Testing the Pump Control Solenoid Coil
Typically, a failed solenoid coil will either be shorted (very low or no resistance)
or open (infinite resistance).
1. Locate the pump control solenoid coil to be tested and disconnect the wire
harness connector from the coil.
Note:
Prior to taking small resistance readings with a digital multimeter, short
the meter test leads together. The meter will display a small resistance value
(usually 0.5 ohms or less). This resistance is due to the internal resistance of
the meter and test leads. Subtract this value from the measured value of the
component you are testing to obtain an accurate reading.
2. Using a multimeter (ohms setting), measure the resistance between the two
(2) connector terminals on the solenoid coil. Coil resistance should be
3.66
ohms when tested at 20 C (68 F)
.
g256511
Figure 114
1.
Solenoid coil
3.
Coil nut
2.
O-ring (2 each)
3. Replace the coil as necessary:
A. Use a 12 point, 26 mm socket to remove the coil nut.
B. Slide the coil and O−rings from the valve stem. Discard the O−rings and
clean all corrosion or dirt from the valve.
C. Lubricate new O−rings with petroleum jelly and slide the new coil with
O−rings onto the valve stem.
D. Use a 12 point, 26 mm socket to install and tighten the coil nut from
5
N∙m (44 in−lb)
. Do not over−tighten coil nut.
4. If the solenoid coil resistance is correct and a circuit problem still exists,
check the wire harness; refer to
Appendix A (page A–1)
.
5. After testing is completed, connect the wire harness connector to the
solenoid coil.
Electrical System: Electrical Component Testing
Page 6–76
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