Toyota RAV4 (XA40) 2013-2018 Service Manual: Pressure sensor circuit
Description
This dtc is output when the refrigerant pressure is either extremely low (0.19 Mpa [2.0 Kgf/cm2, 28 psi] or less) or extremely high (3.14 Mpa [32.0 Kgf/cm2, 455 psi] or more). The air conditioning pressure sensor, which is installed on the pipe of the high pressure side, detects the refrigerant pressure and sends refrigerant pressure signals to the air conditioning amplifier. The air conditioning amplifier determines the pressure from the signals in accordance with the sensor characteristics, and controls the compressor accordingly.
Wiring diagram
Inspection procedure
- Check refrigerant
- Check the sight glass of the cooler unit refrigerant liquid pipe.
- Prepare the vehicle in accordance with the chart
below.
- Compare the sight glass to the following chart.
Hint:
*: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.
- Read value of intelligent tester (reg press sens)
- Connect the intelligent tester (with can vim) to the dlc3.
- Turn the ignition switch on and turn the intelligent tester main switch on.
- Select the item below in the data list, and read the value displayed on the intelligent tester.
Ok: the display is as specified in the normal condition column.
- Check wire harness (pressure sensor - air conditioning amplifier)
- Disconnect the a21 pressure sensor connector.
- Disconnect the e37 amplifier connector.
- Measure the resistance of the wire harness side connectors.
Standard resistance
- Check air conditioning amplifier
- Remove the air conditioning amplifier with its connectors still connected.
- Measure the resistance of the wire harness side connector.
Standard resistance 
- Turn the ignition switch on.
- Measure the voltage of the wire harness side connector.
Standard voltage 
- Inspect air conditioning pressure sensor
- Turn the a/c switch on.
- Disconnect the a21 sensor connector.
- Connect the three 1.5 V dry cell batteries' positive (+)
lead to terminal 3 and the negative (-) lead to terminal 1.
Then connect the voltmeter's positive (+) lead to terminal 2 and the negative (-) lead to terminal 1. Measure the voltage.
Ok: the voltage changes in accordance with the refrigerant pressure as shown in the graph.
Replace air conditioning amplifier
Compressor lock sensor circuit
Description
This sensor sends 1 pulse per engine revolution to the air conditioning
amplifier. If the ratio of the
compressor speed divided by the engine speed is smaller than a predetermined ...
Solar sensor circuit (driver side)
Description
The solar sensor, which is installed on the upper side of the instrument
panel, detects sunlight and
controls the air conditioning auto mode. The output voltage from the solar
se ...
Other materials:
Manual air conditioning system
Air conditioning controls
Fan speed control switch
Temperature control switch
On/off switch
Windshield defogger switch
Rear window and outside rear view mirror defoggers* switch
Airflow mode control switch
Outside/recirculated air mode switch
"A/C" switch
"MAX A/C" switch
*: If equipped
...
Turning on the high beam headlights
With the headlights on, push
the lever away from you to turn
on the high beams.
Pull the lever toward you to the
center position to turn the high
beams off.
Pull the lever toward you and
release it to flash the high
beams once.
You can flash the high beams with
the headlig ...
General maintenance (2006/01- )
Inspect drive belt (see page em-7)
Replace spark plugs (see page ig-7)
Replace air cleaner filter
Remove the air filter.
Visually check that the air filter is not excessively
damaged or oily.
Replace the air filter with a new one, if necessary.
Replace engine oil and oil fil ...
