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***** Car Wont Start After Playing With Afm ******

thirtythree-II

By thirtythree-II,
in General Maintenance

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thirtythree-II Collaborator

thirtythree-II

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Posted (edited)

I was testing the volatge coming from my AFM on my r33 gtst s2 to see if its operating correctly by connecting a multi-meter to 2 of the 3 terminals, negative and positive. I incorrectly tried connecting it another way through the meter which caused the car to have a rough idle and then shutoff. Now it will not start at all. It cranks over and idles for a split second then shuts off. Ive checked all fuses that I know of and none are gone. Ive also reset the computer and this has achieved nothing. The care starts with the AFM disconnected but it has a rough idle. Any assistance would be greatly appreciated. Cheers.

Edited by thirtythree-II
GeeTR Grand Master

GeeTR

Posted
Posted

Ouch :)

Sounds like you killed it. If it starts fine with no AFM (prolly in limp mode though) and not at all with it connected, you most likely have killed the AFM :(

Multimeter on the signal and ground wires should give you a reading (don't quote me on that lol) that reading is whats confusing the ECU, causing it to not start. Maybe its outputting 5v, and the ECU doesn't like it.

Maybe checking for error codes and testing with known good AFM gets my tick too.

GeeTR Grand Master

GeeTR

Posted
Posted

The small voltages that are going on there (+5 volts) wont damage the loom wire.

A small arc when you were testing "could have though, damaged the AFM.

- I guess you could run 4 new test wires from ECU to AFM (just out the side of the bonnet, through the window) to test the loom.

- Borrow an AFM to test the AFM

thirtythree-II Collaborator

thirtythree-II

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I done a diagnostic test and it reported but no.12 afm problem.

I found power coming from the afm connector.

I will test the continuity of the afm signal sensor wire (no.27) and also the earth wire (no.26)

Are r33 s1 and s2 ECU identical with terminal pin connector layout????

thirtythree-II Collaborator

thirtythree-II

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there's continuity from both terminals no.26 & 27 to the AFM connector.

so it must be the AFM.... perhaps the AFM I tried form the wrecker was stuffed too.

I need to get my hands on a known working r33 s2 AFM.

thirtythree-II Collaborator

thirtythree-II

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  • Author
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tryed yet another AFM and car still didnt work.

It must be the ECU??????????

but why did the diagnostice test read no.12 afm errror.

is is the processor within the ECU for the AFM thats fried?????

anyone got a ECU for sale?

thirtythree-II Collaborator

thirtythree-II

Posted
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cheers for your help guys but 'buck' sorted me out.

i've got a happy 33 again.

I replaced the ecu and it started first thing.

what confuses me is that the diagnostic error code was no. 12 which is AFM error, but it was in fact the ECU????

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