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Thread Title:

ddec 3 ecm (problem on diode)


Created On Monday May 25, 2015 02:50 Diesel Talk
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marben
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Note Monday May 25, 2015 02:50 View thread in raw text format
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Good Day Everyone ..

I hope someone could help me. I have a ddec 3 ecm which diode (at the power section-there are two diodes) on the right side when facing the board that was detached. I would like to change the two diodes since the other one (left diode) also do not register any resistance on the tester. My questions are as follows:

1. Which diode (when facing the board) is for the positive ground (left or right?) and which diode is for the negative ground (left or right?)?
2. What is the resistance of the left diode and of the right diode?

While above are my concerns at the moment, I will appreciate if someone can share a copy of the ddec 3 circuit board diagram.

Thanks in advance.
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westcoast
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Note Monday May 25, 2015 06:17 View users profile View thread in raw text format
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Rings determine polarity ,self explanetary Regards David

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detroit
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egantrucking
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Note Monday May 25, 2015 06:21 View thread in raw text format
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Maybe you already know this, but most of the time a diode must be taken out of a circuit to be tested properly. It should show an open circuit one way and some resistance when you reverse your test probes. Most all parts have numbers on them that can be cross referenced. Or if there are two of the same diodes in there, compare the readings to each other.

I have never worked on that model ecm. Just my 2 cents. Good luck!

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michael egan
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marben
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Note Monday May 25, 2015 07:23 View thread in raw text format
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Thanks David, got your point. Since the right diode was already detached when opened the box, i am not sure if the two diodes had the ring side on the same direction or opposite.
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marben
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Note Monday May 25, 2015 07:28 View thread in raw text format
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Thank you egan for your guide, it's more than 2 cents. Meantime, i would like to know the standard specification of resistance on the two diodes (for this ddec 3 ecm) to identify if the two diodes are still within specification or already due for replacement.
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marben
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Note Monday May 25, 2015 07:33 View thread in raw text format
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Egan, i forgot to say that the numbers on diode is not clear anymore and is difficult to recognize..
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westcoast
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Note Thursday May 28, 2015 07:43 View users profile View thread in raw text format
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I,ll send ring colours tomorrow Regards David

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detroit
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marben
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Note Saturday May 30, 2015 06:49 View thread in raw text format
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Thank you David...

By the way, before we removed the ecm, when we tried to switch the ignition on, only 3 red ligths on and yellows are out. Are they supposed to be on all reds and yellows and will turn off once the engine started (assuming no faults)? Is it related only to the detached diode or there is still something else?
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