Toyota Venza Quiz
Heating / Air Conditioning

Compressor Lock Sensor Circuit (B1422/22)

In this manual: Heating / Air Conditioning
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~2min read
SYSTEM DESCRIPTION

The ECM sends the engine speed signal to the A/C amplifier via CAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor is locked, and turns the magnetic clutch off.

DTC No.

DTC Detection Condition

Trouble Area

B1422/22

Open or short in compressor lock sensor circuit
  • A/C compressor (A/C lock sensor)
  • Compressor drive belt
  • Harness or connector between A/C compressor and A/C amplifier
  • A/C amplifier
  • CAN communication system
WIRING DIAGRAM
PROCEDURE

  1. CHECK CAN COMMUNICATION SYSTEM

(a) Use the Techstream to check if the CAN communication system is functioning normally.

Result

Proceed to

CAN DTC is not output

A

CAN DTC is output

B

B

GO TO CAN COMMUNICATION SYSTEM
A

  1. INSPECT A/C COMPRESSOR (A/C LOCK SENSOR)

(a) Disconnect the A/C compressor connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

B9-1 (SSR+) - B9-2 (SSR-)

20 °C

160 to 320 Ω
Text in Illustration

*1

Component without harness connected

(A/C Compressor)

NG

REPLACE A/C COMPRESSOR (A/C LOCK SENSOR)
OK

  1. CHECK HARNESS AND CONNECTOR (A/C AMPLIFIER - A/C LOCK SENSOR)

(a) Disconnect the A/C amplifier connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

D47-8 (LOCK) - B9-1 (SSR+)

Always

Below 1 Ω

D47-13 (GND) - B9-2 (SSR-)

Always

Below 1 Ω

D47-8 (LOCK) - Body ground

Always

10 kΩ or higher

D47-13 (GND) - Body ground

Always

10 kΩ or higher

Result:

Result

Proceed to

NG

A

OK (When troubleshooting according to Problem Symptoms Table)

B

OK (When troubleshooting according to the DTC)

C
Text in Illustration

*1

Front view of wire harness connector

(to A/C Amplifier)

*2

Front view of wire harness connector

(to A/C Compressor)

A

REPAIR OR REPLACE HARNESS OR CONNECTOR

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

C

REPLACE A/C AMPLIFIER

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