Stopping the back feed on a wire to the ECU
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- čas přidán 11. 06. 2021
- Adding a zener diode to trigger fans when ac kicks on and not trigger a check engine light from the back feed.
NTE Electronics 1N5404 Silicon Standard Recovery Rectifier Diode, 3 Amp, DO-201AD, 400V (Pack of 15) www.amazon.com/dp/B008UFXAKY/...
UAC SW 4082C A/C Trinary Switch www.amazon.com/dp/B003R3WY6A/... - Auta a dopravní prostředky
I’m wiring up a 6nz cat in my 74 kenworth. Doing ecm controlled fan for temp sensor. Using separate trinary switch for ac… I was thinking about this all damn day today and now I Find this and all my questions have been answered! Thank you
Thanks for watching and letting me know! Keeps me motivated to keep posting when I know it helped someone!! I'm glad you found my video and it helped.
great info. Thanks
Trying to wrap my head around this, if I have a 2002 411 ecu that provides ground to trigger fan relay coil, and I want to have another ground from ac trigger that same relay coil, if electricity is traveling from positive to negative, flowing into the ecu because it’s a ground trigger, how could the circuit ever become complete if you have one of these keeping electricity from flowing into the ecu
You would have a ground flowing from the ECU to the relay. The relay already has the main power and ground and is waiting for a ground trigger to connect the main power and ground. So when the ground from the ECU travels to the relay it allows the other two circuits to connect thus turning on the fan. Adding this keeps the second ground from back feeding to the ECU, when the ECU thinks it's off, and triggering a light because it sees a circuit that it's not demanding. This allows only a one way street for the flow of the current. Does this help? When the ECU demands something to be turned on it sees the ground connect. It will throw a light if it sees current when no current is being demanded. This stops the back flow. You can have as many triggers as you want going to one relay to activate it, but if it is monitored by an ECU the ECU will trigger a check engine light when it sees it's been activated (from the back flow) when it is not calling for it to be activated. This only stops the back feed to this one wire.