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 e36 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 ...
Compressor solenoid circuit (2005/11-2006/01)
Description
In this circuit, the compressor receives a refrigerant compression demand
signal from the air conditioning
amplifier. Based on this signal, the compressor changes the degree of
r ...
Other materials:
Reassembly
Hint:
When installing the ornament plate and emblem, heat the
radiator grille, ornament plate and emblem using a heat light.
Standard heating temperature
Notice:
Do not heat the radiator grille, ornament plate and
emblem excessively.
Install radiator grille emblem
Attach ...
Basic audio operations
Basic audio operations and functions common to each mode are
explained in this section.
Operating the audio system
Press this knob to turn the
audio system on and off, and
turn it to adjust the volume.
Press this button to eject a disc
Insert a disc into the disc slot
Press to pa ...
Passenger side buckle switch circuit malfunction
Description
The passenger side buckle switch circuit consists of the occupant
classification ecu and the front seat
inner belt rh.
Dtc b1771 is recorded when a malfunction is detected in the passenger side
buckle switch circuit.
Troubleshoot dtc b1771 first when dtcs b1771 and b1795 ...
