Lexus NX: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AIR CONDITIONER PRESSURE SENSOR

(a) Check the wire harness.

*a

Component without harness connected

(Air Conditioner Pressure Sensor)

*b

Component without harness connected

(Air Conditioning Amplifier Assembly)

(1) Disconnect the A18 air conditioner pressure sensor connector.

(2) Disconnect the I50 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

A18-1 (-) - I50-13 (SG-2)

Always

Below 1 Ω

A18-2 (PR) - I50-9 (PRE)

Always

Below 1 Ω

A18-3 (+) - I50-10 (S5-3)

Always

Below 1 Ω

A18-1 (-) - Body ground

Always

10 kΩ or higher

A18-2 (PR) - Body ground

Always

10 kΩ or higher

A18-3 (+) - Body ground

Always

10 kΩ or higher

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

(4) Reconnect the I50 air conditioning amplifier assembly connector.

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

(5) Turn the power switch on (IG).

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

A18-3 (+) - Body ground

Power switch on (IG)

4.75 to 5.25 V

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

(b) Check the air conditioner pressure sensor.

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

(2) Install a manifold gauge set.

(3) Warm up the engine.

(4) Turn the A/C switch on.

(5) 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

I50-9 (PRE) - I50-13 (SG-2)

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 4.71 V

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

*a

Component with harness connected

(Air Conditioning Amplifier Assembly)

READ NEXT:

 Removal

REMOVAL PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM Click here 2. REMOVE AIR CONDITIONER PRESSURE SENSOR (a) Disconnect the connector. (b) Using a 27 mm deep socket

 Installation

INSTALLATION PROCEDURE 1. INSTALL AIR CONDITIONER PRESSURE SENSOR (a) Remove the vinyl tape from the liquid pipe sub-assembly and the connecting part of the air conditioner pressure sensor. (b) Apply

 Air Conditioning System

SEE MORE:

 Inspection

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 Windshield Deicer does not Operate

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