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Old 08-05-2009, 05:33 PM   #1
kilowhisky
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Default Failsafe resistor for BCS.

What is the resistor needed for the failsafe in a aquamist/aem water/meh injection kit? From what i read if you tap into the ecu -> BCS line that it will throw a code when the failsafe engages. People say to use a resistor to stop this from happening but i can't find what resistor i need to use. Does anyone know off hand?

I'm still looking through threads but i wanted to post this quick because i need the answer in the next few hours.
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Old 08-05-2009, 05:35 PM   #2
richy_21
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hmmmm also curious.
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Old 08-05-2009, 05:38 PM   #3
kilowhisky
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This it?

39R resistor/ 3W 39R resistor

Maybe i should leave it out and just use the CEL as an extra warning light.

EDIT: Ah ha! Found this quote by Aquamist.

Quote:
Originally Posted by Aquamist View Post
yes, the 39ohm resistor is needed. It should come with the DDS3 gauge. Once we have the DDS3 working as intended, We can then look into the CEL more closely.

Last edited by kilowhisky; 08-05-2009 at 05:55 PM.
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Old 08-05-2009, 06:48 PM   #4
elky82
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39 ohm 25 watt resistor is what you need
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Old 08-05-2009, 06:50 PM   #5
elky82
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and dont waste your time at radioshack, they dont have it -- you have to go to an electronics supply place
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Old 08-05-2009, 07:30 PM   #6
Aquamist
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The DDS3 should have one soldered on board already.
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Old 09-22-2012, 10:13 AM   #7
jsudler
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Bumping this for some guidance on how to wire the resistor to prevent a CEL.
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Old 09-24-2012, 02:50 AM   #8
Aquamist
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what system do you have?
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Old 09-24-2012, 05:37 PM   #9
jsudler
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Thanks for the reply, I have a labonte kit. the failsafe is wired to trigger a NC relay and switch my prodrive EBCS to wastegate pressure.

Last edited by jsudler; 09-24-2012 at 08:55 PM.
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Old 09-24-2012, 06:19 PM   #10
Aquamist
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After cutting the pulsed wire of the EBCV from the ECU

1. ECU side to the relay "com"
2. EBCV to the relay "NC"
3. 39ohm (10W* to 25W) to the relay "NO" (the other side of the 39ohm to 12V** (switched).

* 10W for short cut-off duration (less than 1 minute).
** you can use the non-pulsed side of the EBCV. (it is normally a switched 12V)
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