First time pulling codes.......
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Posting Guru
Joined: Apr 2009
Posts: 2,447
Likes: 1
From: Northern Idaho
First time pulling codes.......
So I just recently purchased a Vehicle Auto Enginuity code reader from Clay and had all sorts of codes in my PCM so I cleared them to see which would come back. So far I have B1450 - Wiper Wash/Delay Switch Circuit Failure and P0470 - Exhaust Pressure Sensor. I checked what the EBPS was reading and it was reading a steady 23PSI, so last night I pulled the EBP Sensor and cleaned as much of the crud out of it as I could but the bugger came back.
It's currently reading 20 PSI and it does fluctuate as I drive but I don't think it's supposed to be at 20 PSI all the time, correct?
Also, another question I had was the coolant temp sensor. According to the Engine Coolant Temp Input I was getting temps as high as 600 and after sitting for an extended period of time I was getting temps at about 150* to 200*. Could this mean a faulty temp sensor? I checked the temp sensor on my wifes van that she had driven around all day long and it was reading 83* and our weather today got up to about that, though when I read the temp it had cooled down to about 72.
Any thoughts? I think it's time for me to replace the EBPS before it starts to really give me problems, that or get a EBP pigtail.
It's currently reading 20 PSI and it does fluctuate as I drive but I don't think it's supposed to be at 20 PSI all the time, correct?
Also, another question I had was the coolant temp sensor. According to the Engine Coolant Temp Input I was getting temps as high as 600 and after sitting for an extended period of time I was getting temps at about 150* to 200*. Could this mean a faulty temp sensor? I checked the temp sensor on my wifes van that she had driven around all day long and it was reading 83* and our weather today got up to about that, though when I read the temp it had cooled down to about 72.
Any thoughts? I think it's time for me to replace the EBPS before it starts to really give me problems, that or get a EBP pigtail.
Lead Driver
Joined: Jun 2003
Posts: 8,298
Likes: 25
From: Damon (South East Texas)
I am a victim of the extremely high temp readings as well. I noticed the same thing when I was monitoring some live data meter after I did my spider mods. From what I understand the PCM relys more on engine oil temp. The coolant temp is used on manual trans. I still don't know why this is true. I tried to research this on my Ford dvd manual and still was left 
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Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
Like Roland said the coolant temp reading on an automatic goes all over the place. When using AE on my early 99 to read coolant temp it would go over 500° and then drop to near zero and start climbing all over again. The PCM pin out for the leads to coolant temp end up being TFT (Tranny Fluid Temp?). Still doesn't expalin the radical readings though.
