Absence of Spare bus communication (CAN6 buffer overflow)
شرح
The fault is validated as present if the ECU tries to send CAN-messages on the Spare CAN-bus, but no acknowledge is received from other unit(s), and thereby causing the internal buffer in the DAS to overflow. The DTC is set to active if the buffer overflow has lasted for 50 ms. The DTC is set to inactive when the CAN-messages are sent properly again and the buffer no longer is overflowing for the last 1050 ms. The DTC is not validated (stored) if: • the ignition is turned off • first 2 seconds after ignition on • the supply voltage is below 22 volt • the supply voltage is above 32 volt • short circuit on the Spare CAN-bus (separate DTC), except from short circuit between CAN-high and supply voltage
علت
• Defect connectors on DAS for CAN-bus 6 (pin B7 or B16). • Defect wiring for the Spare CAN-bus, open circuit on CAN-high (pin B7) or CAN-low (pin B16). • Ignition signal (pin A1) on DAS is short circuit to supply. • Short circuit between CAN-high and supply voltage. • High busload • Defect ECU unit(s) on the Spare CAN bus. • ECU unit(s) on the CAN-bus communicates with 250 kb/s.
