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Old 11-18-2008, 02:37 PM  
xxxJohnBoyxxx
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Join Date: Dec 2007
Location: Gulfport, Florida
Posts: 3,208
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Default Air Pump Simulator DIY for $12.45

I have completed my final version of my air pump simulator and it passed the testing this morning with no error codes. All parts from Radio Shack and total cost $12.45. No more $150-$200 to buy these online. I will post the complete DIY this evening when I get home from work. Here's a picture of...
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  #90  
By covert24 on 09-15-2011, 06:57 PM
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I really wish I had the patience and knowledge to do stuff like this. I used to Be all into circuitry and electrical engineering when I was younger but I just get to frustrated too fast now (ie. My attempt at the sim haha). If you don't mind me asking what exactly will those be doing specifically? I see a spot for a microcontroller on those which leads me to believe your going to have to do some coding (not my favorite thing in the world).
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  #91  
By John Firestone on 09-15-2011, 08:55 PM
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Quote:
Originally Posted by covert24 View Post
... What exactly will those be doing specifically? I see a spot for a microcontroller on those which leads me to believe your going to have to do some coding (not my favorite thing in the world).
The PCB board provides some interface electronics to support pathway lighting and DRLs. The upper third of the board senses the turn stalk high beam flash contacts and detects when you pull the stalk with the ignition and parking lights off. The lower third replicates most of the logic inside the Canadian DRL module so that I can substitute the finned solid state relay. The 16 pin IC at the lower right, a 3-44V (yow!) CMOS multiplexer, provides the hardwired logic.

A small microcontroller near the board provides the timing and the fancy tricks you'd expect. I've set up a pleasant system to cross-develop its firmware, but that still leaves nailing down all the conceptual details and the hard labor of the installation work. I don't mind the detail work since I am the rate limiting step and not my tools. Some necessary bits of the install, however, I wouldn't mind skipping.
Last edited by John Firestone; 09-15-2011 at 09:18 PM..
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  #92  
By xxxJohnBoyxxx on 12-30-2011, 07:41 PM
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Is there anyone making these for people? I have a customer that wants one. Thanks, John S
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  #93  
By John Firestone on 12-30-2011, 08:11 PM
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Which bits, exactly, is the customer interested in?
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  #94  
By volgapower on 12-31-2011, 04:13 PM
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sorry whats the purpose of this device?
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  #95  
By xxxJohnBoyxxx on 12-31-2011, 05:26 PM
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Customer is looking for a single bank simulator for a I-4 complete unit ready to install
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  #96  
By xxxJohnBoyxxx on 12-31-2011, 05:27 PM
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Quote:
Originally Posted by volgapower View Post
sorry whats the purpose of this device?
It simulates the air pump so you can remove it and not get a CEL
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  #97  
By Mkl on 10-15-2012, 08:37 AM
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Hi,
Did anyone do it on a M43 engine?
I have complete my SAP simulator but I have no idea where the O2 and DME cables must go. The jack that goes into the SAP only have 2 wires. Should I look for other cables (the ones that goes from the O2 sensor to DME)?
Thanks
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  #98  
By John Firestone on 10-15-2012, 08:51 AM
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I didn't realize the M43 even had a secondary air pump or a second, downstream lambda sensor. I thought those were U.S. OBD-II additions. What month and year is your car?
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  #99  
By Mkl on 10-15-2012, 08:57 AM
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It's an 318i E46 BMW with M43TUB19 engine, from 10.1998.
It has a SAP, and 2 O2 sensors. I removed the SAP yesterday.
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  #100  
By John Firestone on 10-15-2012, 09:19 AM
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Ah, that explains it, you have a car built to satisfy the later EOBD, which in Germany reduced your taxes. Unfortunately, the wiring diagrams for the contemporary E36 compacts show they don't have it.

Have you checked the BMW WDS? It's not as comprehensive but might show the wiring.
Last edited by John Firestone; 10-15-2012 at 09:22 AM..
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  #101  
By Mkl on 10-15-2012, 09:35 AM
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I have found a BMW WDS that might help. Both O2 and DME from SAP simulator should connect to O2 wiring?
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  #102  
By John Firestone on 10-15-2012, 09:50 AM
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I believe so, but I have no experience. If I were doing it, I would consult a later, U.S. E36 BMW ETM, see how people are wiring the simulator into an American car and then translate the connections to yours with the help of the WDS.
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  #103  
By Mkl on 10-15-2012, 11:55 AM
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I guess all the O2 sensors are 4 wired. 2 for power supply, 1 for ground and 1 for DME. From my understanding the emulator O2 and DME come together with the O2 DME wire. Is that right?
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  #104  
By xxxJohnBoyxxx on 10-15-2012, 01:03 PM
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Quote:
Originally Posted by Mkl View Post
I guess all the O2 sensors are 4 wired. 2 for power supply, 1 for ground and 1 for DME. From my understanding the emulator O2 and DME come together with the O2 DME wire. Is that right?
That is correct. The simulator is a pass-through devise unless active so it passes the exact O2 reading to the DME when in the off position. When it is active it removes the O2 signal to the DME and sends a lean condition signal which is what the DME looks for to check air pump operation.

The air pump injects air in the exhaust so to simulate the air pump you just create a lean condition reading from the O2 and the DME thinks it has the air pump working correctly adding additional fresh air to the exhaust to help heat up the cat converter quicker.

The simulator is only on for 30 seconds to 1 minute when you cold start the car then the DME switches it off and it's like the simulator was not even installed on the car.

Hope this helps, John S
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