Air Conditioning Compressor Magnetic Clutch Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body / Main body / Date List.
5. Check the value(s) by referring to the table below.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   A/C SW Input	A/C switch status / ON or OFF	ON: A/C switch on OFF: A/C switch off	-

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   5 

A: Go to next step 

Fig 1: D21 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the voltage according to the valve(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   D21-2(B) - Body ground	Ignition switch on Blower switch: on	10 to 16 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component with Component with harness connected (No. 3 heater control sub-assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the No. 3 heater control sub-assembly. Refer to DISASSEMBLY [03/2012 - 05/2013] - Step 4 .
2. Inspect the No. 3 heater control sub-assembly. Refer to INSPECTION [03/2012 - 05/2013] - Step 3 .

NG → See step   19 

OK: Go to next step 

1. Disconnect the D21 No. 3 heater control sub-assembly connector.
2. Disconnect the D6 main body ECU (network gateway ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D6-17 - D21-3(A/C)	Always	Below 1 Ω
   D6-17 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU) 

1. Enter the following menus: Powertrain / Engine and ETC / Date List.
2. Check the value(s) by referring to the table below.
   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   A/C Pressure Normal SW	Pressure Switch status / ON or OFF	ON: A/C on OFF: A/C off	-

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK	B

B → See step   12 

A: Go to next step 

1. Check the refrigerant volume. Refer to ON-VEHICLE INSPECTION [03/2012 - 05/2013] - Step 1

NG → CHARGE REFRIGERANT 

OK: Go to next step 

Fig 2: A7 Air Conditioning Tube And Accessory Assembly Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A7 air conditioning tube and accessory assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A7-4(B) - Body ground	Ignition switch on	10 to 16 V

   TEXT IN ILLUSTRATION
   
   

   *1	Component without Component with harness connected (Air conditioning tube and accessory assembly)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A7-2(E) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 3: Heater Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the heater relay from the engine room relay block and junction block.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2 - A7-1(AC)	Always	Below 1 Ω
   2 - Body ground	Always	10kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without relay installed (Engine Room Relay Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the A33 ECM connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A7-3(ACP) - A33-8(ACP)	Always	Below 1 Ω
   A7-3(ACP) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the air conditioning tube and accessory assembly. Refer to ON-VEHICLE INSPECTION [03/2012 - ] - Step 1

NG → REPLACE AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY 

OK → REPLACE ECM 

1. Enter the following menus: Powertrain / Engine and ETC / Date List.
2. Check the value(s) by referring to the table below.
   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   A/C Signal	A/C switch status / ON or OFF	ON: A/C switch on OFF: A/C switch off	The air conditioning control assembly sends the A/C switch signal to the ECM via CAN communication.

   OK

   The display is as specified in the normal condition column.

B → See step   16 

A: Go to next step 

1. Remove the heater relay from the engine room relay block and junction block.
2. Inspect the heater relay. Refer to ON-VEHICLE INSPECTION [03/2012 - ] - Step 1 .

NG → REPLACE HEATER RELAY 

OK: Go to next step 

Fig 4: Heater Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   5 - Body ground	Ignition switch off	Below 1 V
   	Ignition switch on	10 to 16V

   TEXT IN ILLUSTRATION
   
   

   *1	Component without relay installed (Engine Room Relay Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 5: Heater Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A35 ECM connector.
2. Measure the resistance according to the valve(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   1 - A35-35(AC)	Always	Below 1 Ω
   1 - Body ground	Always	10kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without relay installed (Engine Room Relay Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

Fig 6: Heater Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C17-1(MG+) - 3	Always	Below 1 Ω
   C17-1(MG+) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Component without relay installed (Engine Room Relay Block)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Inspect the compressor with magnet clutch. Refer to INSPECTION [03/2012 - ] - Step 1 .

NG → See step   18 

OK → REPLACE ECM