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Old April 1st, 2006, 10:32 AM   #1
CatalogGuy
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Join Date: Dec 2003
Location: Walnut Creek, CA
Posts: 310
Codes!

Thanks to Loren's recommendation (Renntech) I purchased the software and USB cable from www.durametric.com. It immediately showed me a list of codes from the motronic. Here is a link the pdf file I created to show the codes. Any help guessing why the car won't run. BTW O2 sensors are all new. I do have a new MAF in storage (old style which is what I have now) I can get here in a few weeks.

http://www.catalogguy.com/ecu20060401.pdf
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File Type: pdf ecu20060401.pdf (6.1 KB, 61 views)
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Old April 3rd, 2006, 08:44 AM   #2
CatalogGuy
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Join Date: Dec 2003
Location: Walnut Creek, CA
Posts: 310
Update and more info attempting to diagnose.....

2000 S that starts but does not run. Pcodes posted separately.

We spent some time last night looking for and not finding a disconnected or severed cable. Here are some notes on what we did and at the end is a list of 4 possible causes we have identified based on information so far.

-Pedal cable intact and moving the arm of the potentiometer

-Wires from potentiometer to connector seem ok and connections on both sides of connector for potentiometer wires seem ok.

-Wires from mass air flow sensor seem well connected.

-Wires to throttle position sensor seem connected.

-Wires to ECM seem connected.

-When throttle butterfly valve was slightly opened, the idle speed increased significantly but was surging more and engine died from fuel starvation, i.e. extremely lean mixture when throttle valve pushed open more than a few degrees, probably because air flow sensor not reading need for more fuel.

-When fuel pump relay was unplugged, engine ran for less than a minute. Engine restarted and idled when fuel pump relay was reinstalled.

1. ECM
2. Mass air flow sensor not working
3. Throttle position sensor?
4. Potentiometer to which pedal attaches









http://www.catalogguy.com/ecu20060401.pdf[/QUOTE]
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Old April 27th, 2006, 10:06 AM   #3
CatalogGuy
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Join Date: Dec 2003
Location: Walnut Creek, CA
Posts: 310
I now have a new MAF sensor in Mexico

As soon as I find a T20 bit I will swap it for the original and see what happens. I also have name and number of a P tech who worked on the car. After exploring these possibilities if no fix, I will have to find a trailer to tow it to CA







Quote:
Originally Posted by CatalogGuy
2000 S that starts but does not run. Pcodes posted separately.

We spent some time last night looking for and not finding a disconnected or severed cable. Here are some notes on what we did and at the end is a list of 4 possible causes we have identified based on information so far.

-Pedal cable intact and moving the arm of the potentiometer

-Wires from potentiometer to connector seem ok and connections on both sides of connector for potentiometer wires seem ok.

-Wires from mass air flow sensor seem well connected.

-Wires to throttle position sensor seem connected.

-Wires to ECM seem connected.

-When throttle butterfly valve was slightly opened, the idle speed increased significantly but was surging more and engine died from fuel starvation, i.e. extremely lean mixture when throttle valve pushed open more than a few degrees, probably because air flow sensor not reading need for more fuel.

-When fuel pump relay was unplugged, engine ran for less than a minute. Engine restarted and idled when fuel pump relay was reinstalled.

1. ECM
2. Mass air flow sensor not working
3. Throttle position sensor?
4. Potentiometer to which pedal attaches









http://www.catalogguy.com/ecu20060401.pdf
[/QUOTE]

Last edited by CatalogGuy; April 27th, 2006 at 10:07 AM. Reason: MAG <> MAF
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