DTC P0C73-776: Motor Electronics Coolant Pump "A" Control Performance [08/2013 - ]: Description

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

The inverter water pump assembly transmits rotation revolution speed information to the power management control ECU. The power management control ECU monitors the revolution speed and detects malfunctions.

DTC No.	INF Code	DTC Detection Condition	Trouble Area
P0C73	776	The inverter water pump assembly revolution speed is abnormally high or low (or stop) for 1 minute or more or the inverter water pump assembly stops intermittently after abnormal revolution speed is detected. (1 trip detection logic)	Inverter cooling system Wire harness or connector Inverter water pump assembly Power management control ECU

HINT:

The inverter water pump assembly operates when the power switch is on (READY).

RELATED DATA LIST

DTC No.	Data List Item
P0C73-776	Inverter Coolant Water Temperature W/P Run Control Duty*1 Inverter W/P Revolution Ready Signal

*1: This Data List item is related to the inverter water pump assembly.

RELATED ACTIVE TEST

DTC No.	Active Test
P0C73-776	Activate the Water Pump*2

*2: This is an Active Test of the inverter water pump assembly.