PicoScope 7 Automotive
Available for Windows, Mac, and Linux, the next evolution of our diagnostic scope software is now available.
After following a second forum post regarding the BMW F31 N47 low-pressure Fuel Pump Controller and CAN ID 3 35, it became impossible to ignore the temptation to dig a little deeper into the data field (payload) associated with this ID.
Here is the summary of the second forum post:
ID 3 35 disappears when the fuel pump controller is disconnected from the CAN network.
ID 3 35 is transmitted on the CAN bus if the fuel pump is activated or static. However, the payload is continually updated at 1-second intervals when the fuel pump is running.
ID 3 35 is first transmitted 50 ms before the in-rush current into the fuel pump (trigger point).
Since we had proven that this ID was relative to the operation of the fuel pump, I wrote this piece to share my attempts on deciphering the data field associated with CAN ID 3 35.