Dtc B1422/22 Compressor Lock Sensor Circuit

Heater & Air Conditioning System. Camry. Acv40 Gsv40
Air Conditioning. Camry. Acv40 Gsv40

SYSTEM DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

INSPECT AIR CONDITIONING AMPLIFIER

INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)

CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)

DTC B1422/22 Compressor Lock Sensor Circuit


SYSTEM DESCRIPTION

The ECM sends a signal to the A/C amplifier via CAN communication.
The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor locks, and turns the magnetic clutch off.

DTC No.
DTC Detection Condition
Trouble Area
B1422/22
Open or short in compressor lock sensor circuit
  1. A/C compressor (A/C lock sensor)
  2. Compressor drive belt
  3. Harness or connector between compressor and magnetic clutch (A/C lock sensor)
  4. A/C amplifier
  5. CAN communication system

WIRING DIAGRAM


Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit


INSPECTION PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM

  1. Use the intelligent tester to check if the CAN Communication System is functioning normally.

    Result:
    Result
    		Proceed to
    CAN DTC is not output
    		A
    CAN DTC is output
    		B


B
GO TO CAN COMMUNICATION SYSTEM
A


2.INSPECT AIR CONDITIONING AMPLIFIER


    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Remove the A/C amplifier with the connectors still connected.



    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Measure the waveform of the connector.

    Item
    		Contents
    Tool setting
    		200 mV/DIV., 10 ms./DIV.
    Vehicle condition
    		Engine is running
    A/C switch: ON
    Blower switch: LO
    Standard:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    E38-8 (LOCK) - E38-13 (SG-2)
    		Engine is running
    A/C switch: ON
    Blower switch: LO
    		Pulse generation
    Result:
    Result
    		Proceed to
    NG
    		A
    OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
    		B
    OK (When troubleshooting according to the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


3.INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)


    Camry. Acv40 Gsv40

  1. Disconnect the connector from the A/C compressor.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C53-1 (SSR+) - C53-2 (SSR-)
    		Always (at 20°C (68°F))
    		160 to 320 Ω


NG
REPLACE COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)
OK


4.CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)


    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Disconnect the connector from the A/C amplifier.



    Camry. Acv40 Gsv40.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

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

    Standard resistance:
    Tester Connection (Symbols)
    		Condition
    		Specified Condition
    E38-8 (LOCK) - C53-1 (SSR+)
    		Always
    		Below 1 Ω
    E38-13 (SG-2) - C53-2 (SSR-)
    		Always
    		Below 1 Ω
    E38-8 (LOCK) - Body ground
    		Always
    		10 kΩ or higher
    E38-13 (SG-2) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER