Safc problem

JustAnotherVictim

JustAnotherVictim

Supramania Contributor
Mar 30, 2005
4,722
6
38
The master of speaking without saying anything.
Ok my friend and I tried hooking up the safc yesterday on my 87 7mgte and I can't get anything to show up on the display. We soldered everything except for the air flow readings which are on male/female connectors.

Everything shows that the safc is getting power but nothing shows up on the display. The car runs also although I had to d/c the airflow readings to make it run normal. I checked those connections and they look solid so I'm not sure what's going on with it.

Here's how I have it wired:


red - pwr
green - rpm
grey - throttle
blue - knock sensor
black - ground
brown - ground/closest to ecu on the one wire
pink - airflow/pressure sensor output
orange - airflow/pressure sensor input
 
robbo185

robbo185

New Member
Apr 6, 2005
693
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40
Chicago
did you buy the safc used?
and hook up all the wires to be safe...but i doubt that has anything to do with it
 
M

mixmastermatt

Former Nissan Junkie
Mar 30, 2006
124
0
0
Taftville, CT
When you say that nothing shows up on the display, do you mean that the entire display is blank, or that everything reads 0? If it is completly blank, completely disconnect it, and find a seperate source for power and ground and see if it will come on. If the start up screen comes on (where it displays SAFC for a few secs) but then blanks out, then the brightness setting is all the way down. Just do what you can to reinitialize it, which will be hard since you can't see it, lol. Could be a bad SAFC, too. Seen that quite a few times.
 
D

dbsupra90

toonar
Apr 1, 2005
2,374
0
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indiucky
i have seen the cable connection come loose inside the afc itself. if all else fails carefully remove the case screws and check that the cable is completely seated in the connector on the afc.
 
C

cnewingham

Guest
did you use the proper diagram? remember the 87 and 88 is different from the 89+
 
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dbsupra90

toonar
Apr 1, 2005
2,374
0
0
indiucky
JustAnotherVictim said:
Yes I did :)
Anyways just went out and checked and the connection to the harness from inside the safc came loose from the circuit board. So now it shows up when I turn the power on :icon_bigg
Thanks for that suggestion db
Click to expand...

sure thing!

glad that worked for you.
 
D

dbsupra90

toonar
Apr 1, 2005
2,374
0
0
indiucky
88-7mgte.jpg


be sure you have it on the Ks not Vc.
 
M

mixmastermatt

Former Nissan Junkie
Mar 30, 2006
124
0
0
Taftville, CT
JustAnotherVictim said:
It's wired correctly but I still can't get the car to start with it hooked up.
Everything else is still working though.
Click to expand...


You have the pink and orange on the same wire(Ks) correct? With the Ks signal wire cut, you should have the pink on the side going to the ECU and the orange on the side coming from the AFM. That is the only lead that must be cut, the rest you can just splice in without actually cutting them.
 
S

suprastanger507mgte

2x88+2x89+1x91+2x92=ME
Apr 5, 2005
3,148
6
38
Hayward , Ca
Also , remember, you need to setup the device first before starting the car .
That is so that you can configure the type of sensor you are using :
Follow the inital setup screen, sicne you bought it used, it may have been configured to another car.
 
S

suprastanger507mgte

2x88+2x89+1x91+2x92=ME
Apr 5, 2005
3,148
6
38
Hayward , Ca
JustAnotherVictim said:
So are you saying turn the ignition on then try to set it up with the engine off Moe? Because it was configured for and MKIV and all the setting seem to be correct. I chose Karman for the a/f readings so I'm not sure what's up still.
Click to expand...

Yup, set it up before starting the car, go through all the settings , start by initializing it first to dump all the old settings on it.
Make sure the throttle arrow is pointing up ( 1'clock position ) etc..
do you have thr grounds wired correctly??
 
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