Toyota Tundra. Manual — part 2401
Fig. 47: Identifying Terminals Of D60 Air Conditioning Compressor Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHART
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (See REMOVAL )
DTC B1423/23 PRESSURE SENSOR CIRCUIT
DESCRIPTION
Tester Connection
Condition Specified Condition
J19-8 (LOCK) - D60-1 (SSR+)
Always
Below 1 ohms
J19-13 (SG-2) - D60-2 (SSR-)
J19-8 (LOCK) or D60-1 (SSR+) - Body ground
Always
10 kohms or higher
J19-13 (SG-2) or D60-2 (SSR-) - Body ground
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
This DTC is output when refrigerant pressure is extremely low (196 kPa (2.0 kgf/cm
2
, 28 psi) or less) or
extremely high (3140 kPa (32.0 kgf/cm
2
, 455 psi) or more). The pressure switch, which is installed on the pipe
of the high pressure side to detect refrigerant pressure, outputs a refrigerant pressure signal to the air
conditioning amplifier.
The air conditioning amplifier controls the compressor according to the sensor characteristic.
HINT:
Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if
there is no refrigerant in the system.
DTC DETECTION CONDITION CHART
WIRING DIAGRAM
Fig. 48: Pressure Sensor - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
HINT:
Be sure to check the refrigerant volume first when this DTC is output because this DTC can also be output if
DTC
DTC Detection Condition
Trouble Area
B1423/23
Open or short in pressure switch
circuit
Air conditioning pressure
switch
Harness and connector
Air conditioning amplifier
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
there is no refrigerant in the system.
1. CHECK HARNESS OR CONNECTOR (A/C PRESSURE SWITCH - A/C AMPLIFIER AND
BODY GROUND)
a. Disconnect the A20 air conditioning pressure switch connector.
Fig. 49: Identifying Terminals Of A20 Air Conditioning Pressure Switch Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Disconnect the J19 air conditioning amplifier connector.
c. Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHART
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to Next Step
2. CHECK AIR CONDITIONING PRESSURE SWITCH
a. Set the manifold gauge set.
Tester Connection
Condition Specified Condition
A20-1 - J19-9 (PSW)
Always
Below 1 ohms
A20-1 or J19-9 (PSW) - Body ground Always
10 kohms or higher
A20-2 - Body ground
Always
Below 1 ohms
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
b. Disconnect the air conditioning pressure switch connector.
Fig. 50: Locating Air Conditioning Pressure Switch Connector
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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 and the negative (-) lead to
terminal 2.
2. Measure the resistance between the terminals when refrigerant pressure is changed, as shown
in the illustration.
Fig. 51: Air Conditioning Pressure Switch Continuity Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK:
Resistance varies as shown in the illustration.
Result
2009 Toyota Tundra
2009 HVAC Air Conditioning - Tundra
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