Dtc B1422/22 Compressor Lock Sensor Circuit

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING

SYSTEM DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

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

DTC B1422/22 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 compressor is locked, and turns the magnetic clutch off.

DTC CodeDTC Detection ConditionTrouble AreaB1422/22 An open or short in the compressor lock sensor circuit. Cooler compressor assembly (A/C lock sensor)
Compressor drive belt
Harness or connector between cooler compressor assembly and air conditioning amplifier assembly
Air conditioning amplifier assembly
CAN communication line

WIRING DIAGRAM

INSPECTION PROCEDURE

1.CHECK CAN COMMUNICATION SYSTEM

Use the intelligent tester to check if the CAN communication system is functioning normally.

ResultResultProceed toCAN DTC is not outputACAN DTC is output (for LHD)BCAN DTC is output (for RHD)CBGO TO CAN COMMUNICATION SYSTEM () CGO TO CAN COMMUNICATION SYSTEM () A2.INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY

w/ Rear Heater

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

Measure the waveform of the connector.

Measurement ConditionItemContentsTerminal No. (Symbol)E35-28 (LOCK) - E35-29 (SG-5)Tool Setting200 mV/DIV., 10 ms/DIV.ConditionEngine running
A/C switch on
Blower switch LO

w/o Rear Heater

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

Measure the waveform of the connector.

Measurement ConditionItemContentsTerminal No. (Symbol)E81-8 (LOCK) - E81-35 (SG-5)Tool Setting200 mV/DIV., 10 ms/DIV.ConditionEngine running
A/C switch on
Blower switch LONGGo to step 3OKREPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY () 3.INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

Disconnect the C30 connector.

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

Standard Resistance:Tester ConnectionConditionSpecified ConditionC30-1 (SSR+) - C30-2 (SSR-)20°C (68°F)65 to 125 ΩNGREPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)OK4.CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C LOCK SENSOR)

w/ Rear Heater

Disconnect the E35 amplifier connector.

Disconnect the C30 compressor connector.

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

Standard Resistance:Tester ConnectionConditionSpecified ConditionE35-28 (LOCK) - C30-1 (SSR+)AlwaysBelow 1 ΩE35-29 (SG-5) - C30-2 (SSR-)AlwaysBelow 1 ΩE35-28 (LOCK) - Body groundAlways10 kΩ or higherE35-29 (SG-5) - Body groundAlways10 kΩ or higher

w/o Rear Heater

Disconnect the E81 amplifier connector.

Disconnect the C30 compressor connector.

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

Standard Resistance:Tester ConnectionConditionSpecified ConditionE81-8 (LOCK) - C30-1 (SSR+)AlwaysBelow 1 ΩE81-35 (SG-5) - C30-2 (SSR-)AlwaysBelow 1 ΩE81-8 (LOCK) - Body groundAlways10 kΩ or higherE81-35 (SG-5) - Body groundAlways10 kΩ or higherNGREPAIR OR REPLACE HARNESS OR CONNECTOROKREPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY ()