Again, don't press the clutch or brakes or shift gears. This will perform the same diagnostics as in step 5. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.ĭecelerate. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. Hold a steady speed of 88km/hr (55mph) for five minutes. This will perform the same diagnostics as in step 3. Accelerate at 3/4 throttle until 88-96 km/hr (55-60mph). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.Īccelerate. Two EVAP systems have been used since 1998. The vehicle is hot soaked to simulate the car being run, parked and allowed to cool. The EPA tests these systems by putting a car in a sealed chamber. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). To understand how any EVAP system in a Honda or other vehicle works, you have to know how the EPA tests for evaporative emissions. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.ĭecelerate. It pressurizes the EVAP system, and once pressure is achieved, it watches for pressure loss. First, the vent valve and purge valves are closed, in order to seal the system at both ends. When the system checks itself for leaks, it does a few things. Hold a steady speed of 88km/hr (55mph) for 3 minutes. The leak detection pump pressurizes the system. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed. Turn off the air conditioner and all the other loads and apply half throttle until 88km/hr (55mph) is reached. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire and if closed loop is achieved, Fuel Trim.Īccelerate. The vehicle’s control module (PCM/ECM) runs various monitors (tests) that evaluate the EVAP system. The PCM has been updated to include a stay-alive microprocessor that’s designed to control the CVS and monitor the FTPS key-on, engine-off (KOEO) without energizing the entire PCM. The more electrical load you can apply the better. The system is called an engine off natural vacuum (EONV), and primarily uses the CVS and FTPS after the vehicle is shut off to check the gas vapor system. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. Do not leave the key on prior to the cold start or the heated oxygen sensor diagnostic may not run. In order to be classified as a cold start the engine coolant temperature must be below 50☌ (122☏) and within 6☌ (11☏) of the ambient air temperature at startup. To perform an OBDII Driving cycle do the following:Ĭold Start. A complete driving cycle can be done in under fifteen minutes. A complete driving cycle should perform diagnostics on all systems.
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