Heating Air Conditioning. Dtc B1422 Compressor Lock Sensor Circuit

INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

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

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 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	Open or short in the compressor lock sensor circuit.	Cooler compressor assembly (A/C lock sensor) Compressor drive belt Harness or connector Air conditioning amplifier assembly CAN communication system

WIRING DIAGRAM

Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.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 compressor drive belt is damaged or loose, inspect the belt before performing troubleshooting.

1.CHECK CAN COMMUNICATION SYSTEM

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 (for LHD with Entry and Start System)	B
CAN DTC is output (for LHD without Entry and Start System)	C
CAN DTC is output (for RHD with Entry and Start System)	D
CAN DTC is output (for RHD without Entry and Start System)	E

GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0C5X.html)

GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0BYX.html)

GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0BZX.html)

GO TO CAN COMMUNICATION SYSTEM (LandCruiser RM000001RSO0C0X.html)

A

2.INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

for 1GR-FE:
Remove the cooler compressor assembly (A/C lock sensor) (LandCruiser RM00000180106QX.html).

for 1KD-FTV:
Remove the cooler compressor assembly (A/C lock sensor) (LandCruiser RM000000UAV00DX.html).

for 2TR-FE:
Remove the cooler compressor assembly (A/C lock sensor) (LandCruiser RM0000012JZ03VX.html).

for 1GD-FTV:
Remove the cooler compressor assembly (A/C lock sensor) (LandCruiser RM00000180106SX.html).

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 1GR-FE)
B
NG (for 1KD-FTV)
C
NG (for 2TR-FE)
D
NG (for 1GD-FTV)
E

REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) (LandCruiser RM00000180106QX.html)

REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) (LandCruiser RM000000UAV00DX.html)

REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) (LandCruiser RM0000012JZ03VX.html)

REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR) (LandCruiser RM00000180106SX.html)

A

3.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C LOCK SENSOR)

Disconnect the G25 amplifier connector.

Disconnect the C39 sensor connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
G25-8 (LOCK) - C39-1 (SSR+)	Always	Below 1 Ω
G25-13 (SG-2) - C39-2 (SSR-)	Always	Below 1 Ω
G25-8 (LOCK) - Body ground	Always	10 kΩ or higher
G25-13 (SG-2) - 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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (LandCruiser RM0000039R5028X.html)

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000045EC00TX.html)

Result	Proceed to
OK	A
NG (for 1GR-FE)	B
NG (for 1KD-FTV)	C
NG (for 2TR-FE)	D
NG (for 1GD-FTV)	E