Toyota Tundra. Manual — part 2424

Fig. 121: Air Mix Damper Control Servo Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR MIX SERVO MOTOR TARGET PULSE (for

Passenger Side))

a. Use the Data List to check if the servo motor is functioning properly.

Air Conditioner

DATA LIST

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic

Note

Air Mix Servo Targ

Pulse (P)

Passenger side air mix servo motor
target pulse/Min.: 6
Max.: 105

MAX. COLD: 105
(pulse)
MAX. HOT: 6
(pulse)

-

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

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

2. REPLACE AIR MIX SERVO MOTOR (for Passenger Side)

a. Temporarily replace the air mix servo motor with a new one (see DISASSEMBLY ).

HINT:

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo
motor with a new one and check that the condition returns to normal.

3. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: Go to step 4

OK: END (AIR MIX SERVO MOTOR IS DEFECTIVE)

4. REPAIR OR REPLACE AIR CONDITIONING HARNESS

a. Repair or replace the air conditioning harness.

5. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC again (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )

OK: END

DTC B1442/42 AIR INLET DAMPER CONTROL SERVO MOTOR CIRCUIT

DESCRIPTION

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

The air inlet damper servo motor sends pulse signals to inform the air conditioning amplifier of the damper
position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the
air inlet damper to any position, which controls the intake air settings (FRESH, FRESH/RECIRCULATION
and RECIRCULATION).

HINT:

Confirm that no mechanical problem is present because this diagnostic trouble code can be output when either a
damper link or damper is mechanically locked.

DTC DETECTION CONDITION CHART

WIRING DIAGRAM

Fig. 122: Air Inlet Damper Control Servo Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

1. READ VALUE USING TECHSTREAM (AIR INLET DAMPER TARGET PULSE)

a. Use the Data List to check if the servo motor is functioning properly.

Air Conditioner

DATA LIST

DTC

DTC Detection Condition

Trouble Area

B1442/42

Air inlet damper position sensor
value does not change even if air
conditioning amplifier operated
air inlet damper servo motor



Air inlet servo motor



Air conditioning harness



Air conditioning amplifier

Normal

Diagnostic

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra

OK:

The display is as specified in the normal condition.

Result

RESULT REFERENCE

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

2. REPLACE AIR INLET SERVO MOTOR

a. Temporarily replace the air inlet servo motor with a new one (see DISASSEMBLY ).

HINT:

Since the servo motor cannot be inspected while it is removed from the vehicle, replace the servo
motor with a new one and check that the condition returns to normal.

3. CHECK FOR DTC

a. Clear the DTC (see DTC CHECK/CLEAR ).

b. Check for DTC (see DTC CHECK/CLEAR ).

OK:

DTC is not output.

NG: Go to step 4

OK: END (AIR INLET SERVO MOTOR IS DEFECTIVE)

4. REPAIR OR REPLACE AIR CONDITIONING HARNESS

Tester Display

Measurement Item/Range

Condition

Note

Air Inlet Damper Targ

Pulse

Air inlet damper target pulse/Min.:
7
Max.: 28

REC: 7
FRS: 28

-

Result

Proceed to

NG

A

OK (Checking from the PROBLEM SYMPTOMS TABLE)

B

OK (Checking from the DTC)

C

2009 Toyota Tundra

2009 HVAC Air Conditioning - Tundra