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Low voltage to throttle sensor
Hi,
We are having issues with our 1991 Prevost Country Coach throttle control. DDEC 2 code reads throttle positioning sensor low voltage. I have a new sensor on order and started disconnecting the old one checking the connections. Re-connected the old throttle sensor and now the coach will not turn over.
I thought I had read some time ago that if this is disconnected that the DDEC 2 would have to be “re-programmed”. Is that true? If so how is the re-programming done? Thanks in advance. Steve
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5 Replies
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Steve, I had an issue with the TPS on my 87 DDEC I coach. It turned out to be a bent connector pin that wasn’t making contact. My point is I disconnected it straightened the pin and problem solved. No programming was required but maybe DDEC II is different but I doubt it.
Your issue if you feel it is the TPS can be addressed by any Detroit dealer. Or Prevost. Or a quality diesel shop with the software to read DDEC.
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what jon said ! keep us posted so we can go further. Check your fuse/fuse holder on ddec2 it has seperate power supply and it’s own ground. requires 11.6 volts to run.
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Thanks Jon! The coach started fine until I disconnected the TPS cable fitting behind the bumper, cleaned and re-connected. I then tried to start it and it won’t even turn over. Not sure if the two things are associated though.
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I replaced one on a DD 3 and all I did was plug and play ,this wasTPS on foot throttle.
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the supply to ddec is off one battery. ck and see if you have 1 batt below 12.5 resting. also like Jon said make sure when you reconnected you didn’t push a pin into connection or bend
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