DTC B1451/51: Compressor Solenoid Circuit: Procedure

1. Connect Techstream to the DLC3.
2. Turn the ignition switch on (IG) and turn Techstream main switch on.
3. Select the items below in the Data List, and read the value displayed on Techstream.
   DATA LIST / AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Regulator Control Current	Regulator control current / Min.: 0 A Max.: 0.997 A	Value changes between 0 A and 0.997 A in accordance with compressor operation	-

   OK

   The display is as specified in the normal condition column.

   Result

   Result	Proceed to
   NG	A
   OK (Checking from PROBLEM SYMPTOMS TABLE)	B
   OK (Checking from DTC)	C

B → See step   9 

C → See step   10 

A: Go to next step 

Result

B → See step   6 

A: Go to next step 

1. Disconnect the compressor and magnetic clutch connector.
   Fig 1: Checking Compressor And Magnetic Clutch

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B65-2 (SOL+) - B65-1 (SOL-)	25°C (77°F)	10.1 to 11.1 Ω

NG → See step   11 

OK: Go to next step 

1. Disconnect the B65 compressor and magnetic clutch connector.
   Fig 2: Checking Harness And Connector (Compressor And Magnetic Clutch - Air Conditioning Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 3: Measuring Resistance Of D37 Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the D37 amplifier connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B65-2 (SOL+) - D37-2 (SOL+)	Always	Below 1 Ω
   B65-2 (SOL+) - Body Ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the B65 compressor and magnetic clutch connector.
   Fig 4: Checking Harness And Connector (Compressor And Magnetic Clutch - Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B65-1 (SOL-) - Body Ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Disconnect the compressor assembly with pulley connector.
   Fig 5: Inspecting Compressor Assembly With Pulley

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B65-2 (SOL+) - B65-1 (SOL-)	25°C (77°F)	10.1 to 11.1 Ω

NG → See step   12 

OK: Go to next step 

1. Disconnect the compressor assembly with pulley connector.
   Fig 6: Checking Harness And Connector (Compressor Assembly With Pulley - A/C Amplifier)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A/C amplifier connector.
   Fig 7: Measuring Resistance Of A/C Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   D37-2 (SOL+) - B65-2 (SOL+)	Always	Below 1 Ω
   D37-2 (SOL+) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the compressor assembly with pulley connector.
   Fig 8: Checking Harness And Connector (Compressor Assembly With Pulley - Body Ground)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   B65-1 (SOL-) - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10