Diagnostic Procedure

Visually check exhaust tubes and muffler for dent.

OK or NG 

1. OK: GO TO 2.
2. NG: Repair or replace it.

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst (manifold).
   Fig 1: Checking Exhaust Gas Leak

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

OK or NG 

1. OK: GO TO 3.
2. NG: Repair or replace.

Listen for an intake air leak after the mass air flow sensor.

OK or NG 

1. OK: GO TO 4.
2. NG: Repair or replace.

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

Fig 2: Adjustment Specifications

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

OK or NG 

1. OK: GO TO 5.
2. NG: Adjust ignition timing.

1. Refer to WIRING DIAGRAM  for Injectors, WIRING DIAGRAM .
2. Stop engine and then turn ignition switch ON.
3. Check voltage between ECM terminals 102, 104, 106, 109, 111 and 113 and engine ground with CONSULT-II or tester.

   Battery voltage should exist. 

OK or NG 

1. OK: GO TO 6.
2. NG: Perform "INJECTOR CIRCUIT ".
   Fig 3: Check Voltage Between ECM Terminals 102, 104, 106, 109, 111 And 113 And Engine Ground

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

1. Turn ignition switch OFF.
2. Disconnect ignition wire from spark plug.
3. Connect a known good spark plug to the ignition wire.
4. Place end of spark plug against a suitable ground and crank engine.
5. Check for spark.

OK or NG 

1. OK: GO TO  8.
2. NG: GO TO 7.
   Fig 4: Checking For Spark

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

1. Inspect wires for cracks, damage, burned terminals and for improper fit.
2. Measure the resistance of wires to their distributor cap terminal.

   Move each wire while testing to check for intermittent breaks.

   Resistance: 

Fig 5: Wire Resistance Specifications

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

Fig 6: Checking Resistance Between Ignition Wires And Distributor Cap

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

If the resistance exceeds the above specification, inspect ignition wire to distributor cap connection. Clean connection or replace the ignition wire with a new one.

OK or NG 

1. OK: Check ignition coil, power transistor and their circuits. Refer to "IGNITION SIGNAL ".
2. NG: Replace.

1. Turn ignition switch OFF.
2. Remove injector assembly.

   Refer to "OUTER COMPONENT PARTS ".

   Keep fuel hose and all injectors connected to injector gallery.

3. Disconnect all ignition coil harness connectors.
4. Turn ignition switch ON.

   Make sure fuel does not drip from injector.

OK or NG 

1. OK (Does not drip): GO TO 9.
2. NG (Drips): Replace the injector(s) from which fuel is dripping.

Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

1. Trouble is fixed: INSPECTION END 
2. Trouble is not fixed: Replace three way catalyst (manifold).