DTC B1422/22 Compressor Lock Sensor Circuit: Description

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

This sensor sends 4 pulses per engine revolution to the ECM. If the number ratio of the compressor speed divided by the engine speed is smaller than a predetermined value, the ECM turns the compressor OFF. Then the A/C indicator flashes at about 1 second intervals.

DTC DETECTION CONDITION CHART

DTC No.	DTC Detection Condition	Trouble Area
B1422/22	All conditions below are detected for 3 sec. or more: Engine speed: 450 rpm or more Ratio between engine and compressor speed deviates 20% or more in comparison to normal operation	Cooler compressor Cooler compressor drive belt Magnet clutch (Lock sensor) Wire harness Multiplex communication circuit ECM A/C amplifier (A/C control)