Sentra L4-2.5L (QR25DE) (2003)
6. Check the following.
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"HO2S1 MNTR (B1)" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds. 5 times (cycles) are
counted as shown at right.
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"HO2S1 (B1)" voltage goes above 0.6 V at least once.
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"HO2S1 (B1)" voltage goes below 0.3 V at least once.
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"HO2S1 (B1)" voltage never exceeds 1.0 V.
CAUTION:
-
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete
floor; use a new one.
-
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and
approved anti-seize lubricant.
Without CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal 92 [HO2S1 (B1) signal] and engine ground.
3. Check the following with engine speed held at 2,000 rpm constant under no load.
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The voltage fluctuates between 0 to 0.3 V and 0.6 to 1.0 V more than 5 times within 10 seconds.
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The maximum voltage is over 0.6 V at least one time.
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The minimum voltage is below 0.3 V at least one time.
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The voltage never exceeds 1.0 V.
1 time: 0 - 0.3 V -> 0.6 - 1 .0 V > 0 - 0.3 V
2 times: 0 - 0.3 V -> 0.6 - 1 .0 V -> 0 - 0.3 V -> 0.6 - 1.0 V
CAUTION:
-
Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete
floor; use a new one.
-
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and