Whirlpool MVWC400XW Technical Education page 75

TROUBLESHOOTING GUIDE (continued)
FOR SERVICE TECHNICIANS ONLY
IMPORTANT: Lid must be closed with Lid Lock
Resistance should be between 2k to 3.5k Ω.
enabled to run the SPIN and AGITATE tests.
If values are correct, reconnect J16 and
NOTE: It will take between 4-15 seconds for
proceed to step 7.
the shifter to change states.
If values are open or out of range,
If 120VAC is present, go to step 9.

If 120VAC is not present, to step 17.
go to step 13.

7. Plug in washer or reconnect power. Shifter Switch:
9. With a voltmeter set to DC, connect the
8. With a voltmeter set to AC, connect the black
black probe to J2-3 (Circuit Gnd) and red
probe to J16-2 (N) and red probe to J16-1
probe to J2-1 (Shifter Switch). In manual test
(L1). Activate shifter motor by switching
mode, switch between Spin and Agitate modes.
between Spin and Agitate modes. Energize
2. Unplug washer or disconnect power.
Voltage should toggle between 0 and +5VDC.
outputs using Manual Test Mode.
3. Check to see if basket will turn freely.
SPIN = +5 VDC
IMPORTANT: Lid must be closed with Lid Lock
AGITATE = 0 VDC If basket turns freely, go to step 4.

enabled to run the SPIN and AGITATE
If voltage corresponds to setting, go to
tests.
If basket does not turn freely, determine what


step 10.
is causing the mechanical friction or lockup.
NOTE: It will take between 4-15 seconds for
If voltage does not switch, go to step 12.

the shifter to change states.
4. Remove console to access main control.
Optical Sensor:
If 120VAC is present, go to step 9.
5. Visually check that the J2 and J16 connectors
10. With a voltmeter set to DC, connect the
are inserted all the way into the main control.
If 120VAC is not present, to step 17.
black probe to J2-3 (Circuit Gnd) and red
If visual checks pass, go to step 6.
Shifter Switch:
probe to J2-4 (+13VDC).

If +13VDC is present, go to step 11.
If connectors are not inserted properly,
9. With a voltmeter set to DC, connect the


black probe to J2-3 (Circuit Gnd) and red
reconnect J2 and J16 and repeat step 1.
If +13VDC is not present, go to step 17.

probe to J2-1 (Shifter Switch). In manual
11. With a voltmeter set to DC, connect the black
6. Plug in washer or reconnect power. Run the
test mode, switch between Spin and Agitate
probe to J2-3 (Circuit Gnd) and red probe to J2-2
Gentle Agitation test under Manual Test Mode.
modes. Voltage should toggle between 0
(RPM input). Slowly turn drum by hand. Voltage
and +5VDC.
7. With a voltmeter set to AC; connect black
should toggle between 0 and +5VDC.
probe to J16-5 (N) and red probe to J16-6
SPIN = +5 VDC
If voltage is not confirmed, go to step 12.

(CW Winding).
AGITATE = 0 VDC
If voltage is confirmed, go to step 17.

If 120VAC is cycling ON during CW rotation,

If voltage corresponds to setting, go to step 10. 12. Unplug washer or disconnect power.
go to step 8.
13. Tilt washer back to access the bottom
If voltage does not switch, go to step 12.
If 120VAC is not present, go to Test #1:
of the washer and the drive motor area.

Optical Sensor:
Main Control, page 12.
14. Visually check the electrical connections
to the shifter.
8. With a voltmeter set to AC, connect black probe
If visual check passes, go to step 15.
to J16-5 (N), red probe to J16-7 (CCW Winding). 
If 120VAC is cycling ON during CCW

L1
rotation, go to step 9.
Main Control
If 120VAC is not present, go to Test #1:

