code question
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Senior User
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code question
hey guys.
i've got a 97 ford f-150 that has been in my family for 10 years -- i just recently acquired it after the death of my father. We call it "Ole Blue."
Among the many problems it has, it's spitting out a code to me that says "Intake Air Temperature Circuit High Input"
Can anyone tell me what this is?
i've got a 97 ford f-150 that has been in my family for 10 years -- i just recently acquired it after the death of my father. We call it "Ole Blue."
Among the many problems it has, it's spitting out a code to me that says "Intake Air Temperature Circuit High Input"
Can anyone tell me what this is?
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Joined: Aug 2001
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From: South Texas
There is a sensor in the air intake stream called ACT (Air charge temperature). This sensor is what the code is referring to.
The failure indicates that either:
1. The sensor is giving a false high reading or (Unplugged, shorted, loss of power, etc.)
2. The sensor is defective, giving a reading outside of the expected normal range.
It's job is to measure the temp of the incomming air stream to the engine. Used together with the flow rate from the MAF sensor, the computer can calculate the density of the air charge. (hot air of the same volume versus cold air of the same volume, contain differing amounts of oxygen).
It may be located anywhere in the incomming air stream, but you may find it near the throttle body screwed into the upper intake plenum.
Dialtone
The failure indicates that either:
1. The sensor is giving a false high reading or (Unplugged, shorted, loss of power, etc.)
2. The sensor is defective, giving a reading outside of the expected normal range.
It's job is to measure the temp of the incomming air stream to the engine. Used together with the flow rate from the MAF sensor, the computer can calculate the density of the air charge. (hot air of the same volume versus cold air of the same volume, contain differing amounts of oxygen).
It may be located anywhere in the incomming air stream, but you may find it near the throttle body screwed into the upper intake plenum.
Dialtone
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Thanks. The code came on after I replaced the power steering pump -- I had to remove the air filter and breather assembly to finish routing of the belt and in order to be able to apply the belt conditioner after re-installation.
Best thing to do then would be to take the 4.6L cover off and inspect for loose/unplugged connections?
Best thing to do then would be to take the 4.6L cover off and inspect for loose/unplugged connections?
Elder User
Joined: Aug 2001
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From: South Texas
Just did a quick check of my 99 4.6 and this sensor actually is located in the flex section of the air feed duct assembly, Immediately behind the MAF. Feel around for the plug and find the loose wire connection.
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Further update -- plugging the ACT sensor back in took some of the power loss away. It's still short, but not as bad.
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