TROUBLESHOOTING SERVICE MANUAL NUMBER 28
Page 1C-24 90-863160 MAY 2000
Pump Motor Will Not Stop Running Down In Auto Mode
TRIM UP/OUT SWITCH AND TRAILER SWITCH INOPERATIVE IN MANUAL MODE
NOTE:An internal timer in the control module stops the pump motor 50 seconds after this
problem condition occurs.
Cause Special Instructions
Loose or dirty solenoid connection. Check connections 7 and 8.
Faulty solenoid.
Check for voltage at terminal 8 while
trimming UP (in MANUAL mode). If
voltage exists, an open condition in
solenoid is indicated and solenoid
must be replaced. If no voltage is
indicated, refer to steps 3 through 6
following.
Loose or corroded trim limit switch
lead connections.
Check connections 32 and 36.
Faulty trim limit switch.
Disconnect trim limit switch leads 32
and 36 and connect a continuity
meter between leads. Continuity
should exist with drive unit in DOWN
position. If not, readjust or replace
switch as necessary.
Open circuit in wiring harness.
Check leads 30, 35, 46 and 2
for loose or corroded connections or
damage.
Faulty control module. Replace.
Pump Motor Will Not Run Up Or Down In Auto Mode
MANUAL MODE FUNCTIONS PROPERLY
Cause Special Instructions
Control module 20 amp fuse blown.
Determine cause for blown fuse and
correct before replacing fuse.
Open in control module battery cables
or wiring harness.
Check cables 16 and 18 and lead
20.
Faulty mode switch.
Check for voltage at terminal 24 and
25 with switch in AUTO mode. If
voltage exists at terminal 25, but not
24, switch is faulty.
Faulty control module. Replace.
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