Toyota Tundra. Manual — part 2404
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
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
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
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
Fig. 59: 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
OK:
The display is as specified in the normal condition.
Result
RESULT REFERENCE
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
Tester Display
Measurement Item/Range
Normal
Condition
Diagnostic
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
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
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 B1443/43 AIR OUTLET DAMPER CONTROL SERVO MOTOR CIRCUIT
DESCRIPTION
The mode damper servo motor sends pulse signals to inform the air conditioning amplifier of the damper
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
position. The air conditioning amplifier activates the motor (normal, reverse) based on the signals to move the
air outlet damper to any position, which controls the air outlet switching.
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. 60: Air Outlet Damper Control Servo Motor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1. READ VALUE USING TECHSTREAM (AIR OUTLET SERVO MOTOR 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
B1443/43
Air outlet damper position sensor
value does not change even if air
conditioning amplifier operates air
outlet servo motor
Air outlet servo motor
Air conditioning harness
Air conditioning amplifier
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic
Note
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
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