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Home › Nissan-Datsun › 2004 › Sentra SE-R › Repair and Diagnosis › Engine Performance › System › Engine Control System - Qr25DE › DTC P1146: Ho2S2 › Component Inspection › Heated Oxygen Sensor 2 › With Consult-II

With Consult-II

  1. Start engine and warm it up to the normal operating temperature.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Start 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 and wait until 2 minutes have passed from starting the engine.
  5. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "HO2S2 (B1)" as the monitor item with CONSULT-II.
    Fig 1: Displaying ACTIVE TEST With Mode Consult-II
    G00778186Courtesy of NISSAN MOTOR CO., U.S.A.
  6. Check "HO2S2 (B1)" at idle speed when adjusting "FUEL INJECTION" to +/-25%.
    Fig 2: Idle Speed Voltage Graph
    G00778187Courtesy of NISSAN MOTOR CO., U.S.A.

"HO2S2 (B1)" should be above 0.63V at least once when the "FUEL INJECTION" is +25%. 

"HO2S2 (B1)" should be below 0.50V 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.
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