Maytag MHW9000YW0 Mode D'emploi page 22

FOR SERVICE TECHNICIAN'S USE ONLY
8. With a voltmeter set to DC, connect the
black probe to EB connector EBP3 pin-2 (GND)
and the red probe to EBP3 pin-1 (–7V).
 If –7V DC is present, go to step 9.
 If –7V DC is not present, check the harness
and connections between the CCU and EB.
If the harness and connections are good,
go to TEST #1 on page 13.
9. With a voltmeter set to DC, connect the
black probe to EB connector CIN4 pin-1
(GND) and the red probe to CIN4 pin-3 (Vcc).
 If +5V DC is present, go to step 10.
 If +5V DC is not present, check the
harness and connections between the CCU
and EB. If the harness and connections are
good, go to TEST #1 on page 13.
10. To test for affected out-going voltages,
perform TEST #14 for "Detergent Pump",
TEST #15 for "Level/Presence Sensor
Module", or TEST #16 for "Diverter Valve
Assembly".
11. Unplug washer or disconnect power.
12. Reassemble all parts and panels.
13. Perform the "Quick Diagnostic Test"
on page 6 to verify repair.
TEST #14: Detergent Pump
Perform the following checks if the detergent
pump does not dispense detergent to the tub
(except RINSE & SPIN).
NOTE: Detergent cartridge must be inserted
into dispenser drawer for pump to operate.
1. Unplug washer or disconnect power.
2. Remove top panel to access machine
electronics.
3. Visually check that the DEP2 connector is
inserted all the way into the Expansion Board
(EB). Refer to EB diagram on page 21.
 If visual check passes, go to step 4.
 If connector is not inserted properly, reconnect
DEP2 and run a wash cycle to retest.
4. Remove connector DEP2 from the EB. With an
ohmmeter, measure the resistance across pins 1
and 2. Resistance should be approximately 1.6k Ω.
 If the reading is infinite (open) or out
of range, go to step 5.
 If the reading is correct, go to step 6.
5. With an ohmmeter, measure the resistance
across the detergent pump's 2-pin connector
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attached to the top of the dispenser.
Resistance should be approximately 1.6k Ω.
 If the reading is infinite (open) or out of
range, replace the detergent pump assembly.
 If the reading is correct, check the harnesses
and connections between the detergent
pump and EB. Repair as necessary.
6. With a voltmeter set to AC, connect the
voltmeter leads across the detergent pump's
2-pin connector attached to the top of the
dispenser.
7. Plug in washer or reconnect power.
8. Select "Normal Wash" and then press and
hold the START button for 3 seconds. Watch
for line voltage across DEP2, pins 1 and 2.
NOTE: This voltage can only be measured
when the detergent pump is actuated, for
approximately 1–5 seconds toward the end
of the FILL cycle.
 If line voltage is present, replace the
detergent pump assembly.
 If line voltage is not present, perform TEST
#15: Level/Presence Sensor Module. If test
passes, replace the expansion board.
9. If the preceding steps did not correct the
detergent distribution problem, replace the CCU.
 Unplug washer or disconnect power.
 Replace the CCU.
 Reassemble all parts and panels.
 Perform the "Quick Diagnostic Test"
on page 6 to verify repair.
TEST #15: Level/
Presence Sensor Module
Perform the following checks if the washer
cannot detect the presence of the detergent
cartridge or the level of detergent in the cartridge.
1. Verify that the detergent cartridge is inserted
into the dispenser drawer and that the drawer is
fully inserted into the dispensing system.
2. Press the Precision Dispense (Whirlpool)
or optimal dispense (Maytag) button to display
dispensing information and status. If the
information or status is invalid, proceed to step 3.
3. Remove detergent cartridge from
dispenser drawer. Inside the cartridge, check
if float is stuck or damaged. Repair or replace
as necessary. Reassemble cartridge into
drawer and slide into dispensing system.
DO NOT REMOVE OR DESTROY