How Do You Check ?
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Joined: Jun 2003
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How Do You Check ?
89 E150 4.9 efi
I just replaced the cooling temp sensor and intake air charge sensor in april.
now I'm getting code 21 and 24 again.
Does anyone know how I can check these out before buying new one's?
thx
john
I just replaced the cooling temp sensor and intake air charge sensor in april.
now I'm getting code 21 and 24 again.
Does anyone know how I can check these out before buying new one's?
thx
john
Moderator
Joined: Jan 2001
Posts: 56,965
Likes: 2,725
From: Virginia
When you extract the codes from the computer, the coolant temperature has to be at least 50 degrees, and not more than 250 degrees, if you do the engine off test, or you will get a fault code 21.
When you do the engine running test, the coolant temp has to be at least 180 degrees, and not more than 250 degrees, or you will get a code 21.
Also the same with code 24. The temp of the air in the intake manifold has to be greater than 50 degrees, but less than 250, or you will receive a code 24.
If you want to check the coolant sensor or the air temp sensor, they have the following resistance values at these temps.
degrees-----value in ohms
50----------58,750
68----------37,300
86----------24,270
104---------16,150
194---------2,800
212---------2,070
When you do the engine running test, the coolant temp has to be at least 180 degrees, and not more than 250 degrees, or you will get a code 21.
Also the same with code 24. The temp of the air in the intake manifold has to be greater than 50 degrees, but less than 250, or you will receive a code 24.
If you want to check the coolant sensor or the air temp sensor, they have the following resistance values at these temps.
degrees-----value in ohms
50----------58,750
68----------37,300
86----------24,270
104---------16,150
194---------2,800
212---------2,070
Moderator
Joined: Jan 2001
Posts: 56,965
Likes: 2,725
From: Virginia
Yes, that's right. Also during one of the tests, it will give a single pulse, which starts the "throttle goose" test. If you don't rev the engine past 2000 rpm after it gives you the signal, it will give out some more codes.
