Toyota RAV4 manuals

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 0°c (32°f) 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 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).


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

Other materials:

Ecu power source circuit
Description This is the power source for the tire pressure warning ecu. Wiring diagram Inspection procedure Notice: It is necessary to register an id code after replacing the tire pressure monitor valve and/or the tire pressure warning ecu (see page tw-9). Inspect fuse (ecu-ig1) ...

System too
Description The fuel trim is related to the feedback compensation value, not to the basic injection time. The fuel trim consists of both the short-term and the long-term fuel trims. The short-term fuel trim is fuel compensation that is used to constantly maintain the air-fuel ratio at ...

Summary of the blind spot monitor
The blind spot monitor is a system that has 2 functions; The blind spot monitor function Assists the driver in making the decision when changing lanes The rear cross traffic alert function Assists the driver when backing up These functions use same sensors. Bsm main switch ...

© 2011-2019 Copyright www.trav4.net