Toyota Tundra. Manual — part 2391

ECM (for 2UZ-FE)

REMOVAL

ECM (for 3UR-FE)

REMOVAL

ECM (for 3UR-FBE)

REMOVAL

Temperature Control: No warm
air comes out

Air mix damper control servo
motor circuit (for Driver Side)

DTC B1446/46 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT (DRIVER

SIDE)

Air mix damper control servo
motor circuit (for Passenger Side)

DTC B1441/41 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT

(PASSENGER SIDE)

Evaporator temperature sensor
circuit

DTC B1413/13 EVAPORATOR

TEMPERATURE SENSOR

CIRCUIT

Room temperature sensor circuit

DTC B1411/11 ROOM

TEMPERATURE SENSOR

CIRCUIT

Ambient temperature sensor
circuit

DTC B1412/12 AMBIENT

TEMPERATURE SENSOR

CIRCUIT

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Temperature Control: Output air
is warmer or cooler than the set
temperature or response is slow

Refrigerant volume

REFRIGERANT

Refrigerant pressure

REFRIGERANT

Solar sensor circuit (for Driver
Side)

DTC B1424/24 SOLAR SENSOR

CIRCUIT (DRIVER SIDE)

Solar sensor circuit (for Passenger
Side)

DTC B1421/21 SOLAR SENSOR

CIRCUIT (PASSENGER SIDE)

Room temperature sensor circuit

DTC B1411/11 ROOM

TEMPERATURE SENSOR

CIRCUIT

Ambient temperature sensor
circuit

DTC B1412/12 AMBIENT

TEMPERATURE SENSOR

CIRCUIT

Air mix damper control servo
motor circuit (for Driver Side)

DTC B1446/46 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT (DRIVER

SIDE)

Air mix damper control serve
motor circuit (for Passenger Side)

DTC B1441/41 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT

(PASSENGER SIDE)

Cool air bypass servo motor
circuit

DTC B1445/45 PASSENGER

SIDE COOL AIR BYPASS

DAMPER CONTROL

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Radiator unit sub-assembly (for
2UZ-FE)

INSPECTION

Radiator unit sub-assembly (for
3UR-FE)

INSPECTION

Radiator unit sub-assembly (for
3UR-FBE)

ON-VEHICLE INSPECTION

Expansion valve

AIR CONDITIONING UNIT

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Temperature Control: No
temperature control (only Max.
cool or Max. warm)

Air mix damper control servo
motor circuit (for Driver Side)

DTC B1446/46 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT (DRIVER

SIDE)

Air mix damper control servo
motor circuit (for Passenger Side)

DTC B1441/41 AIR MIX

DAMPER CONTROL SERVO

MOTOR CIRCUIT

(PASSENGER SIDE)

Room temperature sensor circuit

DTC B1411/11 ROOM

TEMPERATURE SENSOR

CIRCUIT

Ambient temperature sensor
circuit

DTC B1412/12 AMBIENT

TEMPERATURE SENSOR

CIRCUIT

Evaporator temperature sensor
circuit

DTC B1413/13 EVAPORATOR

TEMPERATURE SENSOR

CIRCUIT

Solar sensor circuit (for Driver
Side)

DTC B1424/24 SOLAR SENSOR

CIRCUIT (DRIVER SIDE)

Solar sensor circuit (for Passenger
Side)

DTC B1421/21 SOLAR SENSOR

CIRCUIT (PASSENGER SIDE)

Integration control and panel (for
Column Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR COLUMN

SHIFT TYPE)

Integration control and panel (for
Floor Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR FLOOR

SHIFT TYPE)

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

No air inlet control

Air inlet control servo motor
circuit

DTC B1442/42 AIR INLET

DAMPER CONTROL SERVO

MOTOR CIRCUIT

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Air outlet control servo motor
circuit

DTC B1443/43 AIR OUTLET

DAMPER CONTROL SERVO

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

TERMINALS OF ECU

1. CHECK AIR CONDITIONING AMPLIFIER

No air flow mode control

MOTOR CIRCUIT

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Engine idle up does not occur, or
is continuous

Air conditioning compressor
magnetic clutch circuit

AIR CONDITIONING

COMPRESSOR MAGNETIC

CLUTCH CIRCUIT

Compressor lock sensor circuit

DTC B1422/22 COMPRESSOR

LOCK SENSOR CIRCUIT

LIN communication system

HOW TO PROCEED WITH

TROUBLESHOOTING

Integration control and panel (for
Column Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR COLUMN

SHIFT TYPE)

Integration control and panel (for
Floor Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR FLOOR

SHIFT TYPE)

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

ECM (for 2UZ-FE)

REMOVAL

ECM (for 3UR-FE)

REMOVAL

ECM (for 3UR-FBE)

REMOVAL

Blinking of A/C indicator

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Unable to control A/C with the
steering pad switch

LIN communication system

HOW TO PROCEED WITH

TROUBLESHOOTING

Integration control and panel (for
Column Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR COLUMN

SHIFT TYPE)

Integration control and panel (for
Floor Shift Type)

INTEGRATION CONTROL

AND PANEL (FOR FLOOR

SHIFT TYPE)

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

Diagnostic trouble codes are not
recorded. Set mode is cleared
when ignition switch is turned
OFF.

Air conditioning amplifier

AIR CONDITIONING

AMPLIFIER

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

Fig. 18: Identifying Air Conditioning Amplifier ECU Connector Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

a. Measure the voltage and resistance according to the value(s) in the table below.

HINT:

Check from the rear of the connector with it connected to the air conditioning amplifier.

CONNECTOR TERMINAL REFERENCE

Terminal No.

(Symbols)

Wiring

Color

Terminal Description

Condition

Specified

Condition

J19-1 (IG+) -

J19-14 (GND)

P - W-B

Ignition power supply

Ignition switch ON

11 to 14 V

Ignition switch OFF

Below 1 V

J19-21 (B) -

J19-14 (GND)

R - W-B

Battery power source

Always

11 to 14 V

J19-14 (GND) -

Body ground

W-B -

Body

ground

Ground

Always

Below 1 ohms

J19-5 (TAM) -

J19-14 (GND)

V - W-B

A/C ambient
temperature sensor
signal

Ignition switch ON at 25°
C (77°F)

1.35 to 1.75 V

J19-5 (TAM) -

J19-14 (GND)

V - W-B

A/C ambient
temperature sensor
signal

Ignition switch ON at 40°
C (104°F)

0.9 to 1.2 V

J19-8 (LOCK) -

J19-14 (GND)

SB - W-B

A/C compressor lock
sensor signal

Engine is running Blower
switch LO A/C switch ON

Pulse generation
(see waveform 1

a)

J19-23 (BLW) -

J19-14 (GND)

LG - W-B

Blower motor control
signal

Ignition switch ON
Blower switch LO

Pulse generation
(see waveform 2

b)

J19-20 (MGC) -

J19-14 (GND)

P - W-B

A/C compressor
magnetic clutch
operation signal

Ignition switch ON
Blower switch LO A/C
switch OFF

11 to 14 V

J19-20 (MGC) -

J19-14 (GND)

P - W-B

A/C compressor
magnetic clutch
operation signal

Ignition switch ON
Blower switch LO A/C
switch ON

Below 1 V

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra