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TPS Voltage Low
Somehow stupidly I must have turned-off my chassis battery charger and juice was just too low to start the engine. I let it charge a few hours and was able to easily start the engine.
I have no idea if this is coincidence or not, but I am getting a “TPS Voltage Low” error on the DDEC control head. The cable is firmly connected at the pedal.
Two questions:
1. Any ideas?
2. Does this mean I won’t be able to drive to the service center because the engine won’t know I am stepping on the gas?
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11 Replies
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Liam,
If it is working OK you will be able to rev the engine when you step on the pedal.
If not it is not working. I can’t help other than that.
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That is what I figured. Just hoping this was something common and easy to fix or there was a “work around”.
The service book diagnostic wants me to check for “other codes” but I don’t have a reader so that is useless. I will have to see how many of the steps I can do without one.
Now I know why “fly by wire” is so scary!
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I assume you’ve tried a reboot by turning the ‘ignition’ off.
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Just grabbed my flashlight and headed down to diagnose. I pulled the pedal back and cycled the sensor through its range several times and blammo, the check engine light went out and Miss DDEC now happy. My guess is inside is an old fashioned rheostat that just got dirty. Bummer if that went out on the road!!
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Liam,
You can flash the codes using the check engine light, but I don’t remember the procedure. I’ve done it, but the ole memory isn’t what it used to be.
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I read that in the manual but it didnt make sense how a light on the dash could do that. I will have to dig through the manual and learn.
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Mine was doing the same thing. I looked into my SilverLeaf glass dash alarm history and discovered the alarm was raised more times than I had noticed. The rheostat is far more expensive than I would have ever guessed. Buy it from Prevost and you can save nearly $100 over what I paid at the Detroit facility in Vegas.
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Thanks everyone.
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Just replaced the TPS today. Thought it would be an easy swap but no such luck. New sensor has a different connector so it came with a new cable. Instead of just swapping sensors, I had to remove the whole pedal assay. Worst part was crawling into the bumper compartment to find the connection on the other end which was tie-wrapped in a hard to reach area.
Did they use child labor to wire this bus??
Better than a day at the office though.
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I think was a test for you Liam:)
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No Joke, I know three guys that worked at the Prevost conversion facility in Oklahoma. I can not recall the converter but it was later ran by Featherlite. They declare up and down that there was a very short man that worked there and did a lot of work in the bays.
DKO
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