low power/engine codes
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
The PIP wire should have 6 VAC on it.
The PIP either will work or not.
It can work then when the engine gets hot it shut you down like turning off the key.
When the engine cools back down it will restart most of the time.
The PIP either will work or not.
It can work then when the engine gets hot it shut you down like turning off the key.
When the engine cools back down it will restart most of the time.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
The PCM computer requires a higher voltage then the ICM from the PIP.
So a lot of engines will run with the SPOUT out and not with it in.
With the SPOUT out the ICM takes over the spark duties from the PCM Computer.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
65 says you did not press the OD Switch when you should have.
65 indicates that Overdrive Cancel Switch (OCS) is not cycled between the engine ID code and the "Goose Test" in Key One Engine Running Self-Test.
Sorry if I miss lead you I must not have read the text right before.
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Freshman User
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maybe i did do the test wrong. what your saying is when i goose it, i should also press the o/d switch. i didn't do this. i have cleaned and swapped out the IAB, but i am still getting this code 12
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
Service Code 12 indicates that during Engine Running Self-Test, engine rpm could not be controlled within the Self-Test upper limit band.
Possible causes:
Open or shorted circuit
Throttle linkage binding
Improper idle airflow set
Throttle body/ISC solenoid contamination
Items external to Idle Speed Control system that could affect engine rpm.
Damaged ISC solenoid
Damaged processor
Possible causes:
Open or shorted circuit
Throttle linkage binding
Improper idle airflow set
Throttle body/ISC solenoid contamination
Items external to Idle Speed Control system that could affect engine rpm.
Damaged ISC solenoid
Damaged processor
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Freshman User
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ok, i checked the voltage at the iab wires, it measured good. i will check the idle air, isc solenoid and get back on here tommorow. by damaged processor, do you mean the computer?
thanks, maybe i am getting somewhere, i have been quite stalled.
thanks, maybe i am getting somewhere, i have been quite stalled.
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Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
I would not change it until I had more proof of it being bad but it may be bad.
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Freshman User
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I am comfused by the ISC (Idle speed control), i'm not sure what it is. Is this the BYP valve on EFI, or is it something else? about where is it located and what does it look like, i'm not finding much about it in my book.
thank,
Brian
89 5.8
new today 91 straight 6 with 4 speed manual!
thank,
Brian
89 5.8
new today 91 straight 6 with 4 speed manual!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
I am comfused by the ISC (Idle speed control), i'm not sure what it is. Is this the BYP valve on EFI, or is it something else? about where is it located and what does it look like, i'm not finding much about it in my book.
thank,
Brian
89 5.8
new today 91 straight 6 with 4 speed manual!
thank,
Brian
89 5.8
new today 91 straight 6 with 4 speed manual!
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Freshman User
Joined: Apr 2009
Posts: 35
Likes: 0
ok, i've swapped this out with no change. this leads me to think maybe there is something wrong with the computer. the only other thing would be to adjust the idle speed, but i wasn't sure this affected how it would run when driving. am i wrong? it idle's fine. when you first start it, it idle's fast for just a few seconds, then drops down to a slow idle.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
I really dough that there is anything wrong with the computer but it was just in the check list from shop manual for code #12.
When it did the KOER test did the engine got higher rpm and then back down while the test was running?
Did it sound OK?
It is possible that you may have a bad TPS, I think I would check it with a DVM to see if it has the right voltage output to the computer through its range.
When it did the KOER test did the engine got higher rpm and then back down while the test was running?
Did it sound OK?
It is possible that you may have a bad TPS, I think I would check it with a DVM to see if it has the right voltage output to the computer through its range.
New User
Joined: Jul 2009
Posts: 18
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From: East TN
I have an 89 5.0 with the same problem and I replaced the MAP sensor and a Ford tech told me to replace the fuel regulator...it seems mine back fires and pops when cold not as bad when hot...? not sure.. but I am replacing the regulator tomorrow will post up to see if that works...side note....my front fuel tanks reads past full even though empty and the rear reads empty when full???? I also wondered if this could be computer gone bad...or just crummy pump
Tuned
Joined: Mar 2009
Posts: 373
Likes: 0
From: Ohio
moe you could possibly have a bad computer or more likely wiring or fuel pump sending unit. id wait for subfords response though. from what ive seen he knows just about everything about the electronics in these trucks, very well read
