Inspection Of Auto Ac Amplifier False Signal Input to Auto AC Amplifier

False Signal

Condition

Your Work

I icei lür 'üúrn lbdiVifiunH un : is vr.ry high.

AUTO A/C Amplifie*

Open

R nr.jri

Temp Sansor

Remove in-car sensor connector.

Short

Short

Hcicwn Temp. Sensor

Remove room temp. sensor, and ground the number 2 pin of room temp. sensor female connector.

2. System Operation when Input False Signal

Condition: Setting Temperature is at 25°C (77°F)

System Main Parts

False Signal

Motion

Air Mix Control Servomotor

A

Air mix control servo motor shaft moves towards max-hot side.

B

Air mix control servo motor shaft moves towards max-cool side.

Air Vent Mode Damper

Air Flow Mode Control Servomotor

VENT

BI-LEVEL

HEAT

DE t

A

Close

Close

Open

Close

n

Open

Close

Close

Close

3. System Operation when Input False Signal (Cont'd)

System Main Parts

False Signal

Motion

Blower Motor

A

Blower motor rotates at high speed.

B

Water Valve

A

OPEN

B

CLOSE

---

FRE/REC

Control Servomotor

FRE Switch ON

Fresh air is ventilated.

REC Switch 4N

Recirculation air is ventilated.

If necessary, replace the system amplifier.

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