The G42 sensor part number 034905379B I am sure you are all aware is NLA. I cannot find a new replacement so I am looking to do the following.
Check the ECU reading from about 20 to 40 deg cel and the sensor resistance at the same points. If its out then can I just calibrate it by adding a resistor in series or parrallel as needed.
Can you buy a PTC replacement component and then calibrate it. Does anybody know where and what to buy as a suitable PTC sensor that can be soldered in.
Twice recently I was out early in the morning and the outside temperature was below 18 deg cel which is cool for us and the car was running well no issues. As the day got warmer 28 deg cel the car was starting to drop in performance. I will also add that we do also get outside temperatures of 35 to 43 deg cel and the car does not perform. From going through the forum a thread advises at 40 deg IAT the ECU goes into a protection mode of some sorts and pulls back timing or boost. The outside temperature at 35 to 43 deg cel is obviously an issue in SA. But at 25 deg I do not think there should be any need to pull back timing or boost unless the sensor is causing an issue.
My concern is the accuracy of my G42 sensor.
It would be nice if the G42 sensor repair or replacement can be solved.
Below is some of the data I found on the forum. I cannot confirm the accuracy of my info.
G42 Datasheet (s2central.com)
PTC TYPE
The G42 IAT is connected to the ECU via pin T55/44 with a blue striped brown wire (BR/BL). A digital multimeter can be used to measure the resistance of the two-pin device G42 intake air sensor with the connector harness removed. With the engine OFF long enough to cool sufficiently, at an ambient air temperature of 20 degrees, a value of 450-650 ohms should be measured across G42.
The resistance should be approximately 500 ohms at 25C (70F). The resistance measured doesn't need to be "exactly" as shown, it just needs to be close to the value shown.
Here is a graph of the sensor resistance versus temperature.
Check the ECU reading from about 20 to 40 deg cel and the sensor resistance at the same points. If its out then can I just calibrate it by adding a resistor in series or parrallel as needed.
Can you buy a PTC replacement component and then calibrate it. Does anybody know where and what to buy as a suitable PTC sensor that can be soldered in.
Twice recently I was out early in the morning and the outside temperature was below 18 deg cel which is cool for us and the car was running well no issues. As the day got warmer 28 deg cel the car was starting to drop in performance. I will also add that we do also get outside temperatures of 35 to 43 deg cel and the car does not perform. From going through the forum a thread advises at 40 deg IAT the ECU goes into a protection mode of some sorts and pulls back timing or boost. The outside temperature at 35 to 43 deg cel is obviously an issue in SA. But at 25 deg I do not think there should be any need to pull back timing or boost unless the sensor is causing an issue.
My concern is the accuracy of my G42 sensor.
It would be nice if the G42 sensor repair or replacement can be solved.
Below is some of the data I found on the forum. I cannot confirm the accuracy of my info.
G42 Datasheet (s2central.com)
PTC TYPE
The G42 IAT is connected to the ECU via pin T55/44 with a blue striped brown wire (BR/BL). A digital multimeter can be used to measure the resistance of the two-pin device G42 intake air sensor with the connector harness removed. With the engine OFF long enough to cool sufficiently, at an ambient air temperature of 20 degrees, a value of 450-650 ohms should be measured across G42.
The resistance should be approximately 500 ohms at 25C (70F). The resistance measured doesn't need to be "exactly" as shown, it just needs to be close to the value shown.
Here is a graph of the sensor resistance versus temperature.
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