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Home >> Lexus >> 2007 >> LS 460L >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (Engine Control System) >> DTC P0420, P0430: Three Way Catalyst Function >> Overall Function Check >> With GST
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With GST

WARNING: This page is about a different car, the 2004 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
  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 for 1 minute.
  5. Open engine hood.
  6. Set voltmeter probe between ECM terminals ECM terminals 74 [HO2S2 (bank 1) signal], 55 [HO2S2 (bank 2) signal] and body ground.
  7. Keep engine speed at 2,500 RPM constant under no load.
  8. Make sure that the voltage does not vary for more than 5 seconds.

    If the voltage fluctuation cycle takes less than 5 seconds, go to DIAGNOSTIC PROCEDURE  .

    • 1 cycle: 0.6 -1.0 --> 0 - 0.3 --> 0.6 - 1.0
    Fig 1: Checking Voltage Between ECM Terminals And Body Ground
    G00775407Courtesy of NISSAN MOTOR CO., U.S.A.
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