atl1234

so I've swapped a ls1 into a rx7. and just hooked up the dual fans, and wanted to get some feedback from the community to get your opinion with what I've done.

i used this diagram to hook up my relays:


Then i used this sight to identify my cpm:
http://www.chevythunder.com/LS1%20co...Identification

Then i used this website to figure out the right pin to choose on the pcm:
http://mrk-motorsports.com/pdf/99-02...%20Pinouts.pdf

ok so this is whats happening after i hooked everything up.

only one fan turns on
and the fan doesn't turn off

any idea guys?

atl1234

oh and I'm running power straight from the battery with inline fuses

atl1234

just checked my engine codes and am receiving code p1480

P1480 Cooling Fan 1 Control Circuit High

where should i look to fix this?

atl1234

now i just found this diagram for the 3relays 2 fan setup.



now the only difference i can see between this diagram and the previous one that i posted is where relay 3 grounds to relay 2.

any thoughts out there in ls land?

JoeNova

That looks complicated for some reason lol.

Are you running them multiple speeds/modes?
It would be incredibly simple to wire the fans to both come on together full speed. One relay, one fuse.

atl1234

yes I'm running two modes, high speed and low speed fan.

I'm using blue connector pin 42 for the low speed(primary)

and

red connector pin 33 for high speed.

i was going to run it with one relay at full speed, but i kept reading reviews about how annoying it was to have the fans cutting on and off all the time, thats why gm had two speeds in there pcm.

JoeNova

To each his own. I run mine full speed on a single relay. Can't even hear them run. Wiring was insanely simple.

atl1234

do you have a diagram, i may just do that so i can drive the car

atl1234

while running the one relay system, can you have this setup on a car with air conditioning ?

L92 OLDS

Your 3 relay schematic is correct and shows a nice way to run both fans in series for less noise on the low setting. It assumes that both pin 33 and 42 go low for high speed fan operation. Have you tested this output from the ECM? The ECM should pull in both fans with AC request.

For simplicity sake I would use a 2 relay set up. Low speed would operate 1 fan at full speed, high speed both relays pull in at full voltage. As noted, they aren't that noisy.

atl1234

which schematic is correct?

I've posted two of them that are very similar but the grounding points on relay 3 and relay 2 are different

and no i didnt test the output from the pcm. Which should be a ground output, correct?

slogo

Your first Diagram looks good except
splice 167 to B10 instead of B9
and splice 113 to B9 instead of B10

atl1234

needs some clarification on what your saying because I'm confused.

are you saying i need to use the black and white diagram or the colored diagram?

and why should s167 and s113 be the way that you suggest?

Exidous

iTrader: (11)

Which fan is not turning off? More than likely there is just a mix up with the NO/NC poles of the relay.

Your setup should always have two fans running assuming the PCM wants the fan on. It just changes them from series(low) to parallel(high). Both diagrams look right except relay 3 on the first one. The NO/NC position seems wrong. The second diagram is correct.

I use something similar in my RX. I'm running a dual speed single Taurus fan though.

slogo

Use 1st diagram, I'm on phone now so can't
remember what splice numbers are.
But swap B9 and B10 around on relay.
1 wire is pink and other is black on your
diagram. Just swap those 2 around, or not.
Looks to me like you are pulling ground from
wrong side of other fan. Just my .02

atl1234

What your suggesting is the black and white diagram that I have posted. Correct?

The same thing that screenname exidous is suggesting.

slogo

Ok, look at only your very first post, you have a diagram there, in the middle of that diagram
you have a relay labeled cooling fan 3 relay , take the pink wire off of B10, take a picture of it so you know where it come off of, now take black wire off of B9, again take a picture
so you know where it came off of, now put pink wire on B9, and put black wire on B10.

I am NOT referring to post #4.

atl1234

::::update::::

Applied this modification to the harness, and now this is whats happening

fans do not turn on at all.

HalfSpec

iTrader: (3)

The only way you're going to solve this is to do some hands-on systematic troubleshooting to discover your wiring fault(s):

Pro tip before starting - Label your relays Relay 1, Relay 2, and Relay 3 according to the wiring diagram (your first post) and what your physical relays represent. Even if its just a sticky note. Get it all straight and stick to the same annotation while you troubleshoot.

You'll need a multimeter than can measure DC voltage and continuity:

Remove all three relays so you're only dealing with the sockets

DC Voltage tests:
1. Confirm 12V between the socket for pin 85 and the negative battery terminal on all 3 relay sockets
2. Confirm 12v between the socket for pin 30 and the negative battery terminal on relay sockets 1 and 2

Continuity tests:
1. Confirm continuity with the end of the dark green wire and the socket for pin 86 for relay 1
2. Confirm continuity with the end of the dark blue wire and the socket for pin 86 for relay 2 AND relay 3.
3. Confirm continuity between the socket for pin 87 for relay 1 and side B of the left cooling fan connector
4. Confirm continuity between side A of the left cooling fan connector and side B of the right cooling fan connector AND the socket for pin 87 for relay #2.
5. Confirm continuity between the socket for pin 87 for relay #3 and Negative Battery Terminal
6. Confirm continuity between side A of the right cooling connector and Negative Battery Terminal.

Do the steps in order and use the negative battery terminal for your connection when I specify to. Verifying at the negative battery terminal will ensure you're circuit is making a good connection to the chassis ground. If it doesn't make it all the way back to the battery, it's a crap ground and testing it my way will reveal the problem

Post results

Lane

atl1234

passed all voltage test,

failed continuity test on #4 and #6