AIR CONDITIONING SYSTEM (for Automatic 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. 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 E73 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 E73-1 (SSR+) - E73-2 (SSR-) 20°C (68°F) 160 to 320 Ω

   
   

   NG

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

   OK

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

   
   

   1. Disconnect the I77 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 I77-8 (LOCK) - E73-1 (SSR+) Always Below 1 Ω I77-13 (SG-2) - E73-2 (SSR-) Always Below 1 Ω I77-8 (LOCK) - Body ground Always 10 kΩ or higher I77-13 (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