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Toyota RAV4 Service Manual: Insufficient coolant temperature for closed loop fuel control

Toyota RAV4 Service Manual / 2Az-fe engine mechanical / Sfi system / Diagnostic trouble code chart / Insufficient coolant temperature for closed loop fuel control

Toyota RAV4. Insufficient coolant temperature for closed loop fuel control


Description

Refer to dtc p0115 (see page es-105).

Toyota RAV4. Insufficient coolant temperature for closed loop fuel control


Monitor description

The resistance of the ect sensor varies in proportion to the actual ect. The ect supplies a constant voltage to the sensor and monitors the signal output voltage of the sensor. The signal voltage output varies according to the changing resistance of the sensor. After the engine is started, the ect is monitored through this signal. If the ect sensor indicates that the engine is not yet warm enough for closed-loop fuel control, despite a specified period of time having elapsed since the engine was started, the ecm interprets this as a malfunction in the sensor or cooling system and sets the dtc.

Example: the ect is 0c (32f) at engine start. After about 1 minute running time, the ect sensor still indicates that the engine is not warm enough to begin closed-loop fuel (air-fuel ratio feedback) control. The ecm interprets this as a malfunction in the sensor or cooling system and sets the dtc.

Monitor strategy

Toyota RAV4. Monitor strategy


Typical enabling conditions

Toyota RAV4. Typical enabling conditions


Typical malfunction thresholds

Toyota RAV4. Typical malfunction thresholds


Wiring diagram

Refer to dtc p0115 (see page es-106).

Inspection procedure

Hint:

  1. Check any other dtcs output (in addition to dtc p0125)

  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 p0125)


Hint:

If any dtcs other than p0125 are output, troubleshoot those dtcs first.



  1. Inspect thermostat

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

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

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).


  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.

 


Throttle / pedal position sensor / switch "A" circuit range / performance problem
Hint: This dtc relates to the throttle position (tp) sensor. Description Refer to dtc p0120 (see page es-114). Monitor description The ecm uses the tp sensor to monitor the throttle valve ...

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 75c (167f) despite sufficient engine warm-up time having elap ...

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