Engine-Codes - Toyota - P1150 2004 TOYOTA PRIUS

P1150 2004 TOYOTA PRIUS - Coolant Path Clog of Coolant Heat Storage System

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P1150 2004 TOYOTA PRIUS Possible Causes

  • Coolant heat storage tank outlet temperature sensor
  • Water valve (coolant flow control valve)
  • Cooling system (clogging)
  • Engine Control Module (ECM)

How is the P1150 2004 TOYOTA PRIUS code repair?

Start by checking 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.

What is the cost to diagnose the P1150 2004 TOYOTA PRIUS code

Labor: 1.0

The cost to diagnose the P1150 2004 TOYOTA PRIUS code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.
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Possible Symptoms

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

P1150 2004 TOYOTA PRIUS Meaning

This system uses an electric pump to supply hot coolant stored in the coolant heat storage (CHS) 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 CHS 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 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 the 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.

More Information

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