B1451

AIR CONDITIONING: AIR CONDITIONING SYSTEM: B1451/51: Compressor Solenoid Circuit

DTC B1451/51 - Compressor Solenoid Circuit

DESCRIPTION

In this circuit, the compressor receives a refrigerant compression demand signal from the air conditioning amplifier.
Based on this signal, the compressor changes the degree of refrigerant compression.






WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT A/C COMPRESSOR





(a) 2GR-FSE
(1) Disconnect the E46 A/C compressor connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:










(b) 1UR-FSE
(1) Disconnect the E1 A/C compressor connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPLACE A/C COMPRESSOR
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - BODY GROUND)





(a) 2GR-FSE
(1) Disconnect the E46 A/C compressor connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:










(b) 1UR-FSE
(1) Disconnect the E1 A/C compressor connector.
(2) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.
3. CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR - A/C AMPLIFIER)





(a) Disconnect the E46 or E1 A/C compressor connector.
(b) Disconnect the K52 A/C amplifier connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard resistance:





HINT:
- *1: 2GR-FSE
- *2: 1UR-FSE

Result:






C -- REPLACE AIR CONDITIONING AMPLIFIER
B -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
A -- REPAIR OR REPLACE HARNESS AND CONNECTOR