Toyota 4Runner: Compressor Lock Sensor Circuit (B1422/22)

Toyota 4Runner Service Manual / Vehicle Interior / Heating / Air Conditioning / Air Conditioning System(for Automatic Air Conditioning System) / Compressor Lock Sensor Circuit (B1422/22)

SYSTEM DESCRIPTION

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier assembly determines that the cooler compressor assembly is locked and turns the magnet clutch assembly off.

DTC Code	DTC Detection Condition	Trouble Area
B1422/22	Open or short in the compressor lock sensor circuit.	Cooler compressor assembly (A/C lock sensor) Compressor drive belt Harness or connector Air conditioning amplifier assembly CAN communication system

WIRING DIAGRAM

CAUTION / NOTICE / HINT

HINT:

As DTC B1422/22 is also output when the compressor drive belt is damaged or loose, inspect the belt before performing troubleshooting.

PROCEDURE

1.	CHECK FOR DTC (CAN COMMUNICATION SYSTEM)

(a) Use the Techstream 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

GO TO CAN COMMUNICATION SYSTEM

2.	INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

(a) Remove the cooler compressor assembly (A/C lock sensor) (See page ).

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
1 - 2	20°C (68°F)	160 to 320 Ω

REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

3.	CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C LOCK SENSOR)

(a) Disconnect the F42 amplifier connector.

(b) Disconnect the B41 sensor connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
F42-8 (LOCK) - B41-1	Always	Below 1 Ω
F42-13 (SG-2) - B41-2	Always	Below 1 Ω
F42-8 (LOCK) - Body ground	Always	10 kΩ or higher
F42-13 (SG-2) - Body ground	Always	10 kΩ or higher

Result

Result	Proceed to
OK (When troubleshooting according to problem symptoms table)	A
OK (When troubleshooting according to the DTC)	B
NG	C

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Ambient Temperature Sensor Circuit (B1412/12)

DESCRIPTION The cooler thermistor (ambient temperature sensor) is installed in the front part of the cooler condenser assembly to detect the ambient temperature and control the air conditioning a ...

Air Inlet Damper Control Servo Motor Circuit (B1442/42)

DESCRIPTION The recirculation damper servo sub-assembly sends pulse signals to inform the No. 1 air conditioning amplifier assembly of the damper position. The No. 1 air conditioning amplifier as ...

Other materials about Toyota 4Runner:

Removal
REMOVAL PROCEDURE 1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. NOTICE: When disconnecting the cable, some systems ne ...

Customize Parameters
CUSTOMIZE PARAMETERS 1. CUSTOMIZING FUNCTION WITH THE TECHSTREAM HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make sure that the function can be customized. Record the curren ...