Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.

CHECK FOR INTAKE AIR LEAK AND PCV HOSE
1. Start engine and run it at idle speed.
2. Listen for the sound of the intake air leak.
3. Check PCV hose connection.
OK or NG

OK: GO TO 2.

NG: Repair or replace.
CHECK FOR EXHAUST SYSTEM CLOGGING
Stop engine and visually check exhaust tube, three way catalyst and muffler for dents.

OK or NG

OK: GO TO 3.

NG: Repair or replace.
PERFORM POWER BALANCE TEST
With CONSULT-III
1. Perform "POWER BALANCE" in "ACTIVE TEST" mode.
2. Is there any cylinder which does not produce a momentary engine speed drop?
Without CONSULT-III

When disconnecting each fuel injector harness connector (1) one at a time, is there any cylinder which does not produce a momentary engine speed drop?

Fig 1: Identifying Fuel Injector Harness Connector
Courtesy of NISSAN MOTOR CO., U.S.A.

Yes or No

Yes: GO TO 4.

No: GO TO 9.
CHECK FUEL INJECTOR
Does each fuel injector make an operating sound at idle?

Yes or No

Yes: GO TO 5.

No: Check fuel injector(s) and circuit(s). Refer to "FUEL INJECTOR ".

Fig 2: Checking Fuel Injector Operating Sound
Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUNCTION OF IGNITION COIL-I
CAUTION: Do the following procedure in the place where ventilation is good without the combustible.
1. Turn ignition switch OFF.
2. Remove fuel pump fuse (1) in IPDM E/R (2) to release fuel pressure.
  NOTE: Do not use CONSULT-III to release fuel pressure, or fuel pressure applies again during the following procedure.
  
  <==: Vehicle front
  
  Fig 3: Identifying IPDM E/R And Fuel Pump Fuse
  Courtesy of NISSAN MOTOR CO., U.S.A.
3. Start engine.
4. After engine stalls, crank it two or three times to release all fuel pressure.
5. Turn ignition switch OFF.
6. Remove all ignition coil harness connectors to avoid the electrical discharge from the ignition coils.
7. Remove ignition coil and spark plug of the cylinder to be checked.
8. Crank engine for 5 seconds or more to remove combustion gas in the cylinder.
9. Connect spark plug and harness connector to ignition coil.
10. Fix ignition coil using a rope etc. with gap of 13 - 17 mm between the edge of the spark plug and grounded metal portion as shown in the figure.
11. Crank engine for about 3 seconds, and check whether spark is generated between the spark plug and the grounded metal portion.
  Spark should be generated.
  
  Fig 4: Identifying Gap Between Edge Of Spark Plug And Grounded Metal Portion
  Courtesy of NISSAN MOTOR CO., U.S.A.
  CAUTION:
  - Do not approach to the spark plug and the ignition coil within 50cm. Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20kV or more.
  - It might cause to damage the ignition coil if the gap of more than 17 mm is taken.
  NOTE: When the gap is less than 13 mm, the spark might be generated even if the coil is malfunctioning.
OK or NG

OK: GO TO 9.

NG: GO TO 6.
CHECK FUNCTION OF IGNITION COIL-II
1. Turn ignition switch OFF.
2. Disconnect spark plug and connect a known-good spark plug.
3. Crank engine for about 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.
  Spark should be generated.
OK or NG

OK: GO TO 7.

NG: Check ignition coil, power transistor and their circuits. Refer to "IGNITION SIGNAL ".
CHECK SPARK PLUG
Check the initial spark plug for fouling, etc.

OK or NG

OK: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "CHANGING SPARK PLUGS ".

NG:
1. Repair or clean spark plug.
2. GO TO 8.
  
  Fig 5: Identifying Spark Plug Tip
  Courtesy of NISSAN MOTOR CO., U.S.A.
CHECK FUNCTION OF IGNITION COIL-III
1. Reconnect the initial spark plugs.
2. Crank engine for about three seconds, and recheck whether spark is generated between the spark plug and the grounded portion.
  Spark should be generated.
OK or NG

OK: INSPECTION END

NG: Replace spark plug(s) with standard type one(s). For spark plug type, refer to "CHANGING SPARK PLUGS ".
CHECK COMPRESSION PRESSURE
Check compression pressure. Refer to "CHECKING COMPRESSION PRESSURE ".

