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12. INTERMITTENT WIPER OPERATION | Up
/.25ton/TM-9-2320-289-34 CUCV Series Trucks at intermediate direct support and general support level Manual | Next
15. WASHER WILL NOT SHUT OFF |
TM 9-2320-289-34
Table 2-2. Electrical Troubleshooting (Con’t)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3.
Turn key to “RUN” position, Turn wiper to “ LO” position, then push washer button
and listen for relay click.
If relay clicks, perform step 4.
If relay does not click, perform step 5.
NOTE
Ensure that 2-wire connector remains connected in step 4.
Step 4.
Using test light, probe pink lead and white lead on 2-wire connector to washer
solenoid.
If test light does not go on at both leads, trace white lead circuit from wiper
motor to engine bulkhead connector. (See wiring diagram E-20 or E-21)
If test light goes on at one terminal only, replace park switch assembly. (See
paragraph 10-8)
If test light goes on at both terminals and pink one is dim, ground pink
terminal at wiper motor. If washer pump operates, trace circuit from pink
terminal from wiper motor to switch. (See wiring diagram E-20 or E-21)
If washer pump does not operate, perform step 5.
Step 5.
Disconnect all leads from windshield wiper motor. Remove washer pump cover.
Reconnect 3-wire connector. Turn on wiper motor. Check operation of pawl on
washer pump.
If pawl moves, perform step 6.
If pawl does not move, check to see if washer pump dog spring is properly
connected or pawl is not binding. Connect or replace if damaged. (See
paragraph 10-8)
Step 6.
Connect 12 volt power source to either washer pump solenoid terminal and ground
other terminal for 2 seconds. Pawl should be pulled toward washer solenoid coil,
pawl leg should drop down on gear ramp, and pawl should start rotating ratchet
gear,
If system operates properly, perform step 7.
If pawl operates properly but ratchet gear does not rotate, check to ensure
that pawl engages gear teeth. Inspect pawl and gear for damage. Reposition
or replace if damaged. (See paragraph 10-8)
If pawl leg does not clear rim on ratchet gear, check for burr on pawl leg.
Remove burr with crocus cloth (Item 18, Appendix B) if present, Reposition or
replace washer pump solenoid if improperly positioned or damaged. (See
paragraph 10-8)
2-49
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