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Home >> GMC >> 2018 >> Terrain Denali, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 7 (Engine Controls And Fuel - 1.5L (LYX) - Diagnostic Information And Procedures (P0351 - P26C8) And Symptoms) >> 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 variant/trim than selected.
NOTE:
  • Refer to the GE-41413-A  operation manual for detailed instructions in Evaporative Emission Control 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 or System Seal 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 service port until the leak is located using the GE-41413-SPT  .
      • If leak is detected, repair or replace the affected component as necessary.
    • Go to next step: If no leak is detected 
  5. All OK.
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