damper LEXUS LS430 2003 Factory User Guide

DTC B1442AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
DTC B1451COMPRESSOR SOLENOID CIRCUIT
DTC B1461EMISSION GAS NOX SENSOR CIRCUIT

Fig. 94: DTC Detection Item Trouble Area Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 95: Air Inlet Damper Position Sensor Circuit

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INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER

a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the items below in the DATA LIST, and read the displays on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TPI - SG)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set RECIRC/FRESH to activate the air inlet servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPI - SG) VOLTAGE
Item
Measure Item/Display
(Range)
Normal ConditionDiagnostic Note
A/I DAMP
POSAir inlet damper position /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100%-
A/I DAMP
TARGAir inlet damper target /
min.: -14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100% HALF-
RECIRCULATION: 43 to 99.5 %-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A37-20 (TPI) - A37-19 (SG)RECIRC3.5 to 4.5 V
A37-20 (TPI) - A37-19 (SG)FRESH0.5 to 1.5 V

a. Remove the air inlet servomotor.
b. Measure the resistance according to the value (s) in the table below.
Standard:
AIR INLET SERVOMOTOR RESISTANCE
c. Measure the resistance according to the value (s) in the table below.
HINT:
SEE DTC B1442 AIR INLET DAMPER CONTROL SERVOMOTOR CIRCUIT
for operation
procedure for the air inlet servomotor.
Standard:
AIR INLET SERVOMOTOR RESISTANCE
HINT:
As the air inlet servomotor moves from fresh to recirculation, the resistance decreases gradually without
interruption.
Tester connectionConditionSpecified condition
A41-1 (VZ) - A41-2 (GND)Always4.2 to 7.8 kohms
Tester connectionConditionSpecified condition
A41-3 (PT) - A41-2 (GND)RECIRCULATION3.4 to 6.2 kohms
A41-3 (PT) - A41-2 (GND)FRESH0.8 to 1.6 kohms

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the position of the cool air bypass servomotor (Max cool damper servomotor) and sends the
appropriate signals to the A/C amplifier. The position sensor is built in the cool air bypass servomotor.

Fig. 99: TPBDR Terminal Voltage/Damper Opening Angle Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 100: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 101: Max Cool Damper Position Sensor Circuit (Driver Side)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TPBDr - SG-7)
a. Remove the A/C amplifier with connectors still connected.
b. Turn the ignition switch to the ON position.
c. Change the set temperature to activate the cool air bypass servomotor.
d. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TPBDr - SG-7) VOLTAGE
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
A/B DAMP
POS-DCool air bypass damper position (Driver
side) / min.: -14% max.: 113.5%OPEN: Approx. 0 % SHUT:
Approx. 100%-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Hot0.5 to 1.8 V
A36-24 (TPBDr) - A36-15 (SG-7)MAX. Cool3.5 to 4.5 V

a. Remove the cool air bypass servomotor.
b. Measure the resistance according to the value (s) in the table below.
Standard:
COOL AIR BYPASS SERVOMOTOR RESISTANCE
c. Measure the resistance according to the value (s) in the table below.
HINT:
SEE COOL AIR BYPASS DAMPER CONTROL SERVOMOTOR CIRCUIT (DRIVER SIDE)
for
operation procedure for the cool air bypass servomotor.
Standard:
COOL AIR BYPASS SERVOMOTOR RESISTANCE
HINT:
As the cool air bypass servomotor moves from the cool side to the hot side, the resistance decreases
gradually without interruption.
Tester connectionConditionSpecified condition
C24-1 (VZ) - C24-2 (GND)Always4.2 to 7.2 kohms
Tester connectionConditionSpecified condition
C24-3 (PT) - C24-2 (GND)Max. Cool3.33 to 4.03 kohms
C24-3 (PT) - C24-2 (GND)Max. Hot0.80 to 1.60 kohms

Fig. 104: Checking Harness And Connector (Cool Air Bypass Servomotor - Air Conditioning
Amplifier)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the position of the cool air bypass servomotor (Max cool damper servomotor) and sends the
appropriate si
gnals to the A/C amplifier. The position sensor is built in the cool air bypass servomotor.

Fig. 105: TPBPR Terminal Voltage/Damper Opening Angle Graph
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 106: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM