Okay....More Troubleshooting on the Load Signal and Intake Air Temp Sensor
02-23-2007, 05:31 PM
#11
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17deg C here today and these were taken in one short calm drive this morning
<center><img src="http://pictureposter.audiworld.com/96745/logs_3_4_8.jpg"></center><p>there is a lot of heat in the engine bay so not surprising to see high intake temps
02-24-2007, 01:58 PM
#12
Re: Okay....More Troubleshooting on the Load Signal and Intake Air Temp Sensor
Paul
In the Basic settings, the first group displays ALL the basic values Something like ten blocks. The acceptable values are noted in the service literature for all blocks, There is a difference in load with the heater on! Mine was out of spec till I shut off the heater by cranking te fan speed to ZERO.
When I replaced the TPI, I wondered about that little brss sensor, but just cleaned it with carb cleaner spray and reassembled, figuring that any problem would show in either a DTC or an out of range indiction .
Does anyone have a table of all Measuring blocks and exactly what information is displayed? I have not made a good record of all the data I have checked, rather just going "one page at a time" With the bentley and the Vag-com open at the same time.
I still must log the O2 sensor output (word 33)
On the OBD display to better know the effects of the recent sensor replacement.
Time!
Later
ClG
In the Basic settings, the first group displays ALL the basic values Something like ten blocks. The acceptable values are noted in the service literature for all blocks, There is a difference in load with the heater on! Mine was out of spec till I shut off the heater by cranking te fan speed to ZERO.
When I replaced the TPI, I wondered about that little brss sensor, but just cleaned it with carb cleaner spray and reassembled, figuring that any problem would show in either a DTC or an out of range indiction .
Does anyone have a table of all Measuring blocks and exactly what information is displayed? I have not made a good record of all the data I have checked, rather just going "one page at a time" With the bentley and the Vag-com open at the same time.
I still must log the O2 sensor output (word 33)
On the OBD display to better know the effects of the recent sensor replacement.
Time!
Later
ClG
02-25-2007, 08:38 AM
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Re: 17deg C here today and these were taken in one short calm drive this morning
>> <i>there is a lot of heat in the engine bay so not surprising to see high intake temps</i>
The air charge in the intake tubing is moving very very fast. I don't see how it could gain 50c in the fraction of a second it exists in run from the cold air intake to the throttle blade.
A better guess would be that the brass sensor is itself heating up, from contact with the aluminum throttle body housing. But again, this would take time to occur, and so is doubtful, since the temperature readings in the measuring blocks are taken almost immediately upon starting the car.
Furthermore, what good is a temperature sensor which is 100F off from "true" due to heat soak??
So there is more at work here than meets the eye. It's probably correct.
The air charge in the intake tubing is moving very very fast. I don't see how it could gain 50c in the fraction of a second it exists in run from the cold air intake to the throttle blade.
A better guess would be that the brass sensor is itself heating up, from contact with the aluminum throttle body housing. But again, this would take time to occur, and so is doubtful, since the temperature readings in the measuring blocks are taken almost immediately upon starting the car.
Furthermore, what good is a temperature sensor which is 100F off from "true" due to heat soak??
So there is more at work here than meets the eye. It's probably correct.
02-25-2007, 09:47 AM
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I agree-and it is one question that I will ask the local dealership tech
however I expect that as long as it is within spec there is no issue here.
If this sensor is faulty then it displays a constant 20 deg reading.
This sensor is directly at back and above the engine so a lot of covection heat will effect its reading
If this sensor is faulty then it displays a constant 20 deg reading.
This sensor is directly at back and above the engine so a lot of covection heat will effect its reading
02-25-2007, 09:59 AM
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I just started my car from cold and the intake was 24 deg at cold start
This was ok as I had shifted the car from the drive an hour ago and it is around 14deg here.
The maf sensor itself is a heated wire so it will also add to the mix.
As long as the info recieved to the ecu is within a rang as desired/expected then it does not matter whether it is a true figure
The maf sensor itself is a heated wire so it will also add to the mix.
As long as the info recieved to the ecu is within a rang as desired/expected then it does not matter whether it is a true figure
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