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OBDII Code List

P1121 2009 TOYOTA PRIUS - Coolant Flow Control Valve Position Sensor Circuit Stuck

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3 What does this mean?

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
  • ECM
What does this mean?

Tech notes

There is a Toyota factory service bulletin for the following Toyota models:

2004-2007 Toyota Prius

User Submitted Video
What does this mean?

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1121 2009 TOYOTA PRIUS Description

The 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.
OBDII Code P1121 2009 Toyota Prius - Coolant Flow Control Valve Position Sensor Circuit Stuck -

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P1121 2009 TOYOTA PRIUS Comments

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Any information is appreciated. Thanks
Repair Importance Level: 3
1=Low 2=Medium 3=High
Repair Difficulty Level: 3
1=Easy 2=Moderate 3=Hard

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