Coolant pump 4 wrong behavior
▶ How to fix
• 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
What you'll see
• Amber warning lamp "Hybrid System Fault" is shown in ICL • No cab heating available
System reaction
• Amber warning lamp "Hybrid System Fault" is shown in ICL • Cab heater is not allowed to run
Diagnostic depth
Detection
Pump reported speed is compared to the requested pump speed, if they differ too much for too long, DTC is set
Possible cause
• Coolant Pump 4 speed don’t match with the requested speed