Trim System Completely Inoperative In Manual Mode; Pump Motor Will Run Up, But Not Down In Both Manual And Auto Modes; Pump Motor Runs Down, But Not Up In Both The Manual And Auto Modes - Mercury BRAVO Service Manual

SERVICE MANUAL NUMBER 28

Trim System Completely Inoperative In Manual Mode

AUTO MODE FUNCTIONS PROPERLY
Faulty mode switch.
Open circuit in wiring harness.

Pump Motor Will Run UP, But Not DOWN In Both Manual And Auto Modes

DOWN SOLENOID DOES NOT CLICK
Loose or dirty solenoid connections.
Faulty mode switch or open in DOWN
circuit.
Faulty DOWN solenoid.
DOWN SOLENOID CLICKS
Loose or dirty solenoid connections.
Faulty solenoid.
Faulty DOWN field winding.

Pump Motor Runs DOWN, But Not UP In Both The Manual And Auto Modes

UP SOLENOID CLICKS
Loose or dirty solenoid connections.
Faulty solenoid.
Faulty UP field winding.
90-863160 MAY 2000
Cause
Cause
Cause
Cause
Special Instructions
Check for voltage at terminal
mode switch in MANUAL mode. If no
voltage is indicated, replace switch.
Check leads 27 and 33
corroded connections or damage.
Special Instructions
Check connections 4,
Check for voltage at terminal
while trimming Down (in MANUAL
mode). If no voltage is indicated,
repeat test at terminal
voltage exists at terminal 23, but not
at 22, switch is faulty. If voltage is
present at terminal 22, check leads
3 and 48 and connector
open condition.
Replace.
Special Instructions
Check connections 10
Check for voltage at terminal
trimming Down (in MANUAL mode). If
no voltage is indicated, replace
solenoid.
Replace field and frame.
Special Instructions
Check connections 5
Check for voltage at terminal
trimming UP. If no voltage is
indicated, replace solenoid.
Replace field and frame.
TROUBLESHOOTING
26 with
for loose or
7 and 12.
12
22 and 23. If
47 for an
and 11.
11 while
and 6.
6 while
Page 1C-25