Dtc B1422/22 Compressor Lock Sensor Circuit

Heater & Air Conditioning System. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Air Conditioning. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK AIR CONDITIONING AMPLIFIER (LOCK SIGNAL)

INSPECT COMPRESSOR LOCK SENSOR

CHECK WIRE HARNESS (COMPRESSOR LOCK SENSOR - AIR CONDITIONING AMPLIFIER)

DTC B1422/22 Compressor Lock Sensor Circuit


DESCRIPTION

This sensor sends 1 pulse per engine revolution to the air conditioning amplifier. If the ratio of the compressor speed divided by the engine speed is smaller than a predetermined value, the air conditioning amplifier turns the compressor off, and the indicator blinks at approximately 1 second intervals.

DTC No.
DTC Detection Condition
Trouble Area
B1422/22
Open or short in compressor lock sensor circuit
All conditions below are detected for 3 seconds or more:
1. Engine speed: 450 rpm or more
2. Ratio between engine and compressor speed deviates 20% or more in comparison to normal operation
  1. Compressor and magnetic clutch
  2. Compressor and magnetic clutch drive belt
  3. Compressor lock sensor
  4. Harness and connector between compressor lock sensor and air conditioning amplifier
  5. Air conditioning amplifier

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422/22 Compressor Lock Sensor Circuit


INSPECTION PROCEDURE

1.CHECK AIR CONDITIONING AMPLIFIER (LOCK SIGNAL)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Remove the air conditioning amplifier with its connectors still connected.

  1. Check the waveform of the amplifier connector.

    OK:
    Waveform is as shown in the illustration.
    Item
    		Content
    Tester Connection
    		LOCK (E42-3) - SG-2 (E42-10)
    Tool Setting
    		500 mV/DIV., 20 msec./DIV.
    Condition
    		Ignition switch on (IG)
    A/C switch ON
    Magnetic clutch ON

    Result:

    Result
    		Proceed to
    NG
    		A
    OK (Checking from the PROBLEM SYMPTOMS TABLE)
    		B
    OK (Checking from the DTC)
    		C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE AIR CONDITIONING AMPLIFIER
A


2.INSPECT COMPRESSOR LOCK SENSOR
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Disconnect the B82 compressor lock sensor connector.

  1. Measure the resistance of the sensor.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (SSR+) - 2 (SSR-)
    		20°C (68°F)
    		65 to 125 Ω


NG
REPLACE COMPRESSOR LOCK SENSOR
OK


3.CHECK WIRE HARNESS (COMPRESSOR LOCK SENSOR - AIR CONDITIONING AMPLIFIER)
Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Disconnect the B82 compressor lock sensor connector.

  1. Disconnect the E42 amplifier connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    B82-1 (SSR+) - E42-3 (LOCK)
    		Below 1 Ω
    B82-2 (SSR-) - E42-10 (SG-2)
    		Below 1 Ω
    B82-1 (SSR+) - E42-10 (SG-2)
    		10 kΩ or higher
    E42-3 (LOCK) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE AIR CONDITIONING AMPLIFIER