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 A/C amplifier supplies 5 V to the A/C mass flow sensor and
monitors changes in the voltage value sent from the A/C mass flow sensor. The A/C amplifier 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. READ VALUE USING TECHSTREAM
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(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:
C -- REPLACE A/C COMPRESSOR (A/C MASS FLOW SENSOR)
B -- REPLACE A/C AMPLIFIER
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM
