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Home >> Toyota >> 2001 >> Sienna CE >> Repair and Diagnosis >> External Pages >> Different car >> Section 477 (Air Conditioning System - Diagnosis) >> Circuit Inspection >> DTC B1422/22 Compressor Lock Sensor Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

This sensor sends 1 pulse 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. And, the indicator flashes at about 1 second intervals.

DETECTION ITEM

DTC No. Detection Item Trouble Area
B1422/22 All conditions below are detected for 3 secs. or more
  1. Engine speed : 450rpm or more
  2. Ratio between engine and compressor speed deviates 20% or more in comparison to normal operation.
  • Compressor.
  • Compressor drive belt.
  • Compressor lock sensor.
  • Harness and connector between compressor and ECM.
  • Harness and connector between ECM and A/C ECU.
  • ECM.
  • A/C ECU.
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