AIR CONDITIONING SYSTEM, Diagnostic DTC:B1422/22

SYSTEM DESCRIPTION

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnetic clutch off.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. PERFORM ACTIVE TEST USING GTS

   
   
   1. 

      Text in Illustration

      *a	Front view of wire harness connector (to Magnetic Clutch Assembly)

      Disconnect the a2 magnetic clutch assembly connector.

   2. Install SST to the connector on the magnetic clutch relay side.

      SST

      09843-18040

   3. Connect the GTS to the DLC3.

   4. Start the engine.

   5. Turn the GTS on.

   6. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

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

      Note

      Take care that the connector or measurement tools do not contact the rotating parts of the engine.

      Air Conditioner

      Tester Display	Test Part	Control Range	Diagnostic Note
      Magnetic Clutch Relay	A/C system operation	OFF, ON	-

      Standard Voltage
      Tester Connection Condition Specified Condition a2 - Body ground Engine is running Active Test above is being performed 11 to 14 V

      Tech Tips

      When performing the Active Test, voltage between 11 and 14 V is output for approximately 3 seconds.

   
   

   NG

   GO TO AIR CONDITIONING COMPRESSOR MAGNETIC CLUTCH CIRCUIT Click here

   OK

2. INSPECT MAGNET CLUTCH ASSEMBLY

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Magnetic Clutch Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition a2-1 - Body ground 20°C (68°F) 3.8 to 4.2 Ω

   2. When connector terminal a2-1 is connected to a positive (+) battery terminal, check that the following occurs: 1) the magnetic clutch operating sound can be heard, and 2) the magnetic clutch hub and rotor lock.

   
   

   NG

   REPLACE MAGNET CLUTCH ASSEMBLY Click here

   OK

3. INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

   
   
   1. 

      Text in Illustration

      *a	Component without harness connected (Cooler Compressor Assembly (A/C Lock Sensor))

      Disconnect the D65 cooler compressor assembly (A/C lock sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition 1 (SSR+) - 2 (SSR-) 20°C (68°F) 160 to 320 Ω

   
   

   NG

   REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) Click here

   OK

4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR))

   
   

   1. Disconnect the H54 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition H54-8 (LOCK) - D65-1 (SSR+) Always Below 1 Ω H54-13 (SG-2) - D65-2 (SSR-) Always Below 1 Ω H54-8 (LOCK) - Body ground Always 10 kΩ or higher H54-13 (SG-2) - Body ground Always 10 kΩ or higher

      Result
      Result Proceed to NG A OK (When troubleshooting according to Problem Symptoms Table) B OK (When troubleshooting according to the DTC) C

   
   

   B

   PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

   C

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

   A

   REPAIR OR REPLACE HARNESS OR CONNECTOR