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Home >> Mitsubishi >> 2003 >> Lancer Evolution >> Repair and Diagnosis >> External Pages >> Different car >> Section 30 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0420: Catalyst System Efficiency Below Threshold - Bank 1 Or DTC P0430: Catalyst System Efficiency Below Threshold - Bank 2 >> DTC Confirmation Test (Using CONSULT-II)
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DTC Confirmation Test (Using CONSULT-II)

WARNING: This page is about a different car, the 2002 Nissan Maxima and 2002 Infiniti I35. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Open hood before conducting the following procedure. DO NOT keep engine at specified speeds longer than the specified times.
  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. Release accelerator pedal completely.
  2. Let engine idle for 5 seconds, then hold engine speed at 2000-3000 RPM until INCMP of CATALYST changes to CMPLT (it will take about 5 minutes).
  3. If CMPLT is not displayed, stop engine and cool to less than 158°F (70°C), then retest from step  1 . Select SELF-DIAG RESULTS mode with CONSULT-II.
  4. If 1st trip DTC is detected, go to DIAGNOSTIC PROCEDURE  . If 1st trip DTC is not detected, system is okay at this time.
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