Toyota Venza: Compressor Solenoid Circuit (B1451/51)

Toyota Venza Service Manual / Heating / Air Conditioning / Air Conditioning System / Compressor Solenoid Circuit (B1451/51)

DESCRIPTION

In this circuit, the A/C compressor receives a refrigerant compression demand signal from the A/C amplifier.

Based on this signal, the A/C compressor changes the amount of compressor output.

DTC No.	DTC Detection Condition	Trouble Area
B1451/51	Open or short in A/C compressor solenoid circuit	A/C compressor (solenoid valve) Harness or connector between A/C amplifier and A/C compressor (solenoid valve) A/C amplifier

WIRING DIAGRAM

PROCEDURE

1.	INSPECT A/C COMPRESSOR (SOLENOID VALVE)

(a) Disconnect the A/C compressor (solenoid valve) connector.

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B29-2 (SOL+) - B29-1 (SOL-)	20°C (68°F)	10 to 11 Ω

Result	Proceed to
OK	A
NG (for 2GR-FE)	B
NG (for 1AR-FE)	C

Text in Illustration

*1	Component without harness connected (A/C Compressor (Solenoid Valve))

REPLACE A/C COMPRESSOR (SOLENOID VALVE)

2.	CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - BODY GROUND)

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

Standard Resistance:

Tester Connection	Condition	Specified Condition
B29-1 (SOL-) - Body ground	Always	Below 1 Ω

Text in Illustration

*1	Front view of wire harness connector (to A/C Compressor (Solenoid Valve))

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.	CHECK HARNESS AND CONNECTOR (A/C COMPRESSOR (SOLENOID VALVE) - A/C AMPLIFIER)

(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
D47-2 (SOL+) - B29-2 (SOL+)	Always	Below 1 Ω
D47-2 (SOL+) - 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

Front view of wire harness connector

(to A/C Amplifier)

Front view of wire harness connector

(to A/C Compressor (Solenoid Valve))

REPAIR OR REPLACE HARNESS OR CONNECTOR

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

REPLACE A/C AMPLIFIER

Driver Side Solar Sensor Short Circuit (B14A2)

DESCRIPTION The solar sensor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the solar sensor varies i ...

BUS IC Communication Malfunction (B1497/97)

DESCRIPTION The air conditioning harness connects the A/C amplifier and each servo. The A/C amplifier supplies power and sends operation instructions to each servo through the air conditioning ha ...

Other materials about Toyota Venza:

Installation
INSTALLATION PROCEDURE 1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY (for Exhaust Side) (a) Apply a light coat of engine oil to a new O-ring, and install it to the oil control valve. Text in Illustration *1 ...

Air Conditioning Amplifier
Components COMPONENTS ILLUSTRATION Installation INSTALLATION PROCEDURE 1. INSTALL AIR CONDITIONING AMPLIFIER ASSEMBLY (a) Install the air conditioning amplifier assembly with the 2 screws. ...

Pressure Control Solenoid "D" Performance (Shift Solenoid Valve SLT) (P2714)
SYSTEM DESCRIPTION The linear solenoid valve (SLT) controls the transmission line pressure for smooth transmission operation based on signals from the throttle position sensor and the vehicle speed sensor. The TCM adjusts the current to SLT solenoid valve ...