Detroit 14 Liter Turbo Speed Sensor - Input Failure

Just overhauled a 14 liter Detroit and installed new turbo. Owner picked up the truck and when he accelerates the check engine light comes on. The code is PID 103 FMI 8 Flash code 64 Turbo Speed Sensor - input failure

I replaced the sensor and he is still getting fault. When he is sitting it will not come on. You can rev up the truck and it will not come on. Only when he is driving. I had the computer hooked to it and we drove down the road and when the engine light comes on the turbo speed goes to zero.

He has a small leak in his charge air cooler. Other than that I don't see anything.

Any thoughts?

 

Do you think he would have any issues running it like that? He scheduled a load for the truck before I was even finished putting the oil pan on it. I checked the wires going back to ECM like it says to do in troubleshooting guide and they checked out OK. The next step in guide was turbo but that is new. Then air leaks in system. I showed him the leak but he said the check engine light was not doing that before. But his old turbo was about froze up. I could barely turn it. He had a large hole in his pipe from air cleaner to turbo. I fixed that.

 

I will have to get him back in here and look it over some more. Thanks for the responses. I will let you know what I come up with. If anyone else has any thoughts I will listen.

 

The guy finally brought the truck back. I checked the wires from sensor to ECM. They checked out ok with OHM meter. If I am reading the schematic for the wires for this sensor it works off of frequency?

I have access to DDDL and reports but that is all. I am not getting any turbo speed at any time now though. I drove the truck down the road and other than the check engine light coming on when you are pedal mashing it runs fine. I can't notice any change in power.

 

Well I will not be figuring out anything on this issue. The owner had an accident yesterday. Said someone cut him off and he went over. http://www.live5news.com/story/30900022/traffic-alert-accident-shuts-down-i-26-eb-near-jedburg-exit