Diagnostic Procedure

1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body.

   Refer to "GROUND INSPECTION ".

   Fig 1: Locating Body Ground Screws

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

OK or NG 

1. OK : GO TO 2.
2. NG : Repair or replace ground connections.

1. Disconnect A/F sensor 1 harness connector.
   Fig 2: Locating A/F Sensor 1 Banks 1/2 And Connectors

   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 

1. OK : GO TO  4.
2. NG : GO TO 3.
   Fig 3: Identifying Voltage Between Connector Terminal 3 and 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

1. : 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 .

   TERMINALS CONTINUITY CHART
   
   

   	A/F sensor 1 terminal	ECM terminal
   Bank 1	1	16
   	2	75
   	5	35
   	6	56
   Bank 2	1	76
   	2	77
   	5	57
   	6	58

   Continuity should exist. 

4. Check harness continuity between the following terminals and ground.

   Refer to WIRING DIAGRAM .

   TERMINALS CONTINUITY CHART
   
   

   Bank 1		Bank 2
   A/F sensor 1 terminal	ECM terminal	A/F sensor 1 terminal	ECM terminal
   1	16	1	76
   2	75	2	77
   5	35	5	57
   6	56	6	58

   Continuity should not exist. 

5. Also check harness for short to power.

OK or NG 

1. OK : GO TO 5.
2. 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 

1. OK : GO TO 6.
2. NG : Repair or replace.

Replace air fuel ratio (A/F) sensor 1.

1. : INSPECTION END