Hello all I ordered my ebl flash recently just waiting on Ups. And I was wondering how to disable the air system with out popping the pins out of the ECM. I had a ECM already installed to the ebl flash so I don't want to do that. The AIR pipes are still there (smog pump and all) but not Connected to the exhaust. I do not have the original cat either I have a hi-flow cat. Thanks for help all

Un-plug the electrical connector(s) at the pump valves.

The brown wire should be going to pin C2 at the ECM. Can use that to control the electric fan. Wire it to the same wire that is on the head temperature switch (between 6 & 8).

Note that you don't pop the pins out of the ECM, but out of the harness connectors.

RBob.

And where are the pump valves? And the pump valves connectors , sorry I am a noob with electrical! And if I do wire that wire to the switch on the head how does it work? (why connect that wire to the switch? And how does it work) my fan is routed to power all times right now (waiting on new head switch)

The 2 connectors to disconnect are on top of the AIR pump, under the "square" shaped plastic cover.

Can control, fan on-off themperature with EBL, try connecting it to the wire that plugs on the fan switch. Never tryed it, but should work. Set on-off settings in the bin, for exemple on at 190 and off at 180.

And I'm sorry to ask so many questions but since my fan is running all the time right now and I believe I read sme where that the CTS min-max needs to be what your engine runs for a good VE learn to take place is it ok for that value to be a big number in between say 140-185?And that value (140-185 for me) is regular engine temp when the engine is warmed up correct? Thanks for your help.

To not create confusion, the fan switch and the CTS are 2 different sensors and are not related.

As long as normal operation themperature is reached, there will not be huge differences in the VE tables, between cooler and hotter side of operational themp.

The fan running all the time, mainly keeps the underhood air themp low, the thermostat will only open at around 195°, allowing the wather to be cooled in the radiator and after that cool the engine.

Yes I know they are diff. CTS on intake fan switch on head. So what your saying is it doesn't matter what those variables are jus leave them be even though my engine doesn't run between those?

Made me courious, at what themperatures is your engine running in closed loop?

As we are talking about the FAN control can you confirm the signal that the ECM PIN 2 provides ?

I am currently installing a relay for the electric fan and I thought the signal from PIN C2 to control the fan would be a +12 V
(I use the air pump circuit PIN C1 moved to C2 because on the Caprice/Roadmaster it can be moved that way)

However I have a small doubt now I have read the EBL flasher manual again and would like to be sure of how to operate my relay.

If the ECM PIN C2 indeed provides a LOW (mean GROUND) signal then my relay coil must be connected as follows:
- one contact to the PIN C2
- second contact to a +12
(then the two other pins are the one used to power the high current to the fan).

Is that correct ???

additional query, do the Air Conditioning ON has an effect on the ECM logic to power the fan ON ??

Correct that the ECM provides a ground to turn on the relay. There are wiring diagrams on our web site under the Information drop down tab.

The fan is used in conjunction with the A/C.

Note that if your OEM ECM was the '6965, then the A/C relay enable wire needs to be moved. And an option flag needs to be set.

"The ECM harness pin C2 needs to be moved to location A2. And the A/CHi bit in Option Word 3 needs to be set."

RBob.

Yes mine was '6965
I have already relocated the A/C at first installation of the EBL.

now I am good for wiring correctly the electric fan