Diagnostic Procedure

Visually check exhaust tubes and muffler for dent.

OK or NG 

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

1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 1.

Fig 1: Checking Exhaust Gas Leak Before Three Way Catalyst 1

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: Testing Condition - Ignition Timing

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

OK or NG 

1. OK: GO TO 5.
2. NG: Follow the Basic Inspection .

1. Stop engine and then turn ignition switch ON.
2. Check voltage between ECM terminals 21, 22, 23, 40, 41, 42 and ground with CONSULT-II or tester.

   Refer to Wiring Diagram for Injectors, Wiring Diagram .

   1. Battery voltage should exist. 

OK or NG 

1. OK: GO TO 6.
2. NG: Perform Diagnostic Procedure .

Fig 3: Checking Voltage Between ECM Terminals 21, 22, 23, 40, 41, 42 And Ground With CONSULT-II

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

1. Turn ignition switch OFF.
2. Disconnect ignition coil assembly from rocker cover.
3. Connect a known-good spark plug to the ignition coil assembly.
4. Disconnect injector harness connectors.
5. Place end of spark plug against a suitable ground and crank engine.
6. Check for spark.

OK or NG 

1. OK: GO TO 7.
2. NG: Check ignition coil with power transistor and their circuit.

   Refer to IGNITION SIGNAL .

Fig 4: Connecting Spark Plug To Ignition Coil For Checking Spark

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

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

   Refer to FUEL INJECTOR AND FUEL TUBE .

   Keep fuel hose and all injectors connected to injector gallery.

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

   Make sure fuel does not drip from injector.

OK or NG 

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