2007 TOYOTA SIENNA Ac compressor

AC–62AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
OK
(a) Use a refrigerant recovery unit to recover refrigerant.
(b) Evacuate the A/C system.
(c) Add an appropriate amount of refrigerant (See page AC-
173).
HINT:
If refrigerant is added and the system has not been
properly evacuated (insufficient vacuum time), moisture
in the air remaining in the system will freeze in the
expansion valve, blocking the flow on the high pressure
side. Therefore, in order to confirm the problem, recover
the refrigerant and properly evacuate the system. Add an
appropriate amount of refrigerant, and check for the
DTC.
NEXT
(a) Recheck for the DTC when the following conditions are
satisfied.
NOTICE:
If refrigerant pressure on the high pressure side
becomes high, the DTC will be set. It is necessary to
measure the voltage for a certain amount of time
(approximately 10 minutes) because the DTC may be
set after the A/C operates for a while.
HINT:
• When the outside air temperature is low (below -1.5
C
(29.3
F)), the compressor stops due to operation of
the ambient temperature sensor and the evaporator
temperature sensor to prevent the evaporator from
freezing. In this case, perform the inspection in a
warm indoor environment.
14CHARGE REFRIGERANT
15RECHECK DTC
Item Condition
Vehicle Doors Fully open
Temperature Setting MAX COLD
Blower Speed HI
A/C Switch ON
R/F Switch RECIRCULATION
Interior Temperature 25 to 35
C (77 to 95F)
Engine Speed 2000 rpm

AC–64AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
NOTICE:
If refrigerant pressure on the high pressure side
becomes high, the DTC will be set. It is necessary to
measure the voltage for a certain amount of time
(approximately 10 minutes) because the DTC may be
set after the A/C operates for a while.
HINT:
• When the outside air temperature is low (below -1.5
C
(29.3
F)), the compressor stops due to operation of
the ambient temperature sensor and the evaporator
temperature sensor to prevent the evaporator from
freezing. In this case, perform the inspection in a
warm indoor environment.
• If refrigerant pressure is not normal after replacing the
expansion valve with a normal one, the condenser or
pipes may be clogged due to dirt, dust or other
contaminant. In this case, clean or replace the
condenser or pipes.
Result
B
A
Result Proceed to
DTC B1423 is not output A
DTC B1423 is output B
REPLACE CONDENSER
END

AC–124AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
DESCRIPTION
In this circuit, the compressor receives a refrigerant compression demand signal from the A/C amplifier.
Based on this signal, the compressor changes the amount of compressor output.
WIRING DIAGRAM
DTC B1451/51 Compressor Solenoid Circuit
DTC No. DTC Detection Condition Trouble Area
B1451/51Open or short in solenoid of externally changeable
compressor circuit• A/C compressor
• Harness or connector between A/C amplifier and
solenoid of externally changeable compressor
• A/C amplifier
E116880E08

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–125
AC
INSPECTION PROCEDURE
(a) Disconnect the A/C compressor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
(a) Disconnect the A/C compressor connector.
(b) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
OK
1INSPECT A/C COMPRESSOR
E116970E11
Tester Connection Condition Specified Condition
A32-2 (SOL+) - A32-1
(SOL-)20
C (68F) 10 to 11
REPLACE A/C COMPRESSOR
2CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - BODY GROUND)
E116971E16
Tester Connection Condition Specified Condition
A32-1 (SOL-) - Body
groundAlways Below 1
REPAIR OR REPLACE HARNESS OR
CONNECTOR

AC–126AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Disconnect the A/C compressor connector.
(b) Disconnect the A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
Result
B
C
A
3CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - A/C AMPLIFIER)
E116971E17
E143742E43
Tester Connection Condition Specified Condition
A9-4 (SOL+) - A32-2
(SOL+)Always Below 1
A9-4 (SOL+) - Body
groundAlways 10 k or higher
Result Proceed to
NG A
OK (When troubleshooting according to the
PROBLEM SYMPTOMS TABLE)B
OK (When troubleshooting according to the DTC) C
PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEM SYMPTOMS TABLE
REPLACE A/C AMPLIFIER
REPAIR OR REPLACE HARNESS OR CONNECTOR

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–135
AC
DESCRIPTION
When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/
C amplifier. Then, the MG CLT relay turns on to operate the magnetic clutch.
WIRING DIAGRAM
INSPECTION PROCEDURE
(a) Use the intelligent tester to check if the CAN
communication system is functioning normally.
Result
Air Conditioning Compressor Magnetic Clutch Circuit
1CHECK CAN COMMUNICATION SYSTEM
E124490E08
Result Proceed to
CAN DTC is not output A
CAN DTC is output B

AC–138AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)
AC
(a) Reconnect the connector to the A/C amplifier.
(b) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
(a) Disconnect the connector from the compressor and
magnetic clutch.
(b) Disconnect the connector from the magnetic clutch.
(c) Measure the resistance according to the value(s) in the
table below.
Standard resistance
NG
7INSPECT A/C AMPLIFIER
E147476E02
Tester Connection Condition Specified Condition
A9-5 (MGC) - Body
groundIgnition switch: ON
A/C switch: OFF11 to 14 V
A9-5 (MGC) - Body
groundIgnition switch: ON
A/C switch: ONBelow 1 V
REPLACE A/C AMPLIFIER
8INSPECT COMPRESSOR AND MAGNETIC CLUTCH
E145186E02
E124482E04
Tester Connection Condition Specified Condition
A32-3 (MG+) - A-1 Always Below 1
A32-3 (MG+) - Body
groundAlways 10 k or higher
REPLACE COMPRESSOR AND MAGNETIC
CLUTCH

AIR CONDITIONING – AIR CONDITIONING SYSTEM (for Automatic Air Conditioning Sys-
tem)AC–139
AC
OK
(a) Measure the resistance according to the value(s) in the
table below.
Standard resistance
(b) When connector terminal A1 is connected to the positive
(+) battery terminal, check that the following occurs: 1)
the magnetic clutch's operating sound can be heard, and
2) the magnetic clutch's hub and rotor lock.
NG
OK
(a) Remove the MG CLT relay from the No. 3 relay block.
(b) Turn the ignition switch to the ON position.
(c) Measure the voltage according to the value(s) in the
table below.
Standard voltage
NG
OK
9INSPECT MAGNETIC CLUTCH
E147609E01
Tester Connection Condition Specified Condition
A-1 - Body ground Always 3.4 to 3.8
REPLACE MAGNETIC CLUTCH
10CHECK HARNESS AND CONNECTOR (NO. 3 RELAY BLOCK - BATTERY)
E147378E01
Tester Connection Specified Condition
Relay block MG CLT relay terminal 5 - Body ground 11 to 14 V
Relay block MG CLT relay terminal 1 - Body ground 11 to 14 V
REPAIR OR REPLACE HARNESS OR
CONNECTOR (NO. 3 RELAY BLOCK -
COMPRESSOR AND MAGNETIC CLUTCH)
REPAIR OR REPLACE HARNESS OR CONNECTOR