@StarBear L Jetronic Temp Sensor II AFM |
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@StarBear L Jetronic Temp Sensor II AFM |
wonkipop |
Jun 5 2023, 03:12 PM
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#21
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Advanced Member Group: Members Posts: 4,403 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
@StarBear .
here is what i have on the Temp Sensor II inbuilt into the AFM on the 1.8 L Jetronic. i could be wrong but i don't think there is any effective way to test the air temp sensor in the AFM on our adam/eve in the garden of eden L Jetronic system. that sensor is not wired in separately. but maybe there is an expert here who knows. - in relation to the problem you are having with hot days and ultra high humidity causing the idle to drop to barely running - i'm not sure the symptom fits a faulty Temp Sensor II in the AFM. others here might know better. I would not have thought a faulty sensor would cause that dramatic a result. Temp Sensor 1 (CHT) - yes. but Temp Sensor II no. i am sure @Van B will pipe in with a more learned view. I would have thought Temp Sensor 2 fault would make the car run rich. I think that is how it would work. but again i am probably wrong. i'd have to think about it. most trouble shooting literature i can dig up says failure mode causes car to run richer generally. increased fuel consumption. |
ClayPerrine |
Jun 13 2023, 06:32 AM
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#22
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Life's been good to me so far..... Group: Admin Posts: 15,523 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Finally got up int he attic this morning to get an AFM. I am not getting up there in the afternoon when the outside air temp is 100 Degrees F.
First picture is the plug on the 6 pin Air flow meter. From left to right, the pin numbers are 39, 36, 6. 9, 8, 7. Second picture is the inside of the AFM. The two black wires come from the Air temp sensor. The easiest way to test the temp sensor is to open the air flow meter, and disconnect one of the wires from the contact going back into the AFM plug. It should be about 5.7 ohms at ambient room temp. I don't have a chart for but it is about 78 degrees F in here right now. Pins 39 and 36 are the fuel pump contacts Pin 7 goes to the center pivot contact for the air flow meter. Pin 8 is the air flow meter signal. Pin 9 is the common wire between the meter and the temp sensor. Pin 6 is the temp sensor. There is some resistance added to the circuit in the AFM before it is presented to the harness. The connection at the harness reads 281 ohms at 78F. I hope that helps everyone. |
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