check engine light code 24 & 31. with video - Toyota Nation Forum : Toyota Car and Truck Forums

89 soupda · 09-12-2011, 12:28 AM

ive been messin with this car for two days, tried another used maf and nothing. doesnt even change when unplugged. if anyone has any ideas thatd be great, thanks in advanced!

ive checked and found all vacuum leaks no boost leaks no intake leaks.

1989 supra 5spd trans

http://s136.photobucket.com/albums/q...MDU5LjNncA.mp4

the video is holding the throttle about 1/4 down. any more and it just floods like crazy and backfires and pops out of the intake.

89 soupda · 09-12-2011, 06:21 PM

. I tore apart the harness and looked for bad wires and didn't find jack.
I added a new ground from head to the body just incase, i reset the battery and started it a few times to get it to idel, I noticed that it won't rev up at all until the engine light comes on. After the light comes on it does what is in the first vid. I'm posting a second one of what it does till the light kicks on.

89 soupda · 09-12-2011, 07:11 PM

http://i136.photobucket.com/albums/q.../VIDEO0063.mp4

***bgrieger*** · 09-12-2011, 07:44 PM

The codes posted are both AFM related. 31 is open or short circuit, 24 is air temp sensor.. Check your PM as the description would take longer than the picture...

89 soupda · 09-12-2011, 07:49 PM

So I tested the two far right prongs on the afm and I have no resistance. Is she toast?

I think I might already have the Lexus afm housing?

89 soupda · 09-12-2011, 07:50 PM

***bgrieger*** · 09-12-2011, 09:09 PM

did you check the voltage? key in the on position should get 1-3 volts from the ECU. The AFM itself should give 1300-3000 ohms depending on temperature in your area. I would swap another AFM tor see if that fixes it if you get the correct voltage and the resistance is 0

89 soupda · 09-12-2011, 09:24 PM

Quote:

Originally Posted by bgrieger

did you check the voltage? key in the on position should get 1-3 volts from the ECU. The AFM itself should give 1300-3000 ohms depending on temperature in your area. I would swap another AFM tor see if that fixes it if you get the correct voltage and the resistance is 0

I checked voltage at the plug, the three in the center were between 4.8 and 4.97

89 soupda · 09-12-2011, 10:09 PM

just drove all the way to my friends and got his lexus afm, still the EXAXCT same thing. now thats 2 different afm's ive tried!

***bgrieger*** · 09-13-2011, 07:40 PM

tsrm pages 56-58 and 60 have all the specs. check the new AFM as well. You may need to check right at the ECU pins to see if the ECU is alright, or wiring. My bet if the new AFM checks out is the wiring.