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Air Conditioning System (for Automatic Air Conditioning System)





HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System): B1479/79: Flow Sensor Circuit
B1479/79 - Flow Sensor Circuit

DESCRIPTION

The A/C flow sensor, which is mounted on the compressor, is used to detect the amount of refrigerant flow. The A/C flow sensor converts the amount of refrigerant flow that is detected to a voltage value to send it to the air conditioning amplifier assembly. The voltage value sent from the A/C flow sensor changes depending on the amount of refrigerant flow. As the amount of refrigerant flow becomes larger, the voltage becomes lower. As the amount of refrigerant flow becomes smaller, the voltage becomes higher. The air conditioning amplifier assembly supplies 5 V to the A/C flow sensor and monitors changes in the voltage value sent from the A/C flow sensor. The air conditioning amplifier assembly then sends a signal to the ECM via CAN communication to allow the ECM to control the engine speed while the air conditioning is on.





* *1: for 2AR-FE

* *2: for 2GR-FE

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CONFIRM MODEL

Result:





B -- READ VALUE USING TECHSTREAM
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





OK:

The display is as specified in the Normal Condition column.

Result:





B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

C -- REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (A/C FLOW SENSOR)
A -- Continue to next step.

3. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





Result:





B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Automatic Air Conditioning System)
A -- Continue to next step.

4. REPLACE COMPRESSOR ASSEMBLY WITH PULLEY (A/C FLOW SENSOR)

(a) Replace the compressor assembly with pulley (A/C flow sensor) Removal.

HINT
Since the compressor assembly with pulley (A/C flow sensor) cannot be inspected while it is removed from the vehicle, replace the compressor assembly with pulley (A/C flow sensor) with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY (A/C FLOW SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

A -- END

5. CHECK HARNESS AND CONNECTOR (COMPRESSOR ASSEMBLY WITH PULLEY (A/C FLOW SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the I77 air conditioning amplifier assembly connector.

(b) Disconnect the E75 compressor assembly with pulley (A/C flow sensor) connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

6. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





OK:

The display is as specified in the Normal Condition column.

Result:





B -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal

C -- REPLACE COOLER COMPRESSOR ASSEMBLY (A/C FLOW SENSOR)
A -- Continue to next step.

7. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Air Conditioner / Data List.

(e) Check the value(s) by referring to the table below.

Air Conditioner





Result:





B -- PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Air Conditioning System (for Automatic Air Conditioning System)
A -- Continue to next step.

8. REPLACE COOLER COMPRESSOR ASSEMBLY (A/C FLOW SENSOR)

(a) Replace the cooler compressor assembly (A/C flow sensor) Removal.

HINT
Since the cooler compressor assembly (A/C flow sensor) cannot be inspected while it is removed from the vehicle, replace the cooler compressor assembly (A/C flow sensor) with a new or a known good one and check that the condition returns to normal.

(b) Check for the DTC.

Result:





B -- CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (A/C FLOW SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

A -- END

9. CHECK HARNESS AND CONNECTOR (COOLER COMPRESSOR ASSEMBLY (A/C FLOW SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)

(a) Disconnect the I77 air conditioning amplifier assembly connector.

(b) Disconnect the E75 cooler compressor assembly (A/C flow sensor) connector.

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

Standard Resistance:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
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