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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0420, P0430: Three Way Catalyst Function >> Overall Function Check >> With GST

With GST

WARNING: This page is about a different car, the 2013 Nissan Armada. 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 probes between ECM terminals ECM terminals 55 [HO2S2 (bank 1) signal], 74 [HO2S2 (bank 2) signal] and 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  "DIAGNOSIS PROCEDURE ".

    • 1 cycle: 0.6 - 1.0 → 0 - 0.3 → 0.6 - 1.0
      Fig 1: Measuring Voltage Between ECM Terminals 55, 74 And Ground
      G08690594Courtesy of NISSAN NORTH AMERICA, INC.