Toyota Tundra (2015 year). Manual — part 2279
(b) Disconnect the A20 air conditioning pressure switch connector.
(c) Run the engine at approximately 2000 rpm.
(d) Set the blower speed control switch to the HI position.
(e) Set the temperature control level to the MAX. COOL position.
(f) Turn the A/C switch ON.
(g) Check the switch operation.
(1) Connect the positive (+) lead from an ohmmeter to terminal 1 (+S) and the negative (-) lead to
terminal 2 (-S).
(2) Measure the resistance between the terminals when refrigerant pressure is changed as shown
in the illustration.
OK:
Resistance varies as shown in the illustration.
Result
RESULT
PROCEED TO
NG
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
OK (Checking from the DTC)
C
B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN
PROBLEM SYMPTOMS TABLE
C
REPLACE AIR CONDITIONING AMPLIFIER
A
REPLACE AIR CONDITIONING PRESSURE SWITCH
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
Last Modified: 9-16-2014
6.6 C
Doc ID: RM000002VXK00VX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air Conditioning System): B1441/41; Air
Mix Damper Control Servo Motor Circuit (Passenger Side); 2015 MY Tundra [08/2014 - ]
DTC
B1441/41 Air Mix Damper Control Servo Motor Circuit (Passenger Side)
DESCRIPTION
The No. 1 damper servo sub-assembly (air mix servo motor) sends pulse signals to inform the air conditioning
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
CODE
DTC DETECTION CONDITION
TROUBLE AREA
B1441/41
Air mix damper position sensor value does not change even
if air conditioning amplifier operates No. 1 damper servo
sub-assembly (air mix servo motor)
No. 1 damper servo
sub-assembly (air mix
servo motor)
Air conditioning harness
Air conditioning amplifier
WIRING DIAGRAM
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
A
INSPECTION PROCEDURE
PROCEDURE
1.
READ VALUE USING TECHSTREAM (AIR MIX SERVO MOTOR TARGET PULSE)
(a) Use the Data List to check if the servo motor is functioning properly.
Air Conditioner
TESTER DISPLAY
MEASUREMENT ITEM / RANGE
NORMAL
CONDITION
DIAGNOSTIC
NOTE
Air Mix Servo Targ
Pulse (D)
No. 1 damper servo sub-assembly (air mix servo
motor) target pulse /
Min.: 0, Max.: 255
MAX. COLD: 5
(pulse)
MAX. HOT: 104
(pulse)
-
OK:
The display is as specified in the normal condition.
Result
RESULT
PROCEED TO
OK (Checking from the DTC)
A
OK (Checking from the PROBLEM SYMPTOMS TABLE)
B
NG
C
B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN
PROBLEM SYMPTOMS TABLE
C
REPLACE AIR CONDITIONING AMPLIFIER
2.
REPLACE NO. 1 DAMPER SERVO SUB-ASSEMBLY (AIR MIX SERVO MOTOR)
(a) Temporarily replace the No. 1 damper servo sub-assembly (air mix servo motor) with a new one
.
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.
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
NEXT
NEXT
3.
CHECK FOR DTC
(a) Clear the DTC
.
(b) Check for DTC
.
OK:
DTC is not output.
NG
GO TO STEP 4
OK
END (NO. 1 DAMPER SERVO SUB-ASSEMBLY [AIR
MIX SERVO MOTOR] IS DEFECTIVE)
4.
REPLACE AIR CONDITIONING HARNESS
(a) Replace the air conditioning harness.
5.
CHECK FOR DTC
(a) Clear the DTC
.
(b) Check for DTC again
.
OK:
DTC is not output.
NG
REPLACE AIR CONDITIONING AMPLIFIER
OK
END (AIR CONDITIONING HARNESS IS
DEFECTIVE)
AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Manual Air...
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