MAP reads -13psi intermittently

[m j]

2002 f550 7.3 zf6 dpc-461 gdu3
replaced MAP sensor no change. giving the pcm a kick gets it to read correctly. chased the wires, cant see anything wrong with it. pins on ecm are clean, ecm is not full of water, appears unmolested.

any hints on diagnosing this?

TIA

 

[6.0 Tech]

2002 f550 7.3 zf6 dpc-461 gdu3
replaced MAP sensor no change. giving the pcm a kick gets it to read correctly. chased the wires, cant see anything wrong with it. pins on ecm are clean, ecm is not full of water, appears unmolested.

any hints on diagnosing this?

TIA

What does baro read when this happens?


Sent from my iPhone using Tapatalk

 

[m j]

What does baro read when this happens?


Sent from my iPhone using Tapatalk

ah good thinking. thanks i will monitor that.

 

[m j]

i will have to find the torquepro thread for superdutys to get the pid for vehicle baro. it isnt in torquepro natively

 

[lincolnlocker]

Does it have a ts chip in the pcm?

 

[m j]

Does it have a ts chip in the pcm?

never had a chip. I am thinking its corrosion in the connector. next time i get in there i am going to depopulate the connector and see if there is an issue there. if i pull connector and hose with contact cleaner its symptom free for weeks. thanks