Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AIR CONDITIONER PRESSURE SENSOR

(a) Check the wire harness.

(1) Disconnect the A15 air conditioner pressure sensor connector.

(2) Disconnect the G36 air conditioning amplifier assembly connector.

(3) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

A15-1 (-) - G36-3 (SG-4)

Always

Below 1 Ω

A15-2 (PR) - G36-24 (PRE)

Always

Below 1 Ω

A15-3 (+) - G36-6 (S5-3)

Always

Below 1 Ω

A15-1 (-) or G36-3 (SG-4) - Other terminals and body ground

Always

10 kΩ or higher

A15-2 (PR) or G36-24 (PRE) - Other terminals and body ground

Always

10 kΩ or higher

A15-3 (+) or G36-6 (S5-3) - Other terminals and body ground

Always

10 kΩ or higher

If the resistance is not as specified, repair or replace the wire harness.

(4) Connect the G36 air conditioning amplifier assembly connector.

(5) Turn the power switch*1 or engine switch*2 to on (IG).

(6) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

*1: for HV Model

*2: for Gasoline Model

A15-3 (+) - Body ground

Power switch on (IG)*1

4.75 to 5.25 V

Engine switch on (IG)*2

If the voltage is not as specified, repair or replace the wire harness or replace the air conditioning amplifier assembly.

(b) Check the air conditioner pressure sensor.

(1) Connect the A15 air conditioner pressure sensor connector.

(2) Install a manifold gauge set.

(3) Turn the A/C switch on.

(4) Measure the voltage according to the value(s) in the table below.

HINT:

Check from the rear of the connector while it is connected to the air conditioning amplifier assembly.

Standard Voltage:

Tester Connection

Condition

Specified Condition

G36-24 (PRE) - G36-3 (SG-4)

Refrigerant pressure: Normal pressure (less than 3025 kPa (30.8 kgf/cm2, 439 psi) and more than 176 kPa (1.8 kgf/cm2, 26 psi))

0.74 to 4.61 V

If the voltage is not as specified, replace the air conditioner pressure sensor.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

    Installation

    Removal

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