mack123

iTrader: (4)

hey all,

I was doing some votage tests the other day on my ecu, and the 5th gear switch one readingscame out backwards...

the fsm says 12v in 5th gear and below 1.5 in the others

I read thru some old posts here and a few other guys seemed to haev come up with the same readings as me.

Yet they say the N/A readings, in the fsm, give opposite readings. 12v in all others and 1.5 in 5th

I read where, I think it was hailers, mentioned the 5th gear switch turns on the switching solenoid,grounds it, and so the 5th gear switch is important..

If its backwards or if I have a bad one then Im getting the switching valve in the acv working all the time when it should work in 5th only or vise versa..

I wonder if anyone has the golden ticket on this one,
and knows which voltage version is right?

I cant see why turbo or n/a is different.
they both would need the acv air flow at 5th.. maybe I am wrong..

maybe its a typo error in the turbo fsm?
any help is appreciated

HAILERS

I must have mistyped in that post. When in fifth gear a ground is put on the Split Air solenoid. The Split Air solenoid is on the ACV. It's the rear most solenoid.

Here's a simple test. Remove the split air solenoid but leave its elec connector connected. The solenoid has a plunger and very small spring. When the car is in fifth gear the plunger is pulled in the solenoid. When not in fifth that plunger will fall out of the solenoid. So get a 17mm size wrench and remove the solenoid. Then turn the key to ON. Then go look at the solenoid. The plunger will just fall out of its hole in the solenoid. Now put the car in fifth. The plunger should be magneticaly held in the acv...proving the fifth gear sw is working.'

My apology if I wrote in the other post that the switching solenoid was effected by the fifth gear sw.

mack123

iTrader: (4)

no apology needed, I might have read your post and got it switched also. I have tested my solenoids and they all click and when I restored my acv 2 weeks ago I made sure it worked like new. although I had to replace a diaphram, it was ddried hard like a tortilla chip.

So youre saying the fsm is right or it is atypo arror and our cars are right. Like I said, my voltage reading came out backwards from the fsm.. just wondering.

I have done a lot of wok on my turbo lately. I know why they call it a turbo. open the hood and all my time and money gets sucked into a turbo black hole.. hah

Have you ever seen that little vac hose for the pressure regulator? it is under the manifold and in a place that is so weird. I dont know why they designed it like that.
It was bizzare. I put on a new hose last saturday.
thanks all

HAILERS

Frankly I decided that I could not make heads or tails about what the fifth gear switch should read.

I decided there was/is one positive way to ensure it is working right.

If the Split Air Solenoid engages when you put the car in fifth gear......alls well. If not.....it ain't all well.

The car does not need to be running to do this. Just the key to ON and engage/disengage fifth gear. Have someone do that while you touch/listen to the Split Air solenoid on the ACV.

Sorry, as you read in that other post.......I'm still confused about the output at the ECU..turbo vs non-turbo. On all my cars the Split Air Solenoid engages in fifth, positive proof that the fifth gear sw is working and the output from it is what it should be.

vaughnc

dejavu'

The diaphrams in my 89' rx-7 are not removable/replaceable from what I can tell, how were you able to remove yours?

I'm just finished a partial rebuild on my ACV right, and I'm now getting good vaccuum on both diaphrams. I'm planning on fixing the 3rd "permantenly sealed/inaccessbile" diaphram as well to help a bit with high RPM backfiring between shifts.

Check my post on this here:

https://www.rx7club.com/showthread.p...hreadid=310184

HAILERS

Look on Ebay for air control valves in the MAZDA RX-7 search area. They show up once and a while and come cheap.