CUSTOMER CONCERN The engine control module stores DTC P2681-15 for the coolant-flow control circuit. CAUSE The confirmed repair identified a failed coolant flow control valve; Toyota's updated valve was specified for the condition. CORRECTION Remove and replace the failed coolant flow control valve with the updated Toyota unit, clear DTC P2681-15, and verify coolant-flow control operation.

CUSTOMER CONCERN Warning lights come on intermittently and DTC P261B sets because engine water-pump speed is below the commanded value. CAUSE A defective aftermarket electric engine water pump could not maintain the commanded pump speed. CORRECTION Remove and replace the defective aftermarket electric water pump with an OEM-quality pump, clear DTC P261B, and verify commanded and actual pump speed remain consistent.