Toyota Tundra. Manual — part 2430

b. When connector terminal 1 is connected to the positive (+) battery terminal, check that the

following occurs: 1) the magnetic clutch's operating sound can be heard, and 2) the magnetic
clutch's hub and rotor lock.

Result

RESULT REFERENCE

Fig. 139: Identifying Terminals Of Magnetic Clutch Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

B: REPLACE MAGNETIC CLUTCH (See REMOVAL )

C: REPLACE MAGNETIC CLUTCH (See REMOVAL )

D: REPLACE MAGNETIC CLUTCH (See REMOVAL )

A: Go to Next Step

8. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - ENGINE

ROOM RELAY BLOCK)

a. Disconnect the D60 air conditioning compressor connector.

Result

Proceed to

OK

A

NG (for 1GR-FE)

B

NG (for 2UZ-FE)

C

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

D

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 140: Identifying Terminals Of D60 Air Conditioning Compressor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Remove the magnetic clutch relay (MG CLT) from the engine room relay block.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)

Tester Connection

Condition

Specified

Condition

D60-3 (MG+) - Engine room relay block magnetic clutch relay
terminal 3

Always

Below 1 ohms

D60-3 (MG+) or Engine room relay block magnetic clutch relay
terminal 3 - Body ground

Always

10 kohms or

higher

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

a. Remove the magnetic clutch relay (MG CLT) from the engine room relay block.

Fig. 141: Identifying Magnetic Clutch Relay (MG CLT)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

ECU POWER SOURCE CIRCUIT

DESCRIPTION

This circuit provides power to operate the air conditioning amplifier.

WIRING DIAGRAM

Tester Connection

Condition

Specified

Condition

Engine room relay block magnetic clutch relay terminal 5 - Body
ground

Always

11 to 14 V

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 142: ECU Power Source - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. INSPECT FUSE (A/C)

a. Remove the A/C fuse from the main body ECU.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

NG: REPLACE FUSE

OK: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY AND

BODY GROUND)

a. Disconnect the J19 air conditioning amplifier connector.

Tester Connection Condition Specified Condition

A/C fuse

Always

Below 1 ohms

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra