Please help. electrical expertise needed. Start problem.
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
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From: Western Caribbean.
OK, no I missed #31 yesterday, looks like I am getting 4.5vdc, whether key is on or off. Is that DTR problem? Where is that located, is that the sensor neat the shift linkage under drivers side? How would I test that?
Cheers.
Cheers.
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
Likes: 0
From: Western Caribbean.
Mine is an auto, so according to the list it says, "Clutch interlock switch (manual
transmissions only), Transmission range sensor (automatic transmissions only) then to starter relay coil (all transmissions) ".
So is my TRS bad or am I not getting a good reading with 4.5v with the key on or off? I had to use a small piece of wire as my meter probes are too big for the fuse holes.
transmissions only), Transmission range sensor (automatic transmissions only) then to starter relay coil (all transmissions) ".
So is my TRS bad or am I not getting a good reading with 4.5v with the key on or off? I had to use a small piece of wire as my meter probes are too big for the fuse holes.
Lead Driver
Joined: Jun 2004
Posts: 6,340
Likes: 588
From: Amarillo, TEXAS!
If you aren't getting 12 volts to the fuse with the key turned to start, the problem is before the DTR sensor.
Fuse 103 feeds power to the ignition switch via a light green wire with a violet tracer.
The start circuit leaves the ignition switch on a dark green wire and goes to fuse 31.
This may sound like a silly question, but I'm not there so I just want to make sure. Where are you putting the probes to test at fuse 31? Is one on chassis ground and the other at the fuse socket?
Fuse 103 feeds power to the ignition switch via a light green wire with a violet tracer.
The start circuit leaves the ignition switch on a dark green wire and goes to fuse 31.
This may sound like a silly question, but I'm not there so I just want to make sure. Where are you putting the probes to test at fuse 31? Is one on chassis ground and the other at the fuse socket?
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
Likes: 0
From: Western Caribbean.
Yes, had to use a piece of thhn wire to get into the fuse holder (my probe wouldn't fit into it) and hitting the chassis near the fuse panel.
Definitely only getting 4.42volts from the rt side of the fuse holder with the key ON.
Definitely only getting 4.42volts from the rt side of the fuse holder with the key ON.
Last edited by pwstroker69; Aug 12, 2016 at 03:15 PM. Reason: added info
Lead Driver
Joined: Jun 2004
Posts: 6,340
Likes: 588
From: Amarillo, TEXAS!
The tops of the fuses are usually designed so you can (or at least should be able to) get a meter probe in them and make contact with the metal leg while the fuse is still in the socket. That's also very useful for checking with an ohm meter to see if one is blown. Unless it's one of the big square ones, of course.
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
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From: Western Caribbean.
Well dayum! Thanks Pika, we learn something new every day. OK, so with the fuse in, reading confirmed at 4.4vdc with key on. Does the TRS send this voltage? meaning the trs is bad?
Lead Driver
Joined: Jun 2004
Posts: 6,340
Likes: 588
From: Amarillo, TEXAS!
I need you to confirm that reading is not just with the ignition ON, but with it turned to START. To answer your question, the DTR sensor is after that fuse, so it isn't in the picture yet.
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Lead Driver
Joined: Jun 2004
Posts: 6,340
Likes: 588
From: Amarillo, TEXAS!
Before we start checking alignment of the DTR sensor and power to it, (and I really should have already asked this), have you tried holding the key to start and lifting up on the shift lever, or tried starting with the selector in neutral?
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
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From: Western Caribbean.
Ha, well I noticed I looked dumb not knowing about the testing points on the fuse, but yes, I have tried that. 
Oh, and I just checked the alignment of the tranny sensor and the marks are lined up in and with neutral.
Oh, and I just checked the alignment of the tranny sensor and the marks are lined up in and with neutral.
Last edited by pwstroker69; Aug 12, 2016 at 04:43 PM. Reason: more info
Lead Driver
Joined: Jun 2004
Posts: 6,340
Likes: 588
From: Amarillo, TEXAS!
It could be a bad sensor. There are two ways to continue with this. Either keep checking with a meter, or change the sensor and see what happens. I'm fine with helping you down whichever path you want to take. Just let me know.
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
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From: Western Caribbean.
Thanks so much, this is an area I clearly know nothing about. I will hit up the only parts guy on the island, I sold him my old 4R100, see if he has one spare. Otherwise I'll have to order and ship one and that'll be 2 weeks minimum.
Either way, I repped you earlier and will be happy to buy you beers if you make it to my part of the world.
Either way, I repped you earlier and will be happy to buy you beers if you make it to my part of the world.
Thread Starter
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Tuned
Joined: Jul 2008
Posts: 395
Likes: 0
From: Western Caribbean.
Well, I can't get him by phone and not too optimistic he'll have the sensor. If it's easier to email or fb msg me info let me know what suits and I'll msg you m contact details. We could post the results without all the uninteresting back and forth for suture reference. Thanks again amigo.