Diagnostic Trouble Codes Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

WITH CONSULT-II

Start engine and warm it up to normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Turn ignition switch ON and select "SELF-LEARNING CONT" in "WORK SUPPORT" mode with CONSULT-II.
Clear the self-learning control coefficient by touching "CLEAR".
Select "DATA MONITOR" mode with CONSULT-II.

Start engine again and let it idle for at least 10 minutes.

The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go to DIAGNOSTIC PROCEDURE .

Fig 1: CONSULT-II Display - Work Support Mode

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

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.

Turn ignition switch OFF and wait at least 10 seconds.
Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the FREEZE FRAME DATA DETAIL - DTC P0171 & P0174 table.

Hold the accelerator pedal as steady as possible.

The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

FREEZE FRAME DATA DETAIL - DTC P0171 & P0174

Engine speed	Engine speed in the freeze frame data +/- 400 rpm
Vehicle speed	Vehicle speed in the freeze frame data +/- 10 km/h (6 MPH)

Fig 2: Freeze Frame Data Detail Chart - Engine Coolant Temperature

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

If it is difficult to start engine at step 6, the fuel injection system has a malfunction, too.
Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE .
If engine does not start, check exhaust and intake air leak visually.

WITH GST

Start engine and warm it up to normal operating temperature.
Turn ignition switch OFF and wait at least 10 seconds.
Disconnect mass air flow sensor harness connector.
Restart engine and let it idle for at least 5 seconds.
Stop engine and reconnect mass air flow sensor harness connector.
Select Service $03 with GST. Make sure DTC P0102 is detected.
Select Service $04 with GST and erase the DTC P0102.
Start engine again and let it idle for at least 10 minutes.
Select Service $07 with GST. The 1st trip DTC P0171 or P0174 should be detected at this stage, if a malfunction exists. If so, go to DIAGNOSTIC PROCEDURE .

Fig 3: Locating Mass Air Flow Sensor
Courtesy of NISSAN MOTOR CO., U.S.A.

NOTE: If 1st trip DTC is not detected during above procedure, performing the following procedure is advised.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Start engine and drive the vehicle under the similar conditions to (1st trip) Freeze Frame Data for 10 minutes. Refer to the table in Fig 4.
  Hold the accelerator pedal as steady as possible.
The similar conditions to (1st trip) Freeze Frame Data means the vehicle operation that the following conditions should be satisfied at the same time.

Fig 4: Freeze Frame Data Detail Chart - Engine Coolant Temperature & Vehicle Speed
Courtesy of NISSAN MOTOR CO., U.S.A.
If it is difficult to start engine at step 8, the fuel injection system has a malfunction.
Crank engine while depressing accelerator pedal. If engine starts, go to DIAGNOSTIC PROCEDURE .
If engine does not start, check exhaust and intake air leak visually.