How many of you have had TRS issues? - Diesel Forum - TheDieselStop.com
'99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the '99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

 
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post #1 of 5 (permalink) Old 08-09-2018, 08:39 PM Thread Starter
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How many of you have had TRS issues?

So today I was coming back from a Lowes run, parked the truck to look at something for sale on a frontage lot, and came back and tried to start the truck.

No crank.

Popped the hood, did a quick visual check, nothing amiss.

Get back in, still no crank.

Thought maybe ignition switch, so I moved the column up and down, tried to light it off again, nothing. Shut it off and sat there awhile, and then thought it might be one of the interlock sensors, so I cycled the transmission selector a few times, tried it, and she lit off as usual. Shut her down, didn't crank, ran the trans selector through the whole range....tried again and it cranked.

At this point I'm thinking either a crappy connection, crap harness, or bad TRS. I'm going to clean the harness pins and see if that takes care of it. Recently I had the trans itself replaced with a HD unit, but I'm thinking that pulling the harness plug off might have loosened some things in there that aren't making decent contacts any more. The TRS itself is new, along with the trans.

Anyway....TRS, bah.
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post #2 of 5 (permalink) Old 08-09-2018, 09:14 PM
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make sure the two Torx head bolts under the steering column that hold the column in place are tight, when they get loose you will have the issue you describe. You pretty much need to stand on your head to see them

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post #3 of 5 (permalink) Old 08-10-2018, 01:08 AM Thread Starter
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Thanks, I did check those, the selector lever bolts, etc. All seem to be good, but I might dig back in if the issue persists. For now, it seems to be working, guess I'll see tomorrow.
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post #4 of 5 (permalink) Old 08-10-2018, 06:25 AM
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TRS problems are common, but almost always in the sensor portion that the PCM reads. Problems with the start circuit are much less common. With the symptoms you have, I expect a problem with the linkage, not the TRS, and especially not the wiring.

If it won't start, try it in neutral.

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post #5 of 5 (permalink) Old 08-11-2018, 11:44 AM Thread Starter
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Update: after fiddling around, I finally got her started and running, at least enough to get home. The interesting thing is that the Edge display that I use wouldn't register speed or transmission range selection (stayed in Park while driving). Transmission seemed to shift normally, but I only had a short distance to get home and I didn't push it hard. Got home, pulled the TRS connector, hit it with some Deoxit to clean up the connector and pins, and put it back on. Edge display now shows what transmission gear it's in and speed. I'm kinda thinking that the TRS is fine, but the harness or female end is a bit boogered.

Unfortunately my shop and tools are about four thousand miles south of me, but eventually I'll pull the harness and do some checks on it to see if there are some crappy connections. Wouldn't surprise me as it's the original, and I might just pick one up and swap it out, I think they're not expensive.

But I think that I'll still have to dig into the column more about the no crank condition, but at least I have a direction now.
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