Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Do you know if you have any codes?
How did you determine you have no spark?
If you have injector pulse, then your computer is getting the signal from the crank and cam sensor.
So I would double check to be sure your not getting spark.
PULLED COIL ON PLUG OUT AND INSTALLED SPARK TESTER INTO COIL
Other wise, you could be looking at a ecm
what kind of spark tester?
KD OFF THE MATCO TRUCK ALSO TRIED TO LOOK AT WAVEFORM OR SIGNAL FROM ECM AND CANT SEEM TO GET ANY
USING A VANTAGE SCOPE FROM SNAP ON
Well if you have injector pulse, you should be seeing some sort of signal
The pulse is given when the computer can determine engine position.
I HAVE INJECTOR PULSE BUT NO SPARK I EVEN HAD NISSAN TEC FROM DEALER HERE IN JAX COME DOWN AND CHECK WITH CONSULT BUT COULD NOT DETERMINE FIX
MOST TECHS ARE TELLING ME TIMING IS OFF BUT IF IT WAS WHY WOULD I HAVE INJECTOR PULSE AND NO SPARK ALSO THIS VEHICLE HAS NO SECURITY
Then I would start suspecting a Ecm problem if the timing is correct
WOULD YOU KNOW WHERE I CAN SEE A CAM AND CRANK WAVEFORM TOGETHER TO VERIFY MINE IS CORRECT
These engines are known to jump time, I would pop the top timing cover and valve cover off, and put the engine at TDC to verify the timing is correct
HAD THAT DONE A FEW DAYS AGO AND ALSO REPLACED INTAKE VVT GEAR ON CAM DUE TO ANOTHER TECH TOOK IT APART
Then if your timing is correct, then I can give you the ECM terminal layout and references to see if you can isolate a fault. But I would start suspecting a Ecm if the timing is correct.
WHAT TYPE OF SGNAL WOULD I LOOK FOR AT THE TRANSISTORS
I HAVE VERIFIED I HAVE 12 VOLTS AND GOOD GROUND AT ALL COILS BUT NOT SEEING ANY TURN ON FOR COIL
The Ecm has to see some sort of signal for it to produce injector pulse.
The injectors and the coils share the Cam and Crank sensor signal
to determine engine position and to help produce pulse and spark.
if your not getting spark, then I would suspect you may have a Ecm issue.
The Ecm's from 2000 to 2003 were known to have some issues, and did fail quite often.
CORRECT I AM WATCHING CAM AND CRANK SIGNALS (SQUARE WAVEFORMS ) BUT IF THEY DONT LINE UP CORRECTLY WOULD I LOOSE SPARK ONLY. I HAVENT FOUND ANY GOOD WAVEFORMS TO VIEW AND I HAVE TRIED A USED ECM FROM A DONER CAR AND HAVE THE SAME RESPONSE INJ. PULSE BUT NO SPARK
I would try checking all the ecm reference values to see if you find something out of spec. Click HERE to download it.
WILL TRY IN THE MORNING (HOPEFULLY SHOP HAS ADOBE SO I CAN SEE VALUES/REFERENCES
I am normally online in the evenings after 7pm
till 10 or 11 pm EST.