Component Function Check

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.

1. INSPECTION START 

   Turn ignition switch OFF, and restart engine.

   Does the engine start?

   YES

   With CONSULT: GO TO 2.

   YES

   Without CONSULT: GO TO 3.

   NO

   Refer to Diagnosis Procedure .

2. CHECK IGNITION SIGNAL FUNCTION 

   With CONSULT

   1. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT.
   2. Make sure that each circuit produces a momentary engine speed drop.

   Is the inspection result normal?

   YES

   INSPECTION END

   NO

   Refer to Diagnosis Procedure .

3. CHECK IGNITION SIGNAL FUNCTION 

   Without CONSULT

   1. Let engine idle.
   2. Read the voltage signal between ECM harness connector terminals under the following conditions with an oscilloscope.

      ECM				Voltage signal
      +		-
      Connector	Terminal	Connector	Terminal
      F111	114	M132	147	Courtesy of NISSAN NORTH AMERICA, INC.
      	103
      	107
      	106
      	104
      	113

      NOTE: The pulse cycle changes depending on RPM at idle.

   Is the inspection result normal?

   YES

   INSPECTION END

   NO

   Refer to Diagnosis Procedure .