OXYGEN
2-25
11) Observe RICH/LEAN lights while operating
sensor.
• After sensor tip is hot. move the flame until the
sensor tip is completely surrounded by the flame.
This keeps oxygen away from the tip. See Fig. 2.
– Good Sensor:
RICH light turns ON within 3
seconds indicating a “rich” (low oxygen) condition.
– Bad Sensor:
RICH light takes longer than 3
seconds to turn on, or does not turn on at all.
• Move flame so oxygen can reach sensor tip.
(Keep sensor tip hot with flame.) See Fig. 1.
– Good Sensor:
LEAN light turns ON within 3
seconds indicating a “lean” (high oxygen) condition.
– Bad Sensor:
LEAN light takes longer than 3
seconds to turn on, or does not turn on at all.
12) Repeat step 11 a few times to verify results.
13) Testing is complete.
Extinguish flame, set RANGE switch to POWER
OFF, let sensor cool and remove test leads.
IMPORTANT: Special anti-seize compound must be
applied to sensor housing threads before reinstallation.
Refer to vehicle service manual for proper type.
RICH
LEAN
RICH
LEAN
Fig. 1
Fig. 2
Summary of Contents for CP9087
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