TM 5-3805-263-14&P-3
SUPPLEMENTAL STEERING SYSTEM
PROBLEM 4
SYMPTOMS:
Motor status light ON and pump group motor runs continuously
(constantly) when disconnect switch is ON.
Possible Causes:
A. Magnetic switch contacts welded together.
B. Failure of the Automatic/ Manual switch in Manual (closed)
position.
C. Magnetic switch coil shorted to positive battery.
D. Cable from magnetic switch to pump group motor shorted to
positive (+) battery.
E. Failure of electronic control module.
Troubleshooting:
a) With engine stopped and disconnect switch OFF, remove
the cables from the two large terminals on the magnetic
switch. Measure resistance across the two large terminals
on the solenoid switch. If resistance measures less than
5000 ohms, make a replacement of the switch.
b) Check for continuity through the Automatic/ Manual switch.
If there is continuity, make a replacement of the switch.
c) With engine stopped and disconnect switch OFF, check for
continuity between the positive side large terminal of the
magnetic switch and either of the smaller coil terminals. If
continuity, make a replacement of the magnetic switch. If no
continuity, troubleshoot the wire to the magnetic switch for
short to positive battery.
d) After three seconds with the disconnect switch ON, check
for voltage at the motor side large terminal of the magnetic
switch. If voltage is measured, troubleshoot the cable
between the magnetic switch and motor for short to positive
battery. If no voltage measured, go to step e.
e) Make a replacement of the electronic control module.
PROBLEM 5
SYMPTOMS:
Motor status light ON and pump motor runs continuously until
engine starts.
Possible Causes:
A. Electrical circuit from the alternator "R" terminal to electronic
control module receptacle Y, socket 7 is shorted to positive
(+) battery.
Troubleshooting:
a) With the disconnect switch ON and the engine stopped,
there should be no voltage between sockets 7 and 8 of the
electronic control module receptacle Y. If voltage is
measured, troubleshoot wire for short to positive battery. If
no short is found, problem is in alternator.
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