OK or NG

OK: GO TO 10.

NG: Check pistons, piston rings, valves, valve seats and cylinder head gaskets.
CHECK FUEL PRESSURE
1. Install all removed parts.
2. Release fuel pressure to zero. Refer to "FUEL PRESSURE RELEASE ".
3. Install fuel pressure gauge and check fuel pressure. Refer to "FUEL PRESSURE CHECK ".
  At idling: Approximately 350 kPa (3.57 kg/cm ² , 51 psi)
OK or NG

OK: GO TO 12.

NG: GO TO 11.
DETECT MALFUNCTIONING PART
Check the following.
- Fuel pump and circuit (Refer to "FUEL PUMP ".)
- Fuel pressure regulator (Refer to "FUEL PRESSURE CHECK ".)
- Fuel lines (Refer to "FUEL INJECTOR AND FUEL TUBE ".)
- Fuel filter for clogging
: Repair or replace.

CHECK IGNITION TIMING

Check the following items. Refer to "BASIC INSPECTION ".

ITEMS SPECIFICATIONS

Items	Specifications
Target idle speed	CVT: 800 ± 50 RPM (in P or N position)
Target idle speed	M/T: 650 ± 50 RPM (in Neutral position)
Ignition timing	CVT: 10 ± 5° BTDC (in Neutral position)
Ignition timing	M/T: 10 ± 5° BTDC (in Neutral position)

OK or NG

OK: GO TO 13.

NG: Follow the "BASIC INSPECTION ".

CHECK AIR FUEL RATIO (A/F) SENSOR 1 CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
- Air fuel ratio (A/F) sensor 1 (Bank 1) harness connector (1)
- Air fuel ratio (A/F) sensor 1 (Bank 1) (2)
- Air fuel ratio (A/F) sensor 1 (Bank 2) (3)
- Air fuel ratio (A/F) sensor 1(Bank 2) harness connector (4)
Disconnect ECM harness connector.

Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .

Fig 6: Identifying Air Fuel Ratio Sensor 1 Harness Connector

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

ECM TERMINAL REFERENCE

Bank	A/F sensor 1 terminal	ECM terminal
1	1	45
1	2	49
2	1	53
2	2	57

Continuity should exist.

Check harness continuity between the following terminals. Refer to WIRING DIAGRAM .

TERMINALS CONTINUITY CHART

Bank 1		Bank 2
A/F sensor terminal	ECM terminal	A/F sensor terminal	ECM terminal
1	45	1	53
2	49	2	57

Continuity should not exist.

Also check harness for short to power.

OK or NG

OK: GO TO 14.

NG: Repair open circuit or short to ground or short to power in harness or connectors.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER
Refer to "COMPONENT INSPECTION ".

OK or NG

OK: GO TO 16.

NG: GO TO 15.
REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
- Discard any A/F sensor which has been dropped from a height of more than 0.5 m (19.7 in) onto a hard surface such as a concrete floor; use a new one.
- Before installing new A/F sensor, clean exhaust system threads using Oxygen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.
: INSPECTION END
CHECK MASS AIR FLOW SENSOR
With CONSULT-III
1. Start engine and warm it up to normal operating temperature.
2. Check mass air flow sensor signal in "DATA MONITOR" mode with CONSULT-III.
  At idling : 1.0 - 4.0 g.m/sec
  
  At 2, 500 RPM : 2.0 - 10.0 g.m/sec
With GST
1. Start engine and warm it up to normal operating temperature.
2. Check mass air flow sensor signal in Service $01 with GST.
  At idling : 1.0 - 4.0 g.m/sec
  
  At 2, 500 RPM : 2.0 - 10.0 g.m/sec
OK or NG

OK: GO TO 17.

NG: Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or ground. Refer to "DTC P0101 MAF SENSOR ".
CHECK SYMPTOM MATRIX CHART
Check items on the rough idle symptom in "SYMPTOM MATRIX CHART ".

OK or NG

OK: GO TO 18.

NG: Repair or replace.
ERASE THE 1ST TRIP DTC
Some tests may cause a 1st trip DTC to be set.

Erase the 1st trip DTC from the ECM memory after performing the tests. Refer to "HOW TO ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION ".

: GO TO 19.
CHECK INTERMITTENT INCIDENT
Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

: INSPECTION END