P1121 2009 TOYOTA PRIUS - Coolant Flow Control Valve Position Sensor Circuit Stuck
P1121 2009 TOYOTA PRIUS Possible Causes
- Coolant Flow Control Valve (Stuck or Clogged Cooling System)
- Faulty Coolant Flow Control Valve Position Sensor
- Coolant Flow Control Valve Position Sensor harness is open or shorted
- Coolant Flow Control Valve Position Sensor circuit poor electrical connection
How do I fix code P1121 2009 TOYOTA PRIUS
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
P1121 2009 TOYOTA PRIUS Tech NotesThere is a Toyota factory service bulletin for the following Toyota models:
2004-2007 Toyota Prius
Toyota Factory Service Bulletin OBDII Code P1121
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Cost of diagnosing the P1121 2009 TOYOTA PRIUS code
Labor: 1.0The cost of diagnosing the P1121 2009 TOYOTA PRIUS code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
P1121 2009 TOYOTA PRIUS Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P1121 2009 TOYOTA PRIUS MeaningThe ECM monitors the position of the water valve based on the valve position signal that is output by the water valve position sensor (potentiometer), which is coupled coaxially to the valve. The water valve effects control in three steps as indicated above, and the ECM determines the position of the valve according to the voltage of the respective step. In order to ensure the proper monitoring of the water valve, the ECM checks for malfunctions with the combination of the output of the potentiometer and CHS tank outlet temperature sensor. If no changes occur in the valve position signal that is being input into the ECM or if the response signal from the water valve is very slow, despite of the ECM commanding the water valve motor to operate the ECM determines that malfunction has occurred in the water valve position sensor circuit, and sets a DTC.
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