Toyota Tundra. Manual — part 2400

The ECM sends a engine speed signal to the air conditioning amplifier via the CAN communication system.

The air conditioning amplifier reads the difference between compressor speed and engine speed. When the
difference becomes too large, the air conditioning amplifier determines that the compressor locks, and turns the
magnetic clutch off.

DTC DETECTION CONDITION CHART

WIRING DIAGRAM

Fig. 43: Compressor Lock Sensor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

a. Use the Techstream to check if the CAN communication system is functioning normally.

Result

DTC

DTC Detection Condition

Trouble Area

B1422/22

Open or short in compressor lock
sensor circuit



Air conditioning compressor
(lock sensor)



Compressor drive belt
Harness and connector
between air conditioning
compressor (lock sensor) and
air conditioning amplifier



Air conditioning amplifier



CAN communication system

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

RESULT REFERENCE

B: GO TO CAN COMMUNICATION SYSTEM (See PRECAUTION )

A: Go to Next Step

2. CHECK AIR CONDITIONING AMPLIFIER

a. Remove the air conditioning amplifier with the connectors still connected (see REMOVAL ).

Fig. 44: Identifying Terminals Of J19 Air Conditioning Amplifier Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Using an oscilloscope, check the waveform.

Standard

TESTER CONNECTION SPECIFIED CONDITION CHART

Result

RESULT REFERENCE

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

Tester Connection

Tool Setting

Condition

Specified

Condition

J19-8 (LOCK) - J19-13

(SG-2)

200 mV/DIV., 10
ms./DIV.

Engine is running A/C
switch ON
Blower switch LO

Pulse generation

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 45: Identifying Waveform
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE (See PROBLEM SYMPTOMS TABLE )

C: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

A: Go to Next Step

3. INSPECT AIR CONDITIONING COMPRESSOR (LOCK SENSOR)

a. Disconnect the connector from the air conditioning compressor.

Fig. 46: Identifying Terminals Of Air Conditioning Compressor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Resistance

OK (Checking from the DTC)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

TESTER CONNECTION SPECIFIED CONDITION CHART

Result

RESULT REFERENCE

B: REPLACE AIR CONDITIONING COMPRESSOR (LOCK SENSOR) (See REMOVAL )

C: REPLACE AIR CONDITIONING COMPRESSOR (LOCK SENSOR) (See REMOVAL )

A: Go to Next Step

4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - AIR

CONDITIONING COMPRESSOR)

a. Disconnect the J19 air conditioning amplifier connector.

b. Disconnect the D60 air conditioning compressor connector.

Tester Connection Condition Specified Condition

1 (SSR+) - 2 (SSR-) 20°C (68°F)

65 to 125 ohms

Result

Proceed to

OK

A

NG (for 2UZ-FE)

B

NG (for 3UR-FE or 3UR-FBE)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra