Dtc B1422 Compressor Lock Sensor Circuit

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Heating Air Conditioning. Land Cruiser. Urj200, 202 Grj200 Vdj200

SYSTEM DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

INSPECT MAGNET CLUTCH RELAY (MG CLT)

CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY, AIR CONDITIONING AMPLIFIER AND COOLER COMPRESSOR)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

INSPECT COOLER COMPRESSOR ASSEMBLY

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER COMPRESSOR)

CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)

CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

DTC B1422 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 sends an air conditioning operation request signal to the ECM via direct line, and the ECM sends a magnet clutch operation permission signal to the air conditioning amplifier assembly via direct line.
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 cooler compressor assembly is locked and turns the magnet clutch assembly off.

DTC Code
DTC Detection Condition
Trouble Area
B1422
An open or short in the compressor lock sensor circuit.
  1. Cooler compressor assembly
  2. Harness or connector
  3. Magnet clutch relay (MG CLT)
  4. Air conditioning amplifier assembly
  5. ECM
  6. CAN communication system

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422 Compressor Lock Sensor Circuit


INSPECTION PROCEDURE

HINT:
As DTC B1422 is also output when the fan & generator V-belt is damaged or loose, inspect the belt before performing troubleshooting.
1.CHECK CAN COMMUNICATION SYSTEM

  1. Use the intelligent tester to check if the CAN communication system is functioning normally (Click here).

    Result
    Result
    		Proceed to
    CAN DTC is not output
    		A
    CAN DTC is output (for LHD)
    		B
    CAN DTC is output (for RHD)
    		C


B
GO TO CAN COMMUNICATION SYSTEM (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (Click here)
A


2.INSPECT MAGNET CLUTCH RELAY (MG CLT)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422 Compressor Lock Sensor Circuit

  1. Remove the magnet clutch relay (MG CLT).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3 - 5
    		Battery voltage is not applied to terminals 1 and 2
    		10 kΩ or higher
    Battery voltage is applied to terminals 1 and 2
    		Below 1 Ω


NG
REPLACE MAGNET CLUTCH RELAY (MG CLT)
OK


3.CHECK HARNESS AND CONNECTOR (MAGNET CLUTCH RELAY - BATTERY, AIR CONDITIONING AMPLIFIER AND COOLER COMPRESSOR)

  1. Remove the magnet clutch relay (MG CLT).

  1. Disconnect the E81 air conditioning amplifier assembly connector.

  1. Disconnect the C30 cooler compressor assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    Magnet clutch relay terminal 1 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V
    Magnet clutch relay terminal 5 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Ignition switch off
    		Below 1 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    Magnet clutch relay terminal 2 - E81-20 (MGC)
    		Always
    		Below 1 Ω
    Magnet clutch relay terminal 3 - C30-3 (MG+)
    Magnet clutch relay terminal 1 - Body ground
    		Always
    		10 kΩ or higher
    Magnet clutch relay terminal 2 - Body ground
    Magnet clutch relay terminal 3 - Body ground
    Magnet clutch relay terminal 4 - Body ground


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422 Compressor Lock Sensor Circuit

  1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E81-20 (MGC) - Body ground
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch on (magnet clutch on permitted)
    		Below 1 V
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch off or on (magnet clutch on not permitted)
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (Air Conditioning Amplifier Assembly)


NG
Go to step 7
OK


5.INSPECT COOLER COMPRESSOR ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422 Compressor Lock Sensor Circuit

  1. Remove the cooler compressor assembly.

    1. for 1VD-FTV: Click here.
    2. for 1GR-FE: Click here.

  1. Check the magnet clutch operation.

    OK:
    Measurement Connection
    		Specified Condition
    Battery positive (+) → 3 (MG+)
    Battery negative (-) → cooler compressor assembly body
    		Magnet clutch engages

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (SSR+) - 2 (SSR-)
    		20°C (68°F)
    		160 to 320 Ω
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for 1VD-FTV)
    		B
    NG (for 1GR-FE)
    		C


B
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)

C
REPLACE COOLER COMPRESSOR ASSEMBLY (Click here)
A


6.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - COOLER COMPRESSOR)

  1. Disconnect the E81 air conditioning amplifier assembly connector.

  1. Disconnect the C30 cooler compressor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E81-8 (LOCK) - C30-1 (SSR+)
    		Always
    		Below 1 Ω
    E81-35 (SG-5) - C30-2 (SSR-)
    		Always
    		Below 1 Ω
    E81-8 (LOCK) - Body ground
    		Always
    		10 kΩ or higher
    E81-35 (SG-5) - Body ground
    		Always
    		10 kΩ or higher
    Result
    Result
    		Proceed to
    OK (When troubleshooting according to problem symptoms table)
    		A
    OK (When troubleshooting according to the DTC)
    		B
    NG
    		C


B
REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

C
REPAIR OR REPLACE HARNESS OR CONNECTOR
A

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (Click here)

7.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)

  1. Disconnect the E81 air conditioning amplifier assembly connector.

  1. Disconnect the A38*1 or A52*2 ECM connector.

    1. *1: for LHD
    2. *2: for RHD

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

    Standard Resistance:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    E81-17 (AC1) - A38-30 (AC1)
    		Always
    		Below 1 Ω
    E81-27 (ACT) - A38-18 (ACT)
    		Always
    		Below 1 Ω
    E81-17 (AC1) - Body ground
    		Always
    		10 kΩ or higher
    E81-27 (ACT) - Body ground
    		Always
    		10 kΩ or higher
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    E81-17 (AC1) - A52-30 (AC1)
    		Always
    		Below 1 Ω
    E81-27 (ACT) - A52-18 (ACT)
    		Always
    		Below 1 Ω
    E81-17 (AC1) - Body ground
    		Always
    		10 kΩ or higher
    E81-27 (ACT) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


8.CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System). Dtc B1422 Compressor Lock Sensor Circuit

  1. Remove the air conditioning amplifier assembly with its connectors still connected (Click here).

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E81-17 (AC1) - Body ground
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch on
    		Below 1 V
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch off
    		11 to 14 V
    E81-27 (ACT) - Body ground
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch on (magnet clutch on)
    		Below 1 V
    1. Engine idling
    2. Blower switch LO level
    3. A/C switch off or on (magnet clutch off)
    		11 to 14 V
    Text in Illustration
    *a
    		Component with harness connected
    (Air Conditioning Amplifier Assembly)


NG
Go to step 9
OK

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

9.REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

  1. Temporarily replace the air conditioning amplifier assembly with a new or normally functioning one (Click here).

  1. Check the air conditioning system to check it functions properly.

    OK:
    Air conditioning system functions operate normally.
    Result
    Result
    		Proceed to
    OK
    		A
    NG (for 1GR-FE)
    		B
    NG (for 1VD-FTV)
    		C


B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)
A

END (AIR CONDITIONING AMPLIFIER ASSEMBLY IS FAULTY)