Coolant Pump 1b 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
• Degraded battery cooling performance, reduced available electric torque • Amber warning lamp "Hybrid System Fault" is shown in ICL
System reaction
• Coolant Pump 1b 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 1b has been absent for 200 ms. The DTC is set inactive when Coolant Pump 1b 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