Valve Coils; Remove All Rings, Watches And Other Jewelry - Genie GTH-636 Service Manual

Section 4 • Repair Procedures
MANIFOLDS
7-24

Valve Coils

How to Test a Coil
A properly functioning coil provides an
electromotive force which operates the solenoid
valve. Critical to normal operation is continuity
within the coil that provides this force field.
Electrocution hazard. Contact with
electrically charged circuits could
result in death or serious injury.
Remove all rings, watches and
other jewelry.
1 Start the engine.
2 While activating the appropriate machine
function, apply a steel wrench to the tip of the
solenoid valve. Release the wrench.
Result: The wrench sticks to the tip of the valve.
The valve coil is functioning correctly.
Result: The wrench does not stick to the valve.
The valve coil is not functioning correctly.
3 Disconnect the wire harness from the valve coil.
4 Using a multimeter set to read DC voltage,
attach the positive lead to one of the terminals
of the valve coil connector.
5 Attach the negative lead to a ground point on
the chassis.
Result: The multimeter displays approximately
13V DC. The wire harness is good. Replace the
valve coil.
Result: The multimeter displays 0V DC. The
valve coil is good; the wire harness is faulty.
Repair or replace the wire harness.
4 - 72 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
June 2007
REV C
Part No. 97487