Absence of Orange bus CAN communication (CAN1 buffer overflow)
• Check connector for orange CAN bus on ACS (pin A9 and A12). • Check wiring for orange CAN bus: - Measure the resistance (with the battery disconnected) between CAN-high (pin A12) and CAN-low (pin A9). It should be close to 60 ohm (one 120 ohm termination resistor in each end of the CAN bus). - Measure the resistance (with the battery disconnected) between CAN-high on ACS (pin A12) and CAN-high on any other unit on the orange CAN bus (e.g. ACSX). It should be close to zero Ohm. - Measure the resistance (with the battery disconnected) between CAN-low on ACS (pin A9) and CAN-low on any other unit on the orange CAN bus (e.g. ACSX). It should be close to zero Ohm. • Check wiring and connector for the ignition signal (pin A11) on the ACS.
What you'll see
No driver-visible symptom recorded.
System reaction
Red ACS stop lamp Speed & Torque Limitation
Diagnostic depth
Orange CAN bus buffer overflow, which indicates a communication error. The orange CAN bus has an open circuit.
• Defect connectors on ACS, related to the orange CAN bus (pin A9 or A12). • Defect wiring for orange CAN bus, open circuit on CAN high (pin A12) or CAN low (pin A9). • Ignition signal (pin A11) on ACS is short circuit to supply (only ACS is awake on the orange CAN bus). • Short circuit between CAN high and supply voltage. • High busload • Defect ECU unit(s) on the orange CAN bus.