Toyota Tacoma 2015-2018 Service Manual: On-vehicle Inspection

Toyota Tacoma 2015-2018 Service Manual / Air Conditioning / Air Conditioning Pressure Sensor / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT AIR CONDITIONER PRESSURE SENSOR (for Automatic Air Conditioning System)

(a) Check the wire harness.

(1) Disconnect the A34 air conditioner pressure sensor connector.

(2) Disconnect the A35 and A36 air conditioning amplifier assembly connector.

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

Text in Illustration

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)

Front view of wire harness connector

(to Air Conditioner Amplifier Assembly)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A34-1 (-) - A36-28 (SG-8)	Always	Below 1 Ω
A34-2 (PR) - A35-2 (PRE)	Always	Below 1 Ω
A34-3 (+) - A36-12 (S5-1)	Always	Below 1 Ω
A34-1 (-) - Body ground	Always	10 kΩ or higher
A34-2 (PR) - Body ground	Always	10 kΩ or higher
A34-3 (+) - Body ground	Always	10 kΩ or higher

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

(4) Connect the A35 and A36 air conditioning amplifier assembly connector.

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

Text in Illustration

*a	Component without harness connected (to Air Conditioner Pressure Sensor)

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A34-3 (+) - Body ground	IG ON	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) Install a manifold gauge set.

(2) Connect the A34 air conditioner pressure sensor connector.

(3) Warm up the engine.

(4) A/C switch on.

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

Text in Illustration

*a	Component without harness connected (to Air Conditioner Pressure Sensor)

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A35-2 (PRE) - A36-12 (S5-1)

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))

0.63 to 4.72 V

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

2. INSPECT AIR CONDITIONER PRESSURE SENSOR (for Manual Air Conditioning System)

(a) Check the wire harness.

(1) Disconnect the A34 air conditioner pressure sensor connector.

(2) Disconnect the A14 air conditioning amplifier assembly connector.

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

Text in Illustration

Front view of wire harness connector

(to Air Conditioner Pressure Sensor)

Front view of wire harness connector

(to Air Conditioner Amplifier Assembly)

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
A34-1 (-) - A14-33 (SG-1)	Always	Below 1 Ω
A34-2 (PR) - A14-5 (PRE)	Always	Below 1 Ω
A34-3 (+) - A14-8 (S5-1)	Always	Below 1 Ω
A34-1 (-) - Body ground	Always	10 kΩ or higher
A34-2 (PR) - Body ground	Always	10 kΩ or higher
A34- 3(+) - Body ground	Always	10 kΩ or higher

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

(4) Connect the A14 air conditioning amplifier assembly connector.

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

Text in Illustration

*a	Component without harness connected (to Air Conditioner Pressure Sensor)

Standard Voltage:

Tester Connection	Switch Condition	Specified Condition
A34-3 (+) - Body ground	IG ON	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) Install a manifold gauge set.

(2) Connect the A34 air conditioner pressure sensor connector.

(3) Warm up the engine.

(4) A/C switch on.

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

Text in Illustration

*a	Component without harness connected (to Air Conditioner Pressure Sensor)

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A14-5 (PRE) - A14-8 (S5-1)

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))

0.63 to 4.72 V

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

Installation

INSTALLATION PROCEDURE 1. INSTALL AIR CONDITIONER PRESSURE SENSOR (a) Remove the vinyl tape from the air conditioner tube and accessory assembly and connecting part of the air conditioner pressur ...

Removal

REMOVAL PROCEDURE 1. REMOVE REFRIGERANT FROM REFRIGERATION SYSTEM 2. REMOVE AIR CONDITIONER PRESSURE SENSOR (a) Disconnect the connector. ...

Other materials:

Diagnosis System
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Compressor Lock Sensor Circuit (B1422/22)
SYSTEM DESCRIPTION The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication. The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning ampli ...