AEM EMS 2 33-6620 the resistor R11 burned out

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Aliva
Posts: 2
Joined: Sat Sep 11, 2021 3:47 pm
Car: 1966 Nissan Skyline ECR33

AEM EMS 2 33-6620 the resistor R11 burned out

Postby Aliva » Sat Sep 11, 2021 11:30 pm

hi there)
I'm new here, but I hope that you can help me;)
I have a problem with ecu AEM EMS 2 30-6620: there was a problem with the wiring during the swap. the resistor R11 burned out in ecu.
it looks like this.
Image

unfortunately, it is not possible to determine its nominal value:(

if there are owners of the same ecu here, can you look what kind of resistor is there and make a foto?
Thnx in advance.


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VStar650CL
Posts: 2937
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: AEM EMS 2 33-6620 the resistor R11 burned out

Postby VStar650CL » Sun Sep 12, 2021 9:57 am

Looks like it melted the solder and cracked in half. Try desoldering those two pieces, flip them over and match them up to see if the numbers are readable. If so, determining the value is easy. The last number always indicates the number of zeroes, while the total number of digits determines the precision. For instance, the 4701 next to it is 470 plus one zero = 4700 ohms (4.7K), and 4 digits indicates 1~2% precision. The 684 diagonally down from it is 68 plus 4 zeroes = 680,000 ohms (680K), and 3 digits indicates 5~10% precision.

Aliva
Posts: 2
Joined: Sat Sep 11, 2021 3:47 pm
Car: 1966 Nissan Skyline ECR33

Re: AEM EMS 2 33-6620 the resistor R11 burned out

Postby Aliva » Tue Sep 14, 2021 11:52 pm

VStar650CL wrote:
Sun Sep 12, 2021 9:57 am
Looks like it melted the solder and cracked in half. Try desoldering those two pieces, flip them over and match them up to see if the numbers are readable. If so, determining the value is easy. The last number always indicates the number of zeroes, while the total number of digits determines the precision. For instance, the 4701 next to it is 470 plus one zero = 4700 ohms (4.7K), and 4 digits indicates 1~2% precision. The 684 diagonally down from it is 68 plus 4 zeroes = 680,000 ohms (680K), and 3 digits indicates 5~10% precision.
hello. thanks.
I looked at 2 pieces, but it's difficult.
the resistor exploded. photo under the microscope:
Image
Image

I think it's a 2R2 resistor at 2.2 ohms.

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VStar650CL
Posts: 2937
Joined: Thu Nov 12, 2020 1:25 pm
Car: 2013 Nissan Altima 2.5 SL
2004 Nissan Altima 2.5 S

Re: AEM EMS 2 33-6620 the resistor R11 burned out

Postby VStar650CL » Wed Sep 15, 2021 2:07 pm

Yep, that little tail on the righthand half doesn't correspond to any digit, so I'd say 2R2 is right. Judging by the SO chips on the board, it looks like the size is 0805 (inch). The highest common wattage on 0805's is 1/4W (1/2's are available but they're a specialty and pretty pricey), so if you go with that you should be safe. I'd get more than one in case something on the board shorted to cause it to blow.


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