Component Inspection

Component Inspection

1. INSPECTION START

   Will CONSULT be used?

   YES >>

   GO TO 2.

   NO >>

   GO TO 3.

2. CHECK HEATED OXYGEN SENSOR 2-1

   With CONSULT

   1. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

   2. Start engine and warm it up to the normal operating temperature.

   3. Turn ignition switch OFF and wait at least 10 seconds.

   4. Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

   5. Let engine idle for 1 minute.

   6. Select “FUEL INJECTION” in “ACTIVE TEST” mode of “ENGINE”, and select “HO2S2 (B1)” as the monitor item with CONSULT.

   7. Check “HO2S2 (B1)” at idle speed when adjusting “FUEL INJECTION” to ± 25%.

      

      	: The voltage should be above 0.73 V at least on time.
      	: The voltage should be below 0.18 V at least on time.

      “HO2S2 (B1)” should be above 0.73 V at least once when the “FUEL INJECTION” is +25%.

      “HO2S2 (B1)” should be below 0.18 V at least once when the “FUEL INJECTION” is +25%.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 6.

3. CHECK HEATED OXYGEN SENSOR 2-2

   Without CONSULT

   1. Start engine and warm it up to the normal operating temperature.

   2. Turn ignition switch OFF and wait at least 10 seconds.

   3. Restart engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

   4. Let engine idle for 1 minute.

   5. Check the voltage between ECM harness connector terminals under the following conditions.

      ECM			Condition	Voltage
      Connector	+	–
      	Terminal
      F25	77	76	Revving up to 4,000 rpm quickly under no load at least 10 times. (Depress and release the accelerator pedal as quickly as possible.)	The voltage should be above 0.73 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 4.

4. CHECK HEATED OXYGEN SENSOR 2-3

   Without CONSULT

   Check the voltage between ECM harness connector terminals under the following conditions.

   ECM			Condition	Voltage
   Connector	+	–
   	Terminal
   F25	77	76	Keeping engine at idle for 10 minutes.	The voltage should be above 0.73 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 5.

5. CHECK HEATED OXYGEN SENSOR 2-4

   Without CONSULT

   Check the voltage between ECM harness connector terminals under the following conditions.

   CAUTION:

   Always drive Nissan Sentra vehicle at a safe speed.

   ECM			Condition	Voltage
   Connector	+	–
   	Terminal
   F25	77	76	Coasting from 80 km/h (50 MPH) in D position (CVT) or 4th position (M/T).	The voltage should be above 0.73 V at least once during this procedure. The voltage should be below 0.18 V at least once during this procedure.

   Is the inspection result normal?

   YES >>

   INSPECTION END

   NO >>

   GO TO 6.

6. REPLACE HEATED OXYGEN SENSOR 2

   Replace heated oxygen sensor 2. Refer to Exploded View.

   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.

   >>

   INSPECTION END