This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim. The more electrical load you can apply the better. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. In order to be classified as a cold start the engine coolant temperature must be below 122☏ (50☌) and within 11☏ (6☌) of the ambient air temperature at startup.ĭo not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run. General Motors (specific) OBD II Drive Cycle Allow the engine to idle for 10 seconds, turn the key off, and wait one minute. Decelerate with using the brake by coasting down to 20 MPH or less, then stop the vehicle.Restart and accelerate to 40-55 MPH at 25% throttle and maintain speed for two minutes.Decelerate without using the brake (coast down) to 20 MPH or less, then stop the vehicle.Accelerate to 40-55 MPH at 25% throttle and maintain speed for five minutes.Start cold (below 86☏ /30☌) and warm up until engine coolant temperature is at least 160° F (typically requires at least one minute up to 3 minutes).Ensure that the fuel tank is between 1/4 and 3/4 full.( Note: Drive cycle specifics vary by vehicle!) The following drive cycle will (theoretically) allow all monitors to run on (?) vehicle. However, to satisy all of the different Trip enable criteria and run all of the OBD II diagnostic monitors, the vehicle must be driven under a variety of conditions. Most OBD II ("On-Board Diagnostics II") diagnostic monitors will run at some time during normal operation of the vehicle. OBD II Drive Cycle (reset car diagnostic monitors ) Generic OBD II "Drive Cycle"
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