Toyota RAV4 manuals

Toyota Sienna Service Manual: Compressor Lock Sensor Circuit

DTC B1422/22 Compressor Lock Sensor Circuit

SYSTEM DESCRIPTION

The ECM sends an engine speed signal to the A/C amplifier via CAN communication and BEAN 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 locks, and turns the magnetic clutch off.

WIRING DIAGRAM

Compressor Lock Sensor Circuit

INSPECTION PROCEDURE

1 CHECK CAN COMMUNICATION SYSTEM

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

Result

2 CHECK MULTIPLEX COMMUNICATION SYSTEM

(a) Use the intelligent tester to check if the multiplex communication system (BEAN) is functioning normally.

Result

3 INSPECT A/C AMPLIFIER

INSPECT A/C AMPLIFIER

(a) Remove the A/C amplifier with the connectors still connected.

INSPECT A/C AMPLIFIER

(b) Measure the waveform of the connector.

Standard

Result

4 INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)

INSPECT COMPRESSOR AND MAGNETIC CLUTCH (A/C LOCK SENSOR)

(a) Disconnect the connector from the A/C compressor.

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

Standard resistance

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

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

(a) Disconnect the connector from the A/C amplifier.

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

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

Standard resistance

REPLACE A/C AMPLIFIER

Solar Sensor Circuit (Passenger Side)
DTC B1421/21 Solar Sensor Circuit (Passenger Side) DESCRIPTION The solar sensor, which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioni ...

Pressure Sensor Circuit
DTC B1423/23 Pressure Sensor Circuit DESCRIPTION This DTC is output when refrigerant pressure on the high pressure side is extremely low (0.19 MPa (2.0 kgf/cm2, 28 psi) or less) or extremely high ...

Other materials:

DTC check / clear
NOTICE: All the stored DTCs and freeze frame data are erased if:  the ECM is changed from normal mode to check mode or vice versa; or 2) the ignition switch is turned from ON to ACC or off while in check mode. Before changing modes, always check and make a note of any DTCs and fr ...

Adjustment
1. INSPECT SHIFT LEVER POSITION (a) When shifting from P to R position only with ignition switch ON and brake pedal, make sure that the shifting lever moves smoothly and can be moderately operated. (b) When starting engine, make sure that the vehicle moves forward when shifting from N to D p ...

Installation
HINT: Install the RH side by the same procedures with LH side. 1. INSTALL FRONT SPEED SENSOR LH (a) Install the speed sensor front LH with the bolt. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) NOTICE: Keep the tip of the front speed sensor LH. (b) Install the sensor harness clamps with th ...

В© 2011-2026 Copyright www.tsienna.net