That said, yes, you can complete the steps separately as long as all other pre-requisites for completing the monitor have been met. The Bureau of Automotive Repair recognizes that competing the EVAP monitor can be difficult, so your 2003 Silverado will pass the OBD II portion of the smog inspection with an incomplete EVAP monitor if the “Check Engine” (MIL, Service Engine…, etc) is not commanded on, and all other monitors are complete. 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. 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. It is important to let the vehicle coast along gradually slowing down to 32km/hr (20 mph). During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed. Hold a steady speed of 88km/hr (55mph) for 3 minutes. 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. 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. 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: A complete driving cycle can be done in under fifteen minutes. If the rear should drop, I think the lack of vehicle momentum in combination with my amazing ninja-like reflexes, should be enough to prevent me from launching myself into the empty house across the street.The following is the recommended driving cycle for General Motors.Ī complete driving cycle should perform diagnostics on all systems. So that basically leaves me sitting there with as much clearance as possible in front of me while I "drive". My thoughts are that anything I could put in front of the front tires as a wheel chalk will have little stopping effect should the rear drop. I've never run a truck while on jack-stands and certainly never run one at 45 mph for 5 minutes then at 25 mph for 15. My questions are, will this work, and are there any specific issues (safety or otherwise) that I need to be aware of? So my new idea is to put the rear end up on jack-stands and "drive" the exact pattern that the FSM calls for.ĭon't know why I didn't think of this two weeks ago. It is simply damn near impossible to do where I live, and I'm tired of screwing with it. After two weeks of trying to meet the "readiness drive pattern" for the evap system so the truck will preform the pressure/vac test.I give up.
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