@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.

[ClayPerrine]

The original CAN be tested. But the values will be quite different from what you got testing the sensor directly.


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.


The board in the AFM adds resistance to the temp sensor circuit, so the readings won't be the same as the ones checking at the wires. But you can hook the wires back up and repeat the temp testing at the AFM plug.

[StarBear]

The original CAN be tested. But the values will be quite different from what you got testing the sensor directly.


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.


The board in the AFM adds resistance to the temp sensor circuit, so the readings won't be the same as the ones checking at the wires. But you can hook the wires back up and repeat the temp testing at the AFM plug.

Hmmm. Will try that. Thanks.