Coolant pump 4 CAN node timeout
• Verify power supply to pump (cables and fuse) • Verify CAN bus integrity between pump and BMU6 • Change coolant pump. If other pump related fault codes, verify that cooling circuit is free of debris
What you'll see
• No cab heating • Amber warning lamp "Hybrid System Fault" is shown in ICL
System reaction
• Coolant Pump 4 runs for 100% or at 0% • Degraded battery cooling performance, reduced available electric torque • Amber warning lamp "Hybrid System Fault" is shown in ICL
Diagnostic depth
The DTC is set active if CAN message from the Coolant Pump 4 has been absent for 200 ms. The DTC is set inactive when Coolant Pump 4 CAN message is received. The DTC is not set in the following cases: • ignition is turned off • first 2 seconds after ignition on • system voltage is below 22 volt • system voltage is above 32 volt • short circuit or open circuit on the RES CAN bus (separate DTCs)
• Bad connection to the pump • Pump disconnected from the RES CAN-bus • Pump is faulty