Testing Condition

Before performing the following procedure, confirm that battery voltage is more than 11V at idle  .

With CONSULT-II 

1. Start engine and warm it up to 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. Select A/F SEN1 (B1) P1278/P1279 or A/F SEN1 (B1) P1288/P1289 of A/F SEN1 in DTC WORK SUPPORT mode with CONSULT-II.
   Fig 1: Displaying DTC P1278 & P1279 W/CONSULT-II (1 Of 3)

   Courtesy of NISSAN MOTOR CO., U.S.A.
6. Touch START.

   If COMPLETED appears on CONSULT-II screen, Go to step  10.

   If COMPLETED does not appear on CONSULT-II screen, Go to the following step.

7. After perform the following procedure, TESTING will be displayed on the CONSULT-II screen.
   Fig 2: Displaying DTC P1278 & P1279 W/CONSULT-II (2 Of 3)

   Courtesy of NISSAN MOTOR CO., U.S.A.
   1. Increase the engine speed up to 4,000 to 5,000 RPM and keep it for 10 seconds.
   2. Fully release accelerator pedal and then let engine idle for about 10 seconds.

      If TESTING is not displayed after 10 seconds  , refer to TROUBLE DIAGNOSIS - SPECIFICATION VALUE .

8. Wait for about 20 seconds at idle at under the condition that TESTING is displayed on the CONSULT-II screen.
9. Make sure that TESTING changes to COMPLETED.
   Fig 3: Displaying DTC P1278 & P1279 W/CONSULT-II (3 Of 3)

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

   If TESTING changed to OUT OF CONDITION  , refer to TROUBLE DIAGNOSIS - SPECIFICATION VALUE .

10. Make sure that OK is displayed after touching SELF-DIAG RESULT.

    If NG is displayed, Go to DIAGNOSTIC PROCEDURE .

With GST 

1. Start engine and warm it up to normal operating temperature.
2. Select MODE 1 with GST.
3. Calculate the total value of Short term fuel trim and Long term fuel trim indications.

   Make sure that the total percentage should be within +/-15%.

   If OK, Go to the following step.

   If NG, check the following.

   • Intake air leaks
   • Exhaust gas leaks
   • Incorrect fuel pressure
   • Lack of fuel
   • Fuel Injector
   • Incorrect PCV hose connection
   • PCV valve
   • Mass air flow sensor

4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and keep the engine speed between 3,500 and 4,000 RPM for at least 1 minute under no load.
6. Let engine idle for 1 minute.
7. Increase the engine speed up to 4,000 to 5,000 RPM and keep it for 10 seconds.
8. Fully release accelerator pedal and then let engine idle for about 1 minute.
9. Repeat steps from 4 to 8.
10. Select MODE 3 with GST and make sure that no DTC is displayed.

    If the DTC is displayed, Go to DIAGNOSTIC PROCEDURE .