Diagnostic Procedure

1. Turn ignition switch OFF
2. Loosen and retighten ground three screws on the body
   Fig 1: DTC P1272, P1282 Checking Ground Connections

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

   Refer to GROUND INSPECTION .

OK or NG

OK: GO TO 2.

NG: Repair or replace ground connections.

1. Disconnect A/F sensor 1 harness connector
   Fig 2: Identifying A/F Sensor 1 Harness Connector

   Courtesy of NISSAN MOTOR CO., U.S.A.
2. Turn ignition switch ON
3. Check voltage between A/F sensor 1 terminal 3 and ground with CONSULT-II or tester

   Voltage: Battery voltage 

OK or NG

OK: GO TO  4.

NG: GO TO 3.

Fig 3: Checking Voltage Between A/F Sensor 1 Terminal 3 & Ground

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

Check the following.

• Harness connectors E5, F14
• IPDM E/R harness connector E119
• 10A fuse
• Harness for open or short between A/F sensor 1 and fuse

  : Repair or replace harness or connectors.

1. Turn ignition switch OFF
2. Disconnect ECM harness connector
3. Check harness continuity between A/F sensor 1 terminal and ECM terminal as follows. Refer to Wiring Diagram
   Fig 4: Checking Harness Continuity Between A/F Sensor 1 Terminal & ECM Reference Table (1 Of 2)

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

   Continuity should exist. 

4. Check harness continuity between the following terminals and ground. Refer to Wiring Diagram
   Fig 5: Checking Harness Continuity Between A/F Sensor 1 Terminal & ECM Reference Table (2 Of 2)

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

   Continuity should not exist. 

5. Also check harness for short to power

OK or NG

OK: GO TO 5.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

Perform TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

OK or NG

OK: Replace A/F sensor 1.

NG: Repair or replace.