EVAPORATIVE SYSTEM MONITOR DRIVE CYCLE

The evaporative emission (EVAP) control system limits the fuel vapors from escaping into the atmosphere. Fuel vapors from the fuel tank are stored in an activated carbon storage device, when the engine is able to use the extra fuel vapor, the intake air flow purges it into the engine as part of the normal combustion process.

  • Ensure that fuel filler cap is fully closed (minimum three clicks).
  • Fuel level is greater than 30% and less than 85%. full
  • Perform ECM DTC Clear (even if no DTCs are flagged).
  • Drive vehicle for a minimum of 2 minutes, and until engine is at normal operating temperature.
  • Using an OBDII analyser, ensure that the EVAP Canister Purge Valve is operating by observing “PURGE VAPOR MANAGEMENT VALVE – DUTY CYCLE”. If the valve is not active, ECM adaptions have not been learned. Conduct a “green ECM” Drive Cycle.
  • Drive vehicle to the road where the EVAP System Drive Cycle will be conducted. Stop vehicle and switch OFF the ignition. Leave ignition OFF for 30 seconds,then restart the engine.
  • Accelerate briskly to 80 km/h (50 mph) ensuring that the engine speed reaches a minimum of 3500 rpm for a minimum of 5 seconds.
  • (0.040 inch EVAP Test) Avoiding high engine loads, drive the vehicle steadily between 65 km/h (40 mph) and 100 km/h (60 mph). Avoid driving conditions that will produce excessive fuel movement. The OBDII analyser should give an indication that the test is active (it may take up to 30 minutes before the test will initialize). When the test has initialized (EVAP Canister Close Valve CLOSED), it will take approximately 90 seconds for the test to complete.
  • (0.020 inch EVAP Test) Continue driving vehicle as explained in Step 8 for an additional 10 minutes.
  • Gently coast the vehicle to a stop. Allow the engine to idle for 2 minutes. An OBDII analyser should give an indication that the test is active. When the test has initialized (EVAP Canister Close Valve CLOSED), it will take approximately 90 seconds for the test to complete.
  • If the 0.020 inch EVAP Test is not activated, the purge system vapor concentration may be too great. To reduce the vapor concentration proceed as follows:
  • Drive the vehicle for an additional 30 minutes avoiding driving conditions that will produce excessive fuel movement. Repeat Step 10. If the 0.020 inch EVAP Test is still not activated, repeat the Drive Cycle from Step 6.
  • Check for and clear flagged DTCs.

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