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Discussion Starter #1
2001 f-350

I have been having a LOW power issue lately and determined that the passenger side uvch was loose. Went in and plugged it back in.....Tried to crank and heard something that sounded like a short under the hood. Now i have No Tach, SES, WTS or Fuel Pump and im not able to pull codes. The fuses and accessory outlets get power. my edge programmer gets power but cant pull codes. i have tried......

1. unplugging fuel bowl heater in and out of the fuel bowl
2. check and replaced fuse#30 #22 #19
3. swapped relay for pcm
4. unhooked batteries to let pcm re-set
5. checked for burnt wires
6. unplugged 42 pin connector to see if it would help
7. changed behind the stereo relay
8. unplugged ebp sensor.. heard it can cause similar issues when bad?

Anyone have any suggestions on what i can try next?

Thanks,

josh
 

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The fuel bowl fuse - put a new fuse in and unplug it at the bowl. Now do you have power to the pcm and wts?

Check the power to to pcm.



Check both valve cover harnesses again and that means with a volt meter.


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Discussion Starter #3
I pulled and replaced the fuel bowl heater fuse, unplugged it inside and out of the bowl just to be safe. I ohmed out the vc harness on the passenger side before this problem started. Do i need to test for voltage on the power side? Also i am not the most informed when it comes to electrical issues....How do i test the PCM? Easier to pull it from the firewall and bench test it?

Thanks for the help. I am a little out of my wheelhouse here.


Josh
 

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No can’t bench test the pcm simply b/c you’re not equipped. Pull the pcm out. Look at the harness above and check for 12v with key on pin 55, 71, 97 (based on that pic I gave you - sorry is 1am lol)

Make sure you cps sensor is working properly - no bad wires. No cps = no wts, no fuel. No start...



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I agree, check powers and grounds at the pcm. If those are good them the pcm is bad.

Check for a reference voltage on one of the sensors just in case it's a bad bulb or something. But no wait to start means the computer is not alive
 

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Discussion Starter #6
Sorry, it took so long to update.....After all that wire tracing and diagrams, it ended up being the big 20a fuse under the hood. I originally just tested it with the test light but when i finally went back and tested it with the multi meter...it was bad. Just wanted to update this for anyone that has a similar issue. Thanks for everyone's help.

jbw
 
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