I hate to beat a dead horse, did you meter all 3 of the fusible links? When my harness went (on top of a mountain), it blew one of the links two were good.
Anything else to try before replacing ECM? Help in northern New Mexico?
- Thread starter MountainBum
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- #22
They are good. Everything is getting 12V power just fine. The ECM is getting 12V at all input wires when the ignition in on. It's the VCC 5V output to the TP and VAF that isn't outputting 5V. Or it is grounding out somewhere. But the VCC line only goes to those 2 components, so at least I know where to look. I'm going to unplug the sensors and recheck the 5V output. I'm hoping that the check light comes back on and ECM starts outputting again, then at least I can be sure its wires or compnonents and not the ECM. Electrical suuuuuuuuuucccccccckkkkkksssss!
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- #23
Yea!!!!!!!!!!!!!!!!
Thanks Landtank!!!!!!!
ECM SEEMS to be fine. I unplugged the TP and VAF and my check light came back on!!! Then plugged in the TP and check light still on, then VAF and it all went bad, no check light. So I checked voltage on the VCC and with the VAF unplugged, I had 5 good volts at the ECM and at the VAF plug. Once I plugged in the VAF, the voltage went out, both at the ECM and at the VAF plug. So I started doing ohm checks on the VCC line. With the ECM unplugged, VAF unplugged, and TP plugged in the resistance in the VCC line was about 3K ohms, normal. I then plugged in the VAF and the resistance went totally haywire. This indicates that the VAF went bad and has grounded out the VCC line inside the VAF somewhere. So I am now searching local yards for used VAF.
Does anyone know if the VAF on the LC was used on any other Yota's?????? It's hard to find LC's here in New Mexico.
Thanks Landtank!!!!!!!
ECM SEEMS to be fine. I unplugged the TP and VAF and my check light came back on!!! Then plugged in the TP and check light still on, then VAF and it all went bad, no check light. So I checked voltage on the VCC and with the VAF unplugged, I had 5 good volts at the ECM and at the VAF plug. Once I plugged in the VAF, the voltage went out, both at the ECM and at the VAF plug. So I started doing ohm checks on the VCC line. With the ECM unplugged, VAF unplugged, and TP plugged in the resistance in the VCC line was about 3K ohms, normal. I then plugged in the VAF and the resistance went totally haywire. This indicates that the VAF went bad and has grounded out the VCC line inside the VAF somewhere. So I am now searching local yards for used VAF.
Does anyone know if the VAF on the LC was used on any other Yota's?????? It's hard to find LC's here in New Mexico.
1994
Air Flow Meter
Toyota Land Cruiser 4.5 A 804903 $Call A-1 Auto Salvage USA-NM(Kirtland) E-mail 1-505-325-1994
1993
Air Flow Meter
Toyota Land Cruiser SLV,4.5,AT, C 029956 $Call Highway 64 Truck and Auto Salvage USA-NM(Kirtland) Request_Quote 1-866-334-5092 Request_Insurance_Quote
Air Flow Meter
Toyota Land Cruiser 4.5 A 804903 $Call A-1 Auto Salvage USA-NM(Kirtland) E-mail 1-505-325-1994
1993
Air Flow Meter
Toyota Land Cruiser SLV,4.5,AT, C 029956 $Call Highway 64 Truck and Auto Salvage USA-NM(Kirtland) Request_Quote 1-866-334-5092 Request_Insurance_Quote
- Thread starter
- #25
Thanks, that is sweet!
That is about an hour down the road. If they're there, I should be back on the road tonight!!!!!!!!!!!
Glad I could help. Looks like you found your short. I personally would can opener that bad boy up and try and fix it. It's probably a chaffed wire to a metal surface. Those things are about as complicated as a slot car speed controller.
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- #27
Might as well, its shot anyway. Better than a 4 hour round trip out to Farmington to pick a used one up!
edit: My FSM is iffy. The VAF resistance chart show VS - E2 twice. So I did not know what VC - E2 should have been until I opened my Hanyes manual which actually had the correct chart. If I had known what VC-E2 was supposed to be I would have found the problem last weekend!
edit: My FSM is iffy. The VAF resistance chart show VS - E2 twice. So I did not know what VC - E2 should have been until I opened my Hanyes manual which actually had the correct chart. If I had known what VC-E2 was supposed to be I would have found the problem last weekend!
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- Thread starter
- #28
Went ahead and picked up a used VAF, works perfect, the beast is back on the road!!!!!!!!!!!!!!!
excellent !
alia176
SILVER Star
Congrats dude, you deserve a nice reward for powering your way through the electrical troubleshooting steps!
Hopefully we'll meet up some day on the trail.
Hopefully we'll meet up some day on the trail.
- Thread starter
- #31
Thanks
Hey, I'll PM you the next time I plan a little wheeling adventure. How's your rig set up? Lift and tires? There's some great stuff between ABQ + SF. From mild to hold on to your shorts!
reconranger
SILVER Star
Landtank is the man.
X2...
congradulations, I know first hand what a PITA electrical grimlins are to track down. I'm gratefull for this site and the people on it for making it possible to hunt down stuff like this !
alia176
SILVER Star
sent you an email.
Thanks guys but this is what I do for a living and don't discount the excellent work that MountainBum did.
I work with professionals that wouldn't have gotten as far as he did in diagnosing this thing with his VOM.
nicely done!!
I work with professionals that wouldn't have gotten as far as he did in diagnosing this thing with his VOM.
nicely done!!
I think I have a similar issue with my '97 lx450. The shop can't figure it out and wants to get an ECM for it. What is a VAF and TP that you're referring to and what plug is it on the output of the ECM? Thanks,
Chris
Chris
- Thread starter
- #37
The 95-97 have a MAF, typical Mass Air Flow Sensor with a different ECM set up, not the VAF. The TP is the Throttle Position Sensor. You'll need the wiring diagrams for a 97 to get the right ECM connections.
Ah, so the 97's don't have a VAF, then, but do you think this may still be the culprit?
Chris
Chris
