Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - HEATING / AIR CONDITIONING
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 Code | DTC Detection Condition | Trouble Area |
| B1422/22 | 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.
| Result | Proceed to |
| CAN DTC is not output | A |
| CAN DTC is output (for LHD) | B |
| CAN DTC is output (for RHD) | C |
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| A | |
| 2.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.
| Item | Contents |
| Terminal No. (Symbol) | E35-28 (LOCK) - E35-29 (SG-5) |
| Tool Setting | 200 mV/DIV., 10 ms/DIV. |
| Condition | Engine 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.
| Item | Contents |
| Terminal No. (Symbol) | E81-8 (LOCK) - E81-35 (SG-5) |
| Tool Setting | 200 mV/DIV., 10 ms/DIV. |
| Condition | Engine running A/C switch on Blower switch LO |
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| OK | ||
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| 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 Connection Condition Specified Condition C30-1 (SSR+) - C30-2 (SSR-) 20°C (68°F) 65 to 125 Ω
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| OK | |
| 4.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 Connection Condition Specified Condition E35-28 (LOCK) - C30-1 (SSR+) Always Below 1 Ω E35-29 (SG-5) - C30-2 (SSR-) Always Below 1 Ω E35-28 (LOCK) - Body ground Always 10 kΩ or higher E35-29 (SG-5) - Body ground Always 10 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 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
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| OK | ||
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