Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: For basic inspection, see BASIC INSPECTION under IDLE SPEED, IGNITION TIMING & IDLE MIXTURE RATIO ADJUSTMENT in ON-VEHICLE ADJUSTMENTS article, for ignition signal, see IGNITION SIGNAL CIRCUITS under IGNITION SYSTEM in SYSTEM & COMPONENT TESTING article and for intermittents, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

For diagnostic procedure, see Fig 1-Fig 3 .

Fig 1: Identifying Diagnostic Procedure For DTC P0420 Or DTC P0430: 3-Way Catalyst Function (Steps 1-4 Of 8)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 2: Identifying Diagnostic Procedure For DTC P0420 Or DTC P0430: 3-Way Catalyst Function (Steps 5-6 Of 8)

Courtesy of NISSAN MOTOR CO., U.S.A.

Fig 3: Identifying Diagnostic Procedure For DTC P0420 Or DTC P0430: 3-Way Catalyst Function (Steps 7-8 Of 8)

Courtesy of NISSAN MOTOR CO., U.S.A.