Last Modified: 04-05-2023 |
6.11:8.1.0 |
Doc ID: RM100000000VK1M |
Model Year Start: 2016 |
Model: Sienna |
Prod Date Range: [12/2015 - 08/2016] |
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM: Air Conditioning Compressor Magnetic Clutch Circuit; 2016 MY Sienna [12/2015 - 08/2016] |
Air Conditioning Compressor Magnetic Clutch Circuit
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DESCRIPTION
When the air conditioning amplifier is turned on, a magnet clutch ON signal is sent from the MGC terminal of the air conditioning amplifier. Then, the magnet-clutch relay (A/C MG relay) turns on to operate the magnet clutch.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection.
PROCEDURE
1.
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CHECK CAN COMMUNICATION SYSTEM
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Select "Communication Bus Check"
OK:
All ECUs and sensors connected to the CAN communication system are displayed.
OK
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|
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2.
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PERFORM ACTIVE TEST USING TECHSTREAM (MAGNETIC CLUTCH RELAY)
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Body Electrical / Air Conditioner / Active Test.
(e) Check that the relays operate.
Air Conditioner
Tester Display
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Test Part
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Control Range
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Diagnostic Note
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Magnetic Clutch Relay
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A/C compressor
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OFF, ON
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-
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OK:
The magnet clutch operates normally.
OK
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3.
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READ VALUE USING TECHSTREAM (A/C SIGNAL)
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(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Data List.
(e) Check the value(s) by referring to the table below.
Engine
Tester Display
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Measurement Item/Range
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Normal Condition
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Diagnostic Note
|
A/C Signal
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A/C Signal /
ON, OFF
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ON: A/C ON
OFF: A/C OFF
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-
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OK:
The display is as specified in the normal condition.
4.
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INSPECT MAGNET-CLUTCH RELAY (A/C MG RELAY)
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(a) Remove the magnet-clutch relay (A/C MG relay).
(b) Inspect the magnet-clutch relay (A/C MG relay) (See page
).
NG |
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REPLACE MAGNET-CLUTCH RELAY (A/C MG RELAY)
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OK
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5.
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CHECK HARNESS AND CONNECTOR (MGC CIRCUIT)
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(a) Disconnect the air conditioning amplifier connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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D75-20 (MGC) - Body ground
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Always
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11 to 14 V
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Text in Illustration
*a
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Rear view of wire harness connector
(to Air Conditioning Amplifier)
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OK
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|
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6.
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INSPECT AIR CONDITIONING AMPLIFIER (MGC VOLTAGE)
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(a) Remove the air conditioning amplifier with its connectors still connected (See page
).
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Switch Condition
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Specified Condition
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D75-20 (MGC) - Body ground
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Engine running and A/C switch on
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Below 1 V
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Engine running and A/C switch off
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11 to 14 V
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Text in Illustration
*a
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Component with harness connected
(Air Conditioning Amplifier)
|
OK
|
|
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7.
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INSPECT AIR CONDITIONING COMPRESSOR (COMPRESSOR HARNESS)
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(a) Disconnect the air conditioning compressor connector.
(b) Disconnect the magnet clutch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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3 (MG+) - 1
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Always
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Below 1 Ω
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3 (MG+) - Body ground
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Always
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10 kΩ or higher
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Text in Illustration
*a
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Component without harness connected
(Air Conditioning Compressor)
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*b
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Component without harness connected
(Magnet Clutch)
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OK
|
|
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(a) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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1 - Body ground
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Always
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3.4 to 3.8 Ω
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Text in Illustration
*a
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Component without harness connected
(Magnet Clutch)
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|
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(b) When connector terminal 1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the magnet clutch operating sound can be heard, and 2) the magnet clutch hub and rotor lock.
OK
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9.
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CHECK HARNESS AND CONNECTOR (AIR CONDITIONING COMPRESSOR - MAGNET-CLUTCH RELAY)
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(a) Disconnect the B39 air conditioning compressor connector.
(b) Remove the magnet-clutch relay (MG CLT relay).
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection
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Condition
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Specified Condition
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B39-3 (MG+) - A/C MG relay holder 5
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Always
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Below 1 Ω
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B39-3 (MG+) or A/C MG relay holder 5 - Body ground
|
Always
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10 kΩ or higher
|
NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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10.
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CHECK HARNESS AND CONNECTOR (MAGNET-CLUTCH RELAY - BATTERY)
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(a) Remove the magnet-clutch relay (A/C MG relay).
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(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection
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Condition
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Specified Condition
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A/C MG relay holder 1 - Body ground
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Always
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11 to 14 V
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A/C MG relay holder 3 - Body ground
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Always
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11 to 14 V
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Text in Illustration
*1
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Magnet-clutch Relay (A/C MG Relay) Holder
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*a
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Component without relay installed
(Engine Room Relay Block)
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OK |
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REPAIR OR REPLACE HARNESS OR CONNECTOR (AIR CONDITIONING AMPLIFIER - MAGNET-CLUTCH RELAY)
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NG |
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REPAIR OR REPLACE HARNESS OR CONNECTOR
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11.
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REPLACE AIR CONDITIONING AMPLIFIER
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(a) Replace the air conditioning amplifier with a normal one (See page
).
(b) Check that the condition returns to normal.
OK:
Same problem does not occur.
OK |
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END (AIR CONDITIONING AMPLIFIER WAS DEFECTIVE)
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