Toyota RAV4 manuals

Toyota RAV4 Service Manual: Coolant thermostat (coolant temperature below thermostat regulating temperature)

Toyota RAV4 Service Manual / 2Az-fe engine mechanical / Sfi system / Diagnostic trouble code chart / Coolant thermostat (coolant temperature below thermostat regulating temperature)

Toyota RAV4. Coolant thermostat (coolant temperature below thermostat regulating temperature)


Hint:

This dtc relates to the thermostat.

Description

This dtc is set when the engine coolant temperature (ect) does not reach 75°c (167°f) despite sufficient engine warm-up time having elapsed.

Toyota RAV4. Coolant thermostat (coolant temperature below thermostat regulating temperature)


Monitor description

Toyota RAV4. Monitor description


The ecm estimates the ect based on the starting temperature, engine loads, and engine speeds. The ecm then compares the estimated temperature with the actual ect. When the estimated ect reaches 75°c (167°f), the ecm checks the actual ect. If the actual ect is less than 75°c (167°f), the ecm interprets this as a malfunction in the thermostat or the engine cooling system and sets the dtc.

Monitor strategy



Typical enabling conditions

Toyota RAV4. Typical enabling conditions


Typical malfunction thresholds

Toyota RAV4. Typical malfunction thresholds


Inspection procedure

Hint:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  1. Check any other dtcs output (in addition to dtc p0128)

  1. Connect the intelligent tester to the dlc3.
  2. Turn the ignition switch on.
  3. Turn the tester on.
  4. Select the following menu items: diagnosis / enhanced obd ii / dtc info / current codes.
  5. Read dtcs.

Toyota RAV4. Check any other dtcs output (in addition to dtc p0128)


Hint:

If any dtcs other than p0128 are output, troubleshoot those dtcs first.



  1. Check cooling system

  1. Check for defects in the cooling system that might cause the system to be too cold, such as abnormal radiator fan operation or any modifications.



  1. Inspect thermostat

  1. Remove the thermostat (see page co-15).
  2. Measure the valve opening temperature of the thermostat.

Standard value: 80 to 84°c (176 to 183°f)

Hint:

In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

  1. Reinstall the thermostat (see page co-15).

 


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Other materials:

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Description A thermistor, whose resistance value varies according to the ect, is built into the engine coolant temperature (ect) sensor. The structure of the sensor and its connection to the ecm are the same as those of the intake air temperature (iat) sensor. Hint: When any of dtcs ...

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