U1011 Citroen Invalid or Missing Data for Engine Air Intake
Possible causes
– Harness or connectors (CAN communication line is open or shorted)
– ECM
– ECM
What about the obd code?
When detecting error during the initial diagnosis of CAN controller of ECM.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
U1011 Citroen Description
CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.
Each control unit transmits/receives data but selectively reads required data only.
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