Coolant pump 1b wrong behavior
• Check that the 24V supply to the pump is the same as the rest of the vehicle supply • Check that CAN integrity is valid. This DTC can be caused due to intermittent CAN disturbances • Check cooling circuit for debris or if the pump is partially clogged • Check that the system is properly bled of air • Check that quality of coolant is acceptable • Replace the pump
What you'll see
• Amber warning lamp "Hybrid System Fault" is shown in ICL • No or reduced cooling of the battery • Reduced available torque to EM
System reaction
• Amber warning lamp "Hybrid System Fault" is shown in ICL • No or reduced cooling of the battery • Reduced available torque to EM
Diagnostic depth
Pump reported speed is compared to the requested pump speed, if they differ too much for too long, DTC is set
• Coolant Pump 1b speed don’t match with the requested speed