Air Conditioning System (for Automatic Air Conditioning System)

HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1422/22: Compressor Lock Sensor Circuit
B1422/22 - Compressor Lock Sensor Circuit

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)

(a) Disconnect the E73 cooler compressor assembly (A/C lock sensor) connector.





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

Standard Resistance:





Text in Illustration





NG -- REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) Removal
OK -- Continue to next step.

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

(a) Disconnect the I77 air conditioning amplifier assembly connector.

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

Standard Resistance:





Result:





B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Automatic Air Conditioning System)

C -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

A -- REPAIR OR REPLACE HARNESS OR CONNECTOR