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All rights reserved. Only training and service purposes.
Checking Method for Key Components
• Pulse signal output value and valve operation
• Output pulse sequence
- In valve close state: 4 ’ 3 ’ 2 ’ 1 ’ 4
- In valve open state: 1 ’ 2 ’ 3 ’ 4 ’ 1
* 1. If EEV open angle does not change, all of output phase will be OFF
2. If output phase is different or continuously in the ON state, motor will not operate smoothly and start
vibrating.
• EEV valve operation
ø1 ON ON OFF ON
ø2 ON ON ON OFF
ø3 OFF OFF ON OFF
ø4 OFF OFF OFF ON
Output(ø) No.
Output state
1 2 3 4
- At power ON, open angle signal of 1400 pulses out-
put and valve position is set to ⓐ
If valve operates smoothly, no noise and vibration
occurs and if valve is closed. noise occurs.
- Noise from EEV can be confirmed by touching the
EEV surface with a screw driver and listening the
EEV noise.
- If liquid refrigerant is in EEV, the noise is lower.
2.3 Electronic Expansion Valve
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