SOLVED! Broke down New Mexico

Scott & Heather · October 27, 2016, 11:02:24 AM

No smoke at all from exhaust

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luvrbus · October 27, 2016, 11:29:10 AM

Scott, on the front pulley that has 8v92 embossed check behind it to be sure the pickup sensor hasn't come loose

Scott & Heather · October 27, 2016, 12:18:28 PM

Cliff I looked and looked and could not find a sensor anywhere?

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luvrbus · October 27, 2016, 01:23:52 PM

Look a little deeper on the back side of the end plate there should be 4 wires 2 sensors with 2 plugs unless the aliens struck

,but I want you to check the pulse wheel that is held in place with screws to the pulley ck and see if it is loose

brmax · October 27, 2016, 02:10:43 PM

possibly at 12 backside is a mount, adjacent left should be one.
itsa 2 flips standing on your head thing they stuff it in
and glad your in town, good day
Floyd

Scott & Heather · October 27, 2016, 02:15:26 PM

Ok checking this right now. I left my wiring schematic in Michigan. Anyone can tell me what wire 952 is?

Timkar · October 27, 2016, 02:21:53 PM

From what I can find for a DDEC2 wire 952 is throttle position sensor ground HTH It's for a Peterbilt but DDEC wiring probably the same.

DDEC2 wiring info link..

http://84.204.204.67/Electro/SK20627.pdf

brmax · October 27, 2016, 02:26:57 PM

spot on Timkar,
I think Detroit wiring, so its pretty much used throughout the builders probably.
showing 417 and 916, with the 952 you mention for the tps
now ? is why

Timkar · October 27, 2016, 02:41:01 PM

Here is a link to DDEC2 troubleshooting manual from the wanderlodge forum (large file)
http://www.wanderlodgeownersgroup.com/downloads/DDEC%20I,%20II%20and%20III-IV%20Schematics_files/DDEC_TS.pdf

Scott & Heather · October 27, 2016, 03:29:27 PM

I have the 500 page DDEC II troubleshooting manual thanks to Ken Arnold, but I'm still trying to sort out where to look first. In the rear wiring panel above the muffler of the bus (drivers side, side engine door) I noticed wire 952 just hanging loose with a bare end. There's a three prong plug hanging nearby with only two wires going to it. Labeled "A" "B" "C". This plug plugs into another plug that has resisters stuck in it and everything is heatshrink tubed. Any thoughts?

Iceni John · October 27, 2016, 04:23:29 PM

On my bus 916 is a 5V Sensor Supply (red/black) and 417 is a Throttle Position Signal. 916 and 952 (Sensor Return, black) in my bus go from the Fast Idle switch through two resistors to the Williams accelerator pedal, from where 417 goes back to the ECM. If any of these wires or the resistors are kaput, the engine won't fire - at least, mine didn't when I had some bad wiring for the Fast idle.

John

belfert · October 27, 2016, 04:43:12 PM

Quote from: Scott & Heather on October 27, 2016, 03:29:27 PM
I have the 500 page DDEC II troubleshooting manual thanks to Ken Arnold, but I'm still trying to sort out where to look first. In the rear wiring panel above the muffler of the bus (drivers side, side engine door) I noticed wire 952 just hanging loose with a bare end. There's a three prong plug hanging nearby with only two wires going to it. Labeled "A" "B" "C". This plug plugs into another plug that has resisters stuck in it and everything is heatshrink tubed. Any thoughts?

My only thoughts are that the copper on that wire looks pretty fresh like a break occurred recently, but pictures can be deceiving. On the other hand the wire strands look pretty twisted if they just pulled loose from something.

One annoying thing about my bus is cut wires everywhere under the dash. Everything works and has mostly worked for years, but it makes troubleshooting harder. You never know if something broke or came loose, or if it was just cut long ago.

luvrbus · October 27, 2016, 04:46:42 PM

They break the system into 2 parts 1 is the DDC responsibility which covers the engine the other is the OEM responsibility that covers the rest of the wiring, you never know with the wires without the OEM wiring schematics it really sucks most of the time. The 500 page trouble shooting manual is sorta of useless without the application and OEM manuals IMO

brmax · October 27, 2016, 05:39:24 PM

Scott that's where it goes on mine, I didn't remove mine as I cannot find the larger release tool, seems I have tool for the other side.
Floyd

Scott & Heather · October 27, 2016, 05:48:49 PM

Been talking a lot to Ken and he's working me through this but we are still at a loss. I can't get any check engine light to come on and I've even spliced into wire 419 at the ECM to try and get flashes on a test light but nothing. He's sending me an ECM and diagnostic tools/computer to read codes but i won't get it until probably Tuesday of next week. This is starting to bum us

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