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Home >> Nissan-Datsun >> 2000 >> Altima GXE L4-2.4L (KA24DE) >> Repair and Diagnosis >> Sensors and Switches >> Sensors and Switches - Powertrain Management >> Sensors and Switches - Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection

Oxygen Sensor: Testing and Inspection

Front heated oxygen sensor




With Consult
1. Start engine and warm it up to normal operating temperature.
2. Select "MANU TRIG" and "HI SPEED" in "DATA MONITOR" mode with CONSULT-II, and select "FR O2 SENSOR" and "FR O2 MNTR".
3. Hold engine speed at 2,000 rpm under no load during the following steps.
4. Touch "RECORD" on CONSULT-II screen.




5. Check the following.
- "FR O2 MNTR" in "DATA MONITOR" mode changes from "RICH" to "LEAN" to "RICH" 5 times in 10 seconds. 5 times (cycles) are counted as shown below:
cycle | 1 | 2 | 3 | 4 | 5 |
FR O2 MNTR R-L-R-L-R-L-R-L-R-L-R
R = "FR O2 MNTR", "RICH"
L = "FR O2 MNTR", "LEAN"

- "FR O2 SENSOR" voltage goes above 0.6V at least once.
- "FR O2 SENSOR" voltage goes below 0.35V at least once.
- "FR O2 SENSOR" voltage never exceeds 1.0V.

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.

OR




Without Consult
1. Start engine and warm it up to normal operating temperature.
2. Set voltmeter probes between ECM terminal (46) (sensor signal) and engine ground.
3. Check the following with engine speed held at 2,000 rpm constant under no load.
- Malfunction indicator lamp goes on more than 5 times within 10 seconds in Diagnostic Test Mode I (FRONT HEATED OXYGEN SENSOR MONITOR).
- The maximum voltage is over 0.6V at least one time.
- The minimum voltage is below 0.35V at least one time.
- The voltage never exceeds 1.0V

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.





Front heated oxygen sensor heater
Check resistance between terminals (3) and (1).
Resistance: 2.3 - 4.3 ohms at 25°C (77°F)
Check continuity between terminals (2) and (1), (3) and (2).
Continuity should not exist. If NG, replace the front heated oxygen sensor.

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.







Rear heated oxygen sensor

With Consult
1. Start engine and drive vehicle at a speed of more than 70 kph (43 mph) for 2 consecutive minutes.
2. Stop vehicle with engine running.
3. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "RR O2 SENSOR" as the monitor item with CONSULT-II.
4. Check "RR O2 SENSOR" at idle speed when adjusting "FUEL INJECTION" to ± 25%.
"RR O2 SENSOR" should be above 0.56V at least once when the "FUEL INJECTION" is +25%.
"RR O2 SENSOR" should be below 0.54V at least once when the "FUEL INJECTION" is -25%.

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.

OR

Without Consult
1. Start engine and drive vehicle at a speed of more than 70 kph (43 mph) for 2 consecutive minutes.
2. Stop vehicle with engine running.
3. Set voltmeter probes between ECM terminals (52)(sensor signal) and engine ground.
4. Check the voltage when rewing up to 4,000 rpm under no load at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.56V at least once.
If the voltage is above 0.56V at step 4, step 5 is not necessary.




5. Check the voltage when racing up to 6,000 rpm under no load. Or keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 kph (50 MPH) in 3rd gear position (M/T), D position with "OD" OFF (A/T).
The voltage should be below 0.54V at least once.

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.

Rear Heated Oxygen Sensor Heater




Check the following.
1. Check resistance between terminals (2) and (3).
Resistance: 2.3 - 4.3 ohm at 25°C (77°F)




2. Check continuity.

If NG, replace the rear heated oxygen sensor.

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.
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