Troubleshooting Tests - Maytag Pet Pro Technical Manual

TROUBLESHOOTING TESTS

TEST #1: Main Control (ACU)
This test checks for incoming and outgoing power to and from main control.
This test assumes that proper voltage is present at the outlet.
1. Unplug washer or disconnect power.
2. Remove console to access main control.
3. Verify that all connectors are inserted all the way into the main control.
4. With a voltmeter set to AC, connect black probe to J1-1 (Neutral) and
red probe to J1-2 (Line). Plug in washer or reconnect power.
➢ If 120 VAC is present, go to step 5.
➢ If 120 VAC is not present, check the AC power cord for continuity
(See Figure 7).
5. Is the "Diagnostic LED" flashing or continuously "ON" or "OFF"?
See Figure 1 for LED location).
➢ Flashing: (+5 VDC present and micro operating) proceed to HMI Test.
➢ ON: (+5 VDC but micro failure) continue to step 8.
➢ OFF: (+5 VDC missing or micro failure) continue to step 6.
6. Check if console HMI is affecting the main control DC supply.
a. Unplug washer or disconnect power.
b. Remove connector J5 from main control.
c. Plug in washer or reconnect power.
7. Perform voltage checks inside header J5 on the board – do not short
pins together.
a. With a voltmeter set to DC, connect black probe to J5-4 (Circuit Gnd)
and red probe to J5-1 (+12 VDC).
➢ If DC voltage is not present, go to step 8.
➢ If the DC voltage is present, but the diagnostic LED is not flashing,
continue to step 8.
8. Main Control has malfunctioned.
a. Unplug washer or disconnect power.
b. Replace the main control.
c. Reassemble all parts and panels.
d. Plug in washer or reconnect power. Perform Service Diagnostic cycle to
verify repair.
TEST #2: Valves
This test checks the electrical connections to the valves, and the valves
themselves.
1. Check the relays and electrical connections to the valves by performing
Water Valve test sequence under
activates and deactivates the selected valve. The following steps
assume one (or more) valve(s) did not turn on.
2. For the valve(s) in question check the individual solenoid valves.
a. Unplug washer or disconnect power.
b. Remove console to access main control.
c. Remove connector J8 from main control. Refer to
Control.
d. Check harness continuity and connection to solenoid valves.
28
FOR SERVICE TECHNICIAN'S USE ONLY
Component Activation. Each test
Figure 7 - Main
3. Check resistance of the valve coils across the following J8 connector
pinouts:
Valve
Fabric Softener
Hot
Cold
Resistance should be 890-1090 Ω.
➢ If resistance readings are tens of ohms outside of range, replace the
valve assembly.
➢ If resistance readings are within range, replace main control and
perform Service Diagnostics to verify repair.
TEST #3: Drive System
1. Enter Service mode and view Fault Codes. If F7E1, F7E3, F7E4, F7E6
or F7E7 faults are shown then there is likely a motor or shifter related
issue Take note of the faults and clear the faults.
2. Once the error codes are cleared, enter Component Activation mode
and run the Slow Agitation test; if the motor runs after 15–20 seconds,
there is not a problem with the motor, control, or motor wiring harness
connections.
3. Next, within Component Activation mode, run the Spin Low Speed
cycle. If the motor hums briefly and then shuts down, go to Fault Code
display mode and check for fault codes.
4. After running agitation and spin test, check for fault codes.
TEST #3a: Drive System – Shifter
This test checks connections, shifter coil, and harness.
NOTE: Lid must be closed and locked for the motor to agitate or spin.
IMPORTANT: Drain water from tub before accessing bottom of washer.
Functional Check:
1. Check the shifter and electrical connections by performing both the
Spin and Wash test under Component Activation
steps assume that this step was unsuccessful.
2. Unplug washer or disconnect power.
3. The motor and shifter should be able to be turned independently of
each other. If they are locked together, there is a shifter slider issue.
Proceed to step 11.
➢ If basket and impeller turn freely, go to step 4.
➢ If basket and/or impeller do not turn freely, determine what is causing
the mechanical friction or lockup.
4. Remove console to access main control.
5. Visually check that the J2 and J6 connectors are inserted all the way
into the main control.
➢ If visual checks pass, go to step 6.
➢ If connector is not inserted properly, reconnect J2 and J6 and repeat
step 1.
Shifter Motor:
NOTE: Before starting the electrical check, verify that the cam on the
splutch is moving freely and not binding.
Pinout
J8, 1 & 6
J8, 1 & 5
J8, 1 & 3
Mode. The following