Diagnostic Procedure

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.

For A/F sensor (sensor 1) circuit wiring diagram, see Figure . For diagnostic procedure, see Fig 1 -Fig 3 . For A/F sensor heater component inspection, see Figure .

For PCM location and connector terminal identification, see Figure and Figure . For engine control components locations, see Figure -Figure . For vacuum or EVAP hose routing, see VACUUM DIAGRAMS article. For testing of systems or components, see BASIC DIAGNOSTIC PROCEDURES article or SYSTEM & COMPONENT TESTING article. For adjustments, see ON-VEHICLE ADJUSTMENTS article. For removal and installation of components, see REMOVAL & INSTALLATION article.

Fig 1: DTC P1278 Or DTC P1279 Diagnostic Procedure (Steps 1-4)

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

Fig 2: DTC P1278 Or DTC P1279 Diagnostic Procedure (Step 5)

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

Fig 3: DTC P1278 Or DTC P1279 Diagnostic Procedure (Steps 6-10)

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