60
Pressure Sensor
Tan
Brown
Grey
Mounting Clip
Hose Connection
Operating Voltage
: 5 VDC
Output Frequency
: 44.67 Hz (Empty) - 37.04 Hz
(Over
fl
ow)
Location:
See Pressure Sensor Location on page 35.
The pressure sensor is an electronic oscillator that
changes its output frequency according to the air
pressure present on its diaphragm. Air pressure
is delivered to the pressure sensor through the
pressure sensor hose which also connects to the air
dome. The air dome is designed to build air pressure
as water
fi
lls the tub.
Pressure Sensor Strip Circuit
IMC J501-10
IMC J501-12
IMC J501-2
5 VDC
Output
GND
Pressure Sensor
Pressure Sensor Chart
Water Level
Name
Amount of
water in
basket
Frequency
Empty
N/A
44.67 Hz
Steam Reset
-0.4”
43.68 Hz
Steam Set
0”
43.45 Hz
Foam Reset
.68 “
43.02 Hz
Foam Set
1.47”
42.54 Hz
Main Reset
1.86”
42.30 Hz
Main Set
2.85”
41.71 Hz
Door Drain Reset
4.72”
40.57 Hz
Door Drain Set
5.47”
40.11 Hz
Over
fl
ow Set
10.56”
37.04 Hz
Pressure sensor frequency can be read between
pins 1 and 2 of the pressure sensor. The pressure
sensor requires a 5 VDC between pin 2 (brown) and
pin 3 (tan) to operate. The output is taken between
pin 1 (brown) and pin 2 (grey).
Pressure Sensor Strip Circuit
IMC J501-10
IMC J501-12
IMC J501-2
5 VDC
Output
GND
Pressure Sensor
Pressure Sensor Tests
• Enter service mode.
• Run Test 16 and verify displayed frequency with
table with water levels in the table above.
Pressure Sensor Removal
1. Disconnect power to the unit.
2. Remove the control panel. (See
Control Panel
Removal
)
3. Remove the IMC board. (See
IMC Board Remov-
al
)
4. Disconnect the pressure sensor harness and
unclip the pressure sensor from the IMC board.