@StarBear L Jetronic Temp Sensor II AFM Options

[wonkipop]

@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.

[Rob-O]

Don’t want to get off topic but isn’t the temp sensor I only on the ‘75/‘76 models (hence the 7 pin connector)?

[wonkipop]

Don’t want to get off topic but isn’t the temp sensor I only on the ‘75/‘76 models (hence the 7 pin connector)?

here you go @Rob-O

different publications/tech manuals swap around which one to call I or II but to avoid confusion most call it II in the AFM. so i'll go back to calling it II for this. but for clarity, the one in the AFM.

74 temp sensor II in the AFM (bosch AFM 0 280 200 001)







75 temp sensor II (bosch 0 280 201 002)




its in both, in the same place, but modified design in the 75.
sticks further into airstream. altered shape of probe.
and its wired in separately in the 75.
resulting in one extra pin to make it a 7 pin. the 7th pin is for the temp sensor.
(although its not the pin at the end - its added somewhere in the middle from memory, been a while since i looked at those pin diagrams).
and likely something different going on in the ECU as well?
different ECU in the 75 from 74.

as to how its wired in and how its fixed into the AFM body in the 74s exactly i don't know in detail as i have never had mine apart. but thats the issue with the 74s. its not as easy to dig it out and replace it as a single component. i'm guessing it could be done if you had the sensor and you knew what you were doing.
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