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Author Topic: BMW OBD Readiness Monitor - Drive Cycle steps  (Read 20151 times)
dandrew007
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« on: May 27, 2010, 09:44:46 PM »

From E90 post.

1) Start cold engine and idle for approximately 2 minutes, 10 seconds. This checks secondary air injection and evaporative leak detection systems.

2) Accelerate to 20-30 MPH and maintain steady speed for 3 minutes, 15 seconds. This establishes closed loop oxy-sensor operations, response times & switching times.

3) Accelerate to 40-60 MPH and maintain steady speed for 15-20 minutes. This evaluates catalytic converters while oxy-sensor response and switching times are checked.

4) De-accelerate and come to a stop. Idle in gear for 5-6 minutes. This checks evaporative leak detection system.

Remember:
The diagnostic checks above will be discontinued if:
1) Engine speeds exceed 3000 RPM
2) Large fluctuations in throttle position
3) Road speeds exceed 60 MPH

Below is the PDF:

http://www.europeantransmissions.com/Bulletin/DTC.BMW/BMW%20FTP72%20Drive%20Cycle%20Procedure.pdf
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dandrew007
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« Reply #1 on: May 28, 2010, 12:20:59 PM »

Well I can attest that the readiness monitor drive cycle steps outlined here worked. I marginally followed them y. I didn't get quite to 15 minutes continuously at 60 mph (about 10 minutes) but I did drive from I-287 exit 4 to exit 12 and then turned around. I was convinced that the cycle was broken, but I took the chance.

I passed inspections, they do not give you the pass printout anymore so I waited until I returned to scan my monitors with my OBD II tool to see if in fact they were all READY. I was pleasantly surprised to see that at least 4 monitors that I've never seen READY now in fact were. Pics below:





* Photo0447.jpg (767.71 KB, 1600x1200 - viewed 733 times.)

* Photo0448.jpg (596.25 KB, 1600x1200 - viewed 438 times.)

* Photo0449.jpg (648.81 KB, 1600x1200 - viewed 463 times.)

* Photo0450.jpg (540.15 KB, 1600x1200 - viewed 459 times.)
« Last Edit: May 28, 2010, 12:22:54 PM by dandrew007 » Logged

dandrew007
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Posts: 147


« Reply #2 on: May 28, 2010, 12:24:33 PM »

Pics of the other Monitors 


* Photo0451.jpg (591.12 KB, 1600x1200 - viewed 453 times.)

* Photo0452.jpg (560.94 KB, 1600x1200 - viewed 426 times.)

* Photo0453.jpg (527.41 KB, 1600x1200 - viewed 384 times.)
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