85 f150 problems
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
When you get the chance, with the key off and ECA connector unplugged;
Check each ACT sensor connector pin to ground for a short.
Jump the 2 ACT connector pins together and check the resistance at the ECA Connector Pins 25 & 46.
Check each ACT sensor connector pin to ground for a short.
Jump the 2 ACT connector pins together and check the resistance at the ECA Connector Pins 25 & 46.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
80 deg F - about 24 K ohms.
Voltage range; 3.52vdc @ 50 deg F / 0.28vdc @ 248 deg F.
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Freshman User
Joined: May 2017
Posts: 26
Likes: 0
Code 25 for the knock sensor
i will have to do a lot of this tomorrow for I won't have the timing light until then and you want me to check the ecm to see if it's sending a ground to the act right?
i will have to do a lot of this tomorrow for I won't have the timing light until then and you want me to check the ecm to see if it's sending a ground to the act right?
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Did you do the WOT during the KOER?
The two wires going to the ACT come from the ECA pins 25 & 46. You want to check that they are not grounded out, and also check the resistance, that you have a good complete circuit, also checking the connector pins on the ECA that they are not bent over.
The two wires going to the ACT come from the ECA pins 25 & 46. You want to check that they are not grounded out, and also check the resistance, that you have a good complete circuit, also checking the connector pins on the ECA that they are not bent over.
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Freshman User
Joined: May 2017
Posts: 26
Likes: 0
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Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Yes your computer, in 1985 they called them ECA's.......
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
So you probably got a 77 Code & your 25 Code, they come together when you don't do the WOT test.
Also the MAP & TPS, do not get tested along with your Knock when you skip the WOT.
Also the MAP & TPS, do not get tested along with your Knock when you skip the WOT.
