.020 in) to determine if there is a leak.
    • If a leak is detected 
    1. Use the GE 41413-A  to apply smoke to the EVAP system at the purge tube until the leak is located using the GE 41413-SPT 
    • Go to next step: No leak in the EVAP system 
  5. All OK.
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