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WOT relay

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Old Sep 1, 2006 | 12:13 PM
  #1  
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WOT relay

My Air cond is not working on my 91 Ranger. No 12 V. Can't find the WOT relay that seems to be the problem through wiring checks. Any body save me time by telling me where it is?
 
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Old Sep 1, 2006 | 12:48 PM
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I'd venture to say it's in the PDB under the hood (91 should have that).
 
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Old Sep 3, 2006 | 09:48 AM
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Nope' 91 only has the heavy fuses in there. Tried the under dash fuse box too. No luck.
 
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Old Sep 13, 2006 | 04:07 AM
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My ranger's an 89, but it's relays were underneath the PDB. I had to remove the box
from the fender to allow access to the fuel pump, eec, and wot relays. Maybe check
there, if you haven't found it yet. Good luck.
 
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Old Sep 13, 2006 | 06:53 PM
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HIJACK:
Does the WOT relay cut off the A/C compressor? My compressor says on at WOT. If it's supposted to, I guess I need to check to see that my throttle is opening all the way.
 
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Old Sep 14, 2006 | 01:49 AM
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Yes the WOT is supposed to cut off the AC compressor, the thinking is at WOT your looking for the most power you can get to pass or climb a hill etc so you don't need the draw on the engine, and secondly your not going to stay at WOT for a extended period of time so the AC bieng cut off won't be that long.
 
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Old Sep 14, 2006 | 05:46 AM
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Bob Ayers
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Originally Posted by Tiggie
HIJACK:
Does the WOT relay cut off the A/C compressor? My compressor says on at WOT. If it's supposted to, I guess I need to check to see that my throttle is opening all the way.
Your TPS could be bad also. The TPS is what tells the PCM that you are at WOT. The WOT relay uses the the NC (normally closed) contacts, so when the relay is "picked" the contacts open. So, the WOT can also cause your problem if the relay coil is open.
 
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Old Sep 14, 2006 | 07:19 AM
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Originally Posted by monsterbaby
Yes the WOT is supposed to cut off the AC compressor, the thinking is at WOT your looking for the most power you can get to pass or climb a hill etc so you don't need the draw on the engine, and secondly your not going to stay at WOT for a extended period of time so the AC bieng cut off won't be that long.
Another reason is to protect the A/C compressor itself, as it's not really designed to spin over 6K for long periods or time. In fact, a lot of higher-revving applications need special A/C compressors to handle the higher rpms.
 
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Old Sep 14, 2006 | 07:29 AM
  #9  
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Bob Ayers
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Originally Posted by Bob Ayers
Your TPS could be bad also. The TPS is what tells the PCM that you are at WOT. The WOT relay uses the the NC (normally closed) contacts, so when the relay is "picked" the contacts open. So, the WOT RELAY can also cause your problem if the relay coil is open.
....correction, beyond the post edit period
 
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