Procedure For Malfunction B

Use this procedure to check the overall function of the mass air flow sensor circuit. During this check, a 1st trip DTC might not be confirmed.

With GST

1. Start engine and warm it up to normal operating temperature.
2. Select Service $01 with GST.
3. Check the mass air flow sensor signal with Service $01.
   Fig 1: Generic Scan Tool Display - Mass Air Flow Sensor Signal Value

   Courtesy of NISSAN MOTOR CO., U.S.A.
4. Check for linear mass air flow sensor signal value rise in response to increases to about 4,000 rpm in engine speed.
5. If NG, go to "DIAGNOSIS PROCEDURE ".