A/T Models Except ULEV

CHECK FOR EXHAUST AIR LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust air leak before three way catalyst (manifold).
  
  Fig 1: Checking For Exhaust Air Leak
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 2.
2. NG: Repair or replace.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector and ECM harness connector.
3. Check harness continuity between ECM terminals and A/F sensor 1 terminals as follows.
  Refer to WIRING DIAGRAM .
  
  Fig 2: Identifying Air Fuel Ratio (A/F) Sensor 1
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Fig 3: ECM & A/F Sensor Terminal Specifications
  Courtesy of NISSAN MOTOR CO., U.S.A.
  
  Continuity should exist.
4. Check harness continuity between ECM terminals 16, 35, 56, 75 and ground, or A/F sensor 1 terminals 1, 2, 5, 6 and ground.
  Refer to WIRING DIAGRAM .
  
  Continuity should not exist.
5. Also check harness for short to ground and short to power.
OK or NG
1. OK: GO TO 3.
2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
CHECK FUEL PRESSURE
1. Release fuel pressure to zero. Refer to FUEL PRESSURE RELEASE .
2. Install fuel pressure gauge and check fuel pressure.
  At idling: Approximately 350 kPa (3.57 kg/cm ² , 51 psi)
OK or NG
1. OK: GO TO 5.
2. NG: GO TO 4.
DETECT MALFUNCTIONING PART
Check the following.
- Fuel pump and circuit (Refer to FUEL PUMP CIRCUIT .)
OK or NG
1. OK: Replace fuel pressure regulator.
2. NG: Repair or replace.
CHECK MASS AIR FLOW SENSOR
With CONSULT-II
1. Install all removed parts.
2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-II.
  at idling: 1.4 - 4.0 g.m/sec
  
  at 2, 500 RPM: 5.0 - 10.0 g.m/sec
With GST
1. Install all removed parts.
2. Check mass air flow sensor signal in MODE 1 with GST.
  at idling: 1.4 - 4.0 g.m/sec
  
  at 2, 500 RPM: 5.0 - 10.0 g.m/sec
OK or NG
1. OK: GO TO 6.
2. NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or engine grounds. Refer to "DTC P0101 MAF SENSOR ".
CHECK FUNCTION OF INJECTORS
With CONSULT-II
1. Start engine.
2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-II.
3. Make sure that each circuit produces a momentary engine speed drop.
  
  Fig 4: Identifying Active Test Mode Of Consult-II
  Courtesy of NISSAN MOTOR CO., U.S.A.
Without CONSULT-II
1. Start engine.
2. Listen to each injector operating sound.
  Clicking noise should be heard.
  
  Fig 5: Checking Function Of Injectors (Without Consult-II)
  Courtesy of NISSAN MOTOR CO., U.S.A.
OK or NG
1. OK: GO TO 7.
2. NG: perform trouble diagnosis for "INJECTOR CIRCUIT ".
CHECK INJECTOR
1. Remove injector assembly. Refer to "FUEL INJECTOR AND FUEL TUBE ". Keep fuel hose and all injectors connected to injector gallery.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all injector harness connectors.
  The injector harness connectors should remain connected.
4. Disconnect all ignition coil harness connectors.
5. Prepare pans or saucers under each injectors.
6. Crank engine for about 3 seconds.
  Make sure fuel does not drip from injector.
OK or NG

OK (Does not drip.): GO TO 8.

NG (Drips.): Replace the injectors from which fuel is dripping. Always replace O-ring with new one.
CHECK INTERMITTENT INCIDENT
Perform "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".
1. INSPECTION END