GE CGA 351, User Manual

Page: 80 / 133

December 2004
5-2 Service and Maintenance
Checking the Wiring
Complete the two checks listed below to correct any wiring problems.
!WARNING!
Be careful when tightening the terminal block electrical
connections. Full line voltage is present on some terminals.
IMPORTANT: These symbols indicate Caution - dangerously hot
surfaces and risk of electric shock, respectively:
1.
Open the cover on the sensor enclosure and remove the lower
front panel from the electronics enclosure.
Note:
For information regarding component locations and/or wiring
connections in an optional enclosure, see Appendix C.
2.
Check all wiring, including that performed at the factory. Refer to
the wiring instructions in Chapter 2,
Installation , and the wiring
diagram in Figure 2-2 on page 2-10, to make sure that all wires are
attached to the correct pins. If any connections are loose, turn the
screws clockwise with a small screwdriver to secure the
connections.
3.
Locate the oxygen sensor clips (see Figure 5-2 on page 5-25) and
short them together with a jumper. The oxygen display should
read 20.93%.
Note:
Due to an uncorrected offset in some units, an exact reading of
20.93% may not be obtained. However, the result should be
close to this value.
4.
If the wiring is good and a 20.93% oxygen reading is obtained
with the shorted clips,
remove the jumper , and proceed to the
next section.
Note:
If an open loop (OL) is measured at the oxygen sensor clips,
recheck the wiring and try again. If the OL reading repeats,
contact the factory for assistance.
Note:
A cold sensor will always indicate an open loop (OL).
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