93 f150 codes?
Lead Driver
Joined: Aug 2006
Posts: 5,670
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From: Sand Lake, MI
Make sure the MAP sensor is plugged in and with clean tight connections, make sure the vacuum line is free of leaks is connected directly to the intake and that there is no check valve of any kind installed in its vac line.
There are some other possibilities but start with those verify things are as they should be with it.
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Senior User
Joined: Dec 2015
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From: Longview WA
well ill see if i can find a vaccum gauge.. im not 100% sure on how to test all that but ill dig around and see what i find.. and sorry what does KOEO and CM stand for? Im definatly new to these ford trucks.. im a mechanic on other things so vehicles is newer to me.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
KOEO = Key On Engine Off
CM = Continuous Memory
KOER = Key On Engine Run
When you run the self test KOEO is the first result returned (repeats codes twice), then the "10" separator code then the CM codes are displayed.
KOEO tests various circuits and their sensors, any failed must be corrected because if they fail during the self test they will fail during drive cycle/
CM are errors detected during drive cycles, an error has to happen more than once to trigger a code.
KOER is the same as KOEO but tests things the motor has to be running for, CM does not follow a KOER test.
An overly simplified explanation but I believe you get the idea.
CM = Continuous Memory
KOER = Key On Engine Run
When you run the self test KOEO is the first result returned (repeats codes twice), then the "10" separator code then the CM codes are displayed.
KOEO tests various circuits and their sensors, any failed must be corrected because if they fail during the self test they will fail during drive cycle/
CM are errors detected during drive cycles, an error has to happen more than once to trigger a code.
KOER is the same as KOEO but tests things the motor has to be running for, CM does not follow a KOER test.
An overly simplified explanation but I believe you get the idea.
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Senior User
Joined: Dec 2015
Posts: 267
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From: Longview WA
Alright that makes sense.. just went out and checked the connections to the map sensor everything seems fine and i cant find any cracked vaccum lines. So only flashing codes right now are 22 then the 10 spacer and 33
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
You'll have to test its circuits and see if there is a problem there,
Ford MAP/BP Sensor Operation and Testing
Takes some speical equipment to test the sensor itself, that is covered in the link above.
Myself I have yet to have a MAP sensor go bad, not suggesting its not possible just in my experience unlikely the sensor itself is the problem just more likely to be a wiring issues. Don't let that stop you from testing it if you feel it comes to that though.
Ford MAP/BP Sensor Operation and Testing
Takes some speical equipment to test the sensor itself, that is covered in the link above.
Myself I have yet to have a MAP sensor go bad, not suggesting its not possible just in my experience unlikely the sensor itself is the problem just more likely to be a wiring issues. Don't let that stop you from testing it if you feel it comes to that though.
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Senior User
Joined: Dec 2015
Posts: 267
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From: Longview WA
well im willing to test this thing.. my 10mpg is being caused by something...Almost worth just replacing it to see if it changes.. only 50$ and if its not fixed i cant return the part
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Senior User
Joined: Dec 2015
Posts: 267
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From: Longview WA
Got code 22 cleared up..now i got a new one.. code 67...though that was for automatics? Mines a 5spd. At any rate found one vacuum leak so im gonna replace all the original plastic lines with new rubber lines today.
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Senior User
Joined: Dec 2015
Posts: 267
Likes: 0
From: Longview WA
So i replaced all vacuum lines yesterday and this morning i got code 21,24, 81, 84, 33....what is up with all these codes?? is my computer bad?
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Fleet Owner
Joined: Oct 2005
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From: Kentucky
Code 21: ECT out of self test range 0.3 to 3.7 volts.
Code 24: ACT sensor out of self test range 0.3 to 3.7 volts.
These can be caused if the truck was not warmed up before running the KOEO tests. Also can be triggered if the ambient temperature is cold.
This can be a code from Continuous Memory (CM) or KOER tests:
Code 33: EGR valve opening not detected.
The code above is most likely triggered by this:
KOEO
Code 84: EGR Vacuum Solenoid circuit failure.
If the EGR Vacuum Regulator (EVR) is unplugged electrically vacuum will never be applied to the EGR valve.
And here is the reason why we need to know when the codes were displayed:
KOEO
Code 81: Air management 2 circuit failure (AM2/TAD).
CM
Code 81: MAP sensor vacuum was not greater than 2 in-Hg (7 kPa) during normal vehicle operation.
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Senior User
Joined: Dec 2015
Posts: 267
Likes: 0
From: Longview WA
Alright engine fully warmed up after i fixed some wires and taped some plugs so water would stay out.. I got code 11 then in cm code 33 So code 11 is system is ok .. correct? I finally feel like i got a step in the right direction!!
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 13
From: Sand Lake, MI
On mine it is connected via vac line and electrically active but it is blocked off so no vac leak is created, the tube to the exhaust manifold no longer exists its port is plugged so no possible exhaust leak.
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Senior User
Joined: Dec 2015
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From: Longview WA
ok awesome well im hoping that the code 33 will clear up because the egr works with a hand pump.. and i cleaned it well. The old vaccum line was broke and had been taped together ... now that i got all new vaccum lines im hoping it works and clears up.