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ECM problem

Tiny
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Have you tested the scanner cable as yet, and is this second wire brown or brown/white as the diagram shows no brown only.

Mark
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Tuesday, June 22nd, 2010 AT 5:10 PM
Tiny
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I tested the scanner cable and the only continuity was between those same two terminals. The two wire colors are : white/black and also brown with silver or white tracer dots. I am thinking this is the wire shown as brown/white because it is the only "brown" wire on the connection.
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Tuesday, June 22nd, 2010 AT 6:43 PM
Tiny
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Am trying to find out what the pins on the data link that you bridged go to, this is driving me insane trying to get this sorted. Lol

mark (mhpautos)
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Tuesday, June 22nd, 2010 AT 7:08 PM
Tiny
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What is cg and sg?
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Wednesday, June 23rd, 2010 AT 3:58 AM
Tiny
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I have no idea, and there is no indication in Mitchell 1 either, this is what I am trying to find out.

Mark
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Wednesday, June 23rd, 2010 AT 4:26 AM
Tiny
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Well, I know the wire is getting hot. There has to be on the schematic what we are jumping out. It looks like the electronic wiring diagram only shows the two wires going to the firewall and the other to the dash, and that is all that the diagram is showing. It does not show where the two wires continue onward to.
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Wednesday, June 23rd, 2010 AT 11:35 AM
Tiny
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We have to figure out what these two wires are jumpering out. White/black & Brown/white
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Friday, June 25th, 2010 AT 12:32 PM
Tiny
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Is this a Sienna CE, LE, XLE?
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Friday, June 25th, 2010 AT 2:23 PM
Tiny
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It is a CE model 6 cyl auto, jumper those two wires and the van will start and run.
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Friday, June 25th, 2010 AT 2:43 PM
Tiny
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I went to a Toyota Dealer here and they have no information on Sienna as it is not marketed here so they don't carry manuals, maybe Jack can find out a bit more,

Mark (mhpautos) in Australia.
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Friday, June 25th, 2010 AT 8:10 PM
Tiny
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Somebody on toyota nation. Com suggested that I read out resistance on the brown wire to ground and the white wire to ground.
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Friday, June 25th, 2010 AT 11:16 PM
Tiny
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Definitly Ohm them out to ground.I cant seem to find the Brown/white wire in theschematic I have (Mitchell) but the White/black goes to a ground behind the right side of the dash and it shares that ground loop with the "Transponder Key Amplifier" So if this gound circuit is bad, it may not be seeing the key in the ignition which would expalin why it wont run


https://www.2carpros.com/forum/automotive_pictures/1639_yota1_2.jpg

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Saturday, June 26th, 2010 AT 9:22 AM
Tiny
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I read out the brown/white tracer wire to ground and I get continuity to ground with 8.1 ohms on a (200K) setting on the ohmeter. When I read out the white/black tracer wire to ground, I get.5 ohms on a (200) scale. White/black wire continuity but no resistance?
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Saturday, June 26th, 2010 AT 1:32 PM
Tiny
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Both wires should be good grounds, like the white/black.I found the other in the ground dist wiring diagram.looks like you may have a bad ground that is being substituted by the jumper when it is plugged in


https://www.2carpros.com/forum/automotive_pictures/1639_yota3_1.jpg

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Sunday, June 27th, 2010 AT 9:39 AM
Tiny
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A number of techs have suggested that the key reader (key amplifier) may well be the problem, do you have alternative keys to try out?

Mark (mhpautos)
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Sunday, June 27th, 2010 AT 10:17 AM
Tiny
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Well, this particular van does not have a transponder chip in it. When I got keys cut I never had to program a key. It is a 2001 sienna ce. Are you suggesting there is a problem with my key not having the proper transponder chip that is correctly working in it? I just went to a hardware store to cut a new key before. I DO HAVE another key that I can try and let you know. But, I am almost certain the key has no high tech functions. Where is the key amplifier by the way?
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Sunday, June 27th, 2010 AT 1:02 PM
Tiny
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I tried another key and it did not work.
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Sunday, June 27th, 2010 AT 1:13 PM
Tiny
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Did you check the ECM grounds on the diagram I posted?If it runs with that grounded and the ground circuit has that much resistance for the ECM it cant ground on its own. The white/black has good continuity to ground, I dont think its the problem, the other should have the same but doesnt. The key may not need a chip, just sees a key going in so it knows it isnt being hot-wired
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Monday, June 28th, 2010 AT 7:48 AM
Tiny
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It is hard to read the schematic, I will try more. Is it possible to send a better one or hand draw something?I cannot see what you are talking about, but we are getting very closer now! So, the one wire has higher resistance than the other, does to ground? Is that the bad circuit because it has so much resistance 8.1 vice.5? When you read the diagram what do you think I should do next? So maybe the key in the ign. Reader is on my van for sure? Is every 2001 sienna built with a key amplifier that reads the key in the ign?
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Monday, June 28th, 2010 AT 11:50 AM
Tiny
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There is a main ground on the right side of the firewall that the ECM uses as well as the data connector.Im sure they all have a key reader, it has been used for a long time, since the chipped keys turned out to be kind of unreliable


https://www.2carpros.com/forum/automotive_pictures/1639_yota4_1.jpg

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Monday, June 28th, 2010 AT 7:24 PM

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