Dtc B1422/22 Compressor Lock Sensor Circuit

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Air Conditioning. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK MULTIPLEX COMMUNICATION SYSTEM

CHECK CAN COMMUNICATION SYSTEM

INSPECT ECM

INSPECT A/C COMPRESSOR (LOCK SENSOR)

CHECK WIRE HARNESS (ECM - A/C COMPRESSOR)

DTC B1422/22 Compressor Lock Sensor Circuit


DESCRIPTION

This sensor sends 1 pulse per engine revolution to the ECM.
If the ratio between engine and compressor speed deviates 20% or more compared to normal operation, the ECM turns the cooler compressor off and the indicator blinks at approximately 1 second intervals.
The ECM informs the A/C amplifier of the operation condition of the cooler compressor through multiplex communication (CAN and BEAN).

DTC No.
DTC Detection Condition
Trouble Area
B1422/22
Open or short in compressor lock sensor circuit
  1. A/C compressor
  2. A/C compressor drive belt
  3. A/C compressor and magnetic clutch lock sensor
  4. Harness and connector between ECM and A/C compressor
  5. ECM
  6. A/C amplifier

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit


INSPECTION PROCEDURE

1.CHECK MULTIPLEX COMMUNICATION SYSTEM

  1. Use the intelligent tester to check if the Multiplex Communication System (MPX) is functioning normally.

Result:
Result
Proceed to
MPX DTC is not output
A
MPX DTC is output
B


B
GO TO MULTIPLEX COMMUNICATION SYSTEM
A


2.CHECK CAN COMMUNICATION SYSTEM

  1. 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
B


B
GO TO CAN COMMUNICATION SYSTEM
A


3.INSPECT ECM


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Remove the ECM with its connectors still connected.

  1. Measure the waveform of the connector.

    Standard:
    Tester Connection
    		Condition
    		Specified Condition
    E3-10 (LCKI) - Body ground
    		Engine switch on (IG)
    AUTO switch ON
    A/C switch ON
    Magnetic clutch ON
    		Pulse generation
Item
Contents
Tool setting
200 mV/DIV., 10 ms/DIV.
Vehicle condition
Engine switch on (IG)
AUTO switch ON
A/C switch ON
Magnetic clutch ON

Result:

Result
Proceed to
NG
A
OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)
B
OK (When troubleshooting according to the DTC)
C


B
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

C
REPLACE ECM
A


4.INSPECT A/C COMPRESSOR (LOCK SENSOR)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Disconnect the A/C compressor connector.

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

    Standard resistance:
    Tester Connection
    		Specified Condition
    E8-2 (SSR+) - E8-5 (SSR-)
    		160 to 320 Ω


NG
REPLACE A/C COMPRESSOR (LOCK SENSOR)
OK


5.CHECK WIRE HARNESS (ECM - A/C COMPRESSOR)


    Lexus Is250, Is220D. Gse20 Ale20.Air Conditioning.Air Conditioning System. Dtc B1422/22 Compressor Lock Sensor Circuit

  1. Disconnect the A/C compressor connector.

  1. Disconnect the ECM connector.

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

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E3-10 (LCKI) - E8-2 (SSR+)
    		Always
    		Below 1 Ω
    E3-10 (LCKI) - Body ground
    		Always
    		10 kΩ or higher
    E8-5 (SSR-) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM