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P1120 Toyota Code - Coolant Flow Control Valve Position Sensor Circuit

Quick Answer

This system uses an electric pump to supply hot coolant stored in the heat storage tank into the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of unburned gas that is discharged while the engine is started. Common causes include Coolant Flow Control Valve, Faulty Coolant Flow Control Valve Position Sensor, Coolant Flow Control Valve Position Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1120 Toyota indicates Coolant Flow Control Valve Position Sensor Circuit.
Common causes
Common causes include Coolant Flow Control Valve, Faulty Coolant Flow Control Valve Position Sensor, Coolant Flow Control Valve Position Sensor harness is open or shorted.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 18,570
How popular is this code, among other codes? Low
What is this?
Table of contents Created and updated by William Orellana on Dec 10, 2021
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Code P1120 Toyota Description

This system uses an electric pump to supply hot coolant stored in the heat storage tank into the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of unburned gas that is discharged while the engine is started. Before the engine starts, the Engine Control Module (ECM) operates the electric water pump to direct the hot coolant in the heat storage tank into the engine, in order to heat the cylinder head (this process is called preheat mode). The duration of the operation of the electric water pump is variable, depending on the temperature of the cylinder head. During the normal operation of the engine, the water valve opens the passage between the cylinder head and the heater and closes the passage between the cylinder head and the tank. During preheat mode in which the cylinder head is heated, the water valve opens the passage between the tank and the cylinder head, in order to allow the coolant to flow from the tank to the cylinder head. At this time, in order to warm up the intake port quickly before the engine is started, the coolant flows in the reverse direction.
The water valve for the Coolant Heat Storage (CHS) system, which is located at the heater hoses, controls the coolant passages to the engine, heater core, and the CHS tank in accordance with the operating conditions of the system.
The water valve consists of a water valve, valve position sensor, and valve control motor. The potentiometer, which is coupled coaxially to the water valve, converts the valve position into voltage and transmits it to the ECM in the form of a position signal.
OBDII Code P1120 Toyota - Coolant Flow Control Valve Position Sensor Circuit - AutoCodes.com
P1120 Toyota Code - Coolant Flow Control Valve Position Sensor Circuit
What does this mean?

What are the Possible Causes of the DTC P1120 Toyota?

  • Coolant Flow Control Valve
  • 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
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P1120 Toyota?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

For Non-Hybrid Toyota Vehicles P1120 = Accelerator Pedal Position Sensor Circuit Malfunction. See: P1120 Toyota

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1120 Toyota code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1120 Toyota code?

Need more information on how to fix the P1120 Toyota code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1120 Toyota code diagnosed by a professional: Find a repair shop in your area

Information for Specific Toyota Models

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1120 Toyota Code

1. What are the common symptoms of OBDII code P1120 in a Toyota related to the Coolant Flow Control Valve Position Sensor Circuit?

The common symptoms include engine overheating, a decrease in fuel efficiency, and potential stalling or rough idling.

2. What are the possible causes of the OBDII code P1120 in a Toyota?

Possible causes include a faulty coolant flow control valve, a malfunctioning sensor circuit, wiring issues, or a problem with the engine control module (ECM).

3. How can I diagnose the OBDII code P1120 related to the Coolant Flow Control Valve Position Sensor Circuit in my Toyota?

You can diagnose the issue using a diagnostic scanner to read the code, checking the coolant flow control valve and sensor for proper operation, and inspecting the wiring for any damage or loose connections.

4. Can I still drive my Toyota with the OBDII code P1120 present?

It is not recommended to drive your Toyota with the P1120 code present, as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

5. How can I repair the OBDII code P1120 in my Toyota related to the Coolant Flow Control Valve Position Sensor Circuit?

Repair options include replacing the faulty coolant flow control valve, repairing or replacing the sensor circuit, fixing any wiring issues, or resetting the ECM after fixing the problem.

6. Will resetting the OBDII code P1120 in my Toyota make the issue go away permanently?

Resetting the code may temporarily remove the warning light, but if the underlying issue causing the code is not addressed, it is likely to reappear.

7. Is it possible to prevent the OBDII code P1120 from occurring in my Toyota?

Regular maintenance, such as checking and replacing coolant as needed, inspecting the coolant flow control valve and sensor, and ensuring proper wiring connections, can help prevent the code from appearing.

8. Can a DIY enthusiast repair the OBDII code P1120 issue in a Toyota themselves?

Depending on your skill level and access to tools, you may be able to address the issue yourself by following repair guides and tutorials. However, professional assistance may be needed for more complex repairs.

9. How long does it typically take to repair the OBDII code P1120 in a Toyota?

The repair time can vary based on the exact cause of the issue, but it can generally take anywhere from a few hours to a full day to diagnose and fix the problem.

10. Are there any recalls or service bulletins related to the OBDII code P1120 in Toyota vehicles?

It's recommended to check with Toyota dealerships or online resources to see if there are any recalls or service bulletins related to the P1120 code for your specific Toyota model.

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