Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I have a 1999 Ford f350 V10 I have 11 volts on a 5 volt reference wire so I cut the wire at the pcm and still have 11 volts on coolant sensor wire going into cluster so I replaced my pcm 3 times and it blows the coolant sensor circuit on pcm any ideas thanks
you have something shorting to voltage on the 5v Ref circuit (depending on the vehicle and year, the PCM may have 2 (or more) 5V Ref circuits, but they should be labeled 5V Reference 1, 5V Reference 2, etc.) you can have multiple sensors working off of one 5V Ref...it sounds like you have either another sensor faulty and shorting to voltage internally or you have a wiring issue where your 5V ref wire is rubbed through into a 12V wire. you need to locate all the sensors using that 5V Ref circuit and unplug them one by one and check to see if the voltage goes away after (each) one is unplugged (leave them unplugged once you unplug them until all of them are unplugged)...if you unplug them all and it is still there, then your going to be looking for wires rubbing together etc. you almost certainly need access to accurate wiring diagrams to sort the issue out. Other's may have more ideas.
Last edit: 3 years 3 months ago by JEFFSSEI. Reason: clarification
The following user(s) said Thank You: twinscrew9.0.twinscrew9.0
Topic Author