Main Control, page 12. J7-1
Shifter Motor Relay
9. Unplug washer or disconnect power.
10. Remove connector J16 from main
Circuit Ground
control. With an ohmmeter, verify resistance
values shown below across the following J16
Figure 4 - Shifter Assembly Strip Circuit (Shifter Switch: Open = SPIN, Closed = AGITATE)
connector pinouts:
Figure 4 - Shifter Assembly Strip Circuit (Shifter Switch Open = SPIN, Closed = AGITATE)
Motor Winding
CW Winding
CCW Winding
Motor Resistance 2k to 3.5k ohms
K8
J16-1
Pin 3
J2-3
Pin 5
J2-4
Pin 4
+13VDC
J16 Connector Pinout
J16, 5 & 6
J16, 5 & 7
If connections are loose, reconnect the
 10. With a voltmeter set to DC, connect the
electrical connections and repeat step 1.
black probe to J2-3 (Circuit Gnd) and red
15. With an ohmmeter, check the harness for
probe to J2-4 (+13VDC).
continuity between the shifter and main control
If +13VDC is present, go to step 11.
using the following pinouts. See chart below.
If +13VDC is not present, go to step 17.
Shifter to Main Control & Drain Pump
Shifter Connector Pin-2 to Main Control J16-2
11. With a voltmeter set to DC, connect the
Shifter Connector Pin-3 to Main Control J16-1
black probe to J2-3 (Circuit Gnd) and red
Shifter Connector Pin-4 to Main Control J2-4
probe to J2-2 (RPM input). Slowly turn drum
Shifter Connector Pin-5 to Main Control J2-3
by hand. Voltage should toggle between 0
Shifter Connector Pin-6 to Main Control J2-2
and +5VDC.
Shifter Connector Pin-7 to Main Control J2-1
If voltage is not confirmed, go to step 12.
If there is continuity, go to step 16. If values are open or out of range, go to step 11.


If there is no continuity, replace the lower
 If voltage is confirmed, go to step 17.
If values are correct, go to step 15.

machine harness and repeat step 1.
12. Unplug washer or disconnect power.
11. Tilt washer back to access the bottom
16. Replace the shifter assembly.
of the washer and the drive motor area.
a. Unplug washer or disconnect power.
13. Tilt washer back to access the bottom
b. Replace shifter assembly.
12. Visually check the mounting bracket and
of the washer and the drive motor area.
c. Reassemble all parts and panels.
electrical connections to the motor and shifter.
14. Visually check the electrical connections
d. Plug in washer or reconnect power. Calibrate
If visual check passes, go to step 13.
to the shifter.

washer and perform Automatic Test to verify repair.
17. Replace main control. If connections are loose, reconnect the
If visual check passes, go to step 15.

a. Unplug washer or disconnect power.
electrical connections, reassemble motor
If connections are loose, reconnect the
b. Replace the main control.
cover, and repeat step 1.
electrical connections and repeat step 1.
c. Reassemble all parts and panels.
13. With an ohmmeter, check the harness
15. With an ohmmeter, check the harness for
d. Plug in washer or reconnect power. Calibrate
for continuity between the main control, motor,
washer and perform Automatic Test to verify repair. continuity between the shifter and main
and run capacitor using the following test
control using the following pinouts. See
chart below.
points. See chart.
TEST #3b: Drive System – Motor
This test checks the motor, motor windings,
Motor Harness Check
wiring, and start capacitor.
Motor Connector Pin-1 to Chassis Ground
NOTE: Refer to Figure 5, "PSC Motor Strip Motor Connector Pin-3 to Main Control J16-7
Motor Connector Pin-3 to Run Capacitor Pin-3
Circuit" on page 15 for tests and measurements.
Motor Connector Pin-6 to Main Control J16-6
IMPORTANT: Drain water from tub before
Motor Connector Pin-6 to Run Capacitor Pin-1
accessing bottom of washer.
Motor Connector Pin-9 to Main Control J16-5
1. Check the motor and electrical connections
If there is continuity, go to step 14.
by performing the Gentle or Heavy Agitation test

If there is continuity, go to step 16.
under Manual Test Mode on page 9. The following
If there is no continuity, replace the lower

steps assume that this step was unsuccessful.
If there is no continuity, replace the lower
machine harness and repeat step 1.
machine harness and repeat step 1.
14. With an ohmmeter, check the motor
windings at the following motor connections.
Shifter Assy
Motor Winding
CW Winding
Pin 2
J16-2
120VAC
CCW Winding
Motor
Pin 7
Resistance should be between 3.5 and 6 Ω .
Shifter Switch
Pin 6
If values are open or out of range, replace

Optical
Sensor
motor.
If values are correct, go to step 15.

6-8
N
Main Control
Motor Pinout
Pins 4 & 6
J7-3
Pins 3 & 6
Shifter Position
J2-1
Input
J2-2
RPM Input