It always passed as there was 2 fail readiness tests allowed, now just one. Same for other GM vehicles I have smoged, the EGR is one readiness test that never seems to complete It has never shown ready IIRC over the years While the tech was not forthcoming as to the 'why' (Test Only stations here can not do repairs) I suspect EGR as one of them. The battery has been disconnected dozens of times over the years for various reasons and passed the computer test by smog.ĭon't know if the guy is beating me up for retest $ but if this driving cycle has to be achieved.I will either get tickets, run over someone or certainly blow through some stop signs & lights doing so So even though the car has passed smog every time, at the same shop for 15 years, and it has been about 3k miles since the last test with the only difference being a year ago battery was disconnected to replace.

Again, don't press the clutch or brakes or shift gears.Īgain.I don't own a private test track so being able to cold start and let idle with AC & rear defroster on for 2 1/2 minutes then accelerate to 55 mph for 3 minutes then decelerate NO BRAKES to 20 mph 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 55mph (88km/hr) for five minutes. This will perform the same diagnostics as in step 3. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). 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 20 mph (32km/hr). AND!!!!!Do not shift, touch the brake or clutch. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed. Hold a steady speed of 55mph (88km/hr) 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 55mph (88km/hr) 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 in 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 122☏ (50☌) and within 11☏ (6☌) of the ambient air temperature at startup. General Motors (specific) OBD II Drive Cycle I don't own a test track so finding enough road where you don't have to touch your brakes or maintain those speeds is next to impossible He said I needed to drive 45 mph for 15 minutes, stop for a few min then drive 55 mph for 15 min. I said a year ago and about 2500 miles since. Guy asked if the battery had recently been disconnected. I just failed the 'readiness' check for smog.

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