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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 P0420 Or DTC P0430 >> 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.
NOTE: If DTC confirmation test has been previously performed, turn ignition off and wait at least 10 seconds before performing next DTC confirmation test.
NOTE: Open hood before conducting the following procedure. DO NOT keep engine at specified speeds longer than the specified minutes.

With CONSULT-II

  1. Turn ignition on. Select DTC & SRT CONFIRMATION then SRT WORK SUPPORT mode with CONSULT-II. Start engine. Hold engine speed at 2500-3500 RPM for 3 consecutive minutes.
  2. Release accelerator pedal completely. If CATALYST changes from INCMP to CMPLT, go to step  5 . If CATALYST does not change from INCMP to CMPLT, go to next step.
  3. Let engine idle for 5 seconds, then hold engine speed at 2000-3000 RPM until CATALYST changes from INCMP to CMPLT (it will take about 5 minutes).
  4. If CMPLT is not displayed, stop engine and cool to less than 158°F (70°C), then retest from step  1 .
  5. Select SELF-DIAG RESULTS mode with CONSULT-II. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE  . If 1st trip DTC is not detected, system is okay at this time.
NOTE: Use the following test to check overall function of 3-way catalyst. During this test, 1st trip DTC may not be confirmed.
CAUTION: DO NOT use ECM ground terminals when measuring voltage.

With Generic Scan Tool

  1. Start engine and drive vehicle at a speed of more than 43 MPH for 2 consecutive minutes. Stop vehicle and leave engine running.
  2. Measure voltage between ground and HO2S1 signal circuit at ECM terminal No. 62 (bank 1) or No. 63 (bank 2) by backprobing. See Figure and Figure .
  3. Also, measure voltage between ground and HO2S2 signal circuit at ECM terminal No. 94 (bank 1) or No. 95 (bank 2) by backprobing.
  4. Increase engine speed to 2000 RPM. If switching frequency of HO2S2 is less than 75 percent of HO2S1 switching frequency, system is okay at this time.
  5. If switching frequency of HO2S2 is not less than 75 percent of HO2S1 switching frequency, go to DIAGNOSTIC PROCEDURE  .
  6. If HO2S1 does not switch more than 5 times within 10 seconds, diagnose and repair HO2S1. See DTC P0133 OR P0153  .
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