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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 39 (Engine Controls - Self-Diagnostics - 1.8L - XE, GXE) >> Diagnostic Tests >> DTC P0139 Or DTC P0159 >> DTC Confirmation Test

DTC Confirmation Test

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Always drive vehicle at a safe speed.
NOTE: If DTC confirmation test has been previously performed, always turn ignition off and wait at least 10 seconds before performing the next test.

With CONSULT-II

  1. Start engine and warm to normal operating temperature. Turn ignition off and wait at least 10 seconds. Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Ensure COOLAN TEMP/S indicates more than 158°F (70°C).
  2. Select HO2S2 (B1)/(B2) P0139/P0159 of HO2S2 in DTC WORK SUPPORT mode with CONSULT-II. Start engine. Follow instructions on CONSULT-II screen.
  3. Press SELF-DIAG RESULTS. If OK is displayed, system is okay at this time. If NG is displayed, go to DIAGNOSTIC PROCEDURE  . If CANNOT BE DIAGNOSED is displayed, go to next step.
  4. Stop engine. Allow engine to cool until COOLAN TEMP/S indicates less than 158°F (70°C). Turn ignition on. Select DATA MONITOR mode with CONSULT-II. Start engine. When COOLAN TEMP/S reaches 158°F (70°C), return to step  2 .
NOTE: Use the following test to check overall function of HO2S2 circuit. During this test, 1st trip DTC may not be confirmed.

With Generic Scan Tool (Overall Function Check)

  1. Start engine. Drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle with engine running.
  2. Measure voltage between ground and ECM terminal No. 63 (bank 1) or No. 95 (bank 2) by backprobing. See Figure . See Figure or Figure .
  3. While monitoring voltage, snap throttle to 4000 RPM at least 10 times. Voltage should change at a rate of more than .06 volt per second during this procedure.
  4. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to next step.
  5. Let engine idle for 10 minutes, then measure voltage again. Or, measure voltage while coasting from 50 MPH in 3rd gear. If voltage is as specified, system is okay at this time. If voltage is not as specified, go to DIAGNOSTIC PROCEDURE  .
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