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  1. smj999smj
    Sep 13th, 2013 07:16 AM - permalink
    (continued) If that's okay, then the ground wire circuit will need to be checked for continuity between the injector and ECU for an open circuit, excessive resistance within the circuit or a short. If that's okay, the ECU grounds should all be checked. If those are good, it is likely the ECU is defective.
  2. smj999smj
    Sep 13th, 2013 07:16 AM - permalink
    Reprogramming doesn't fix a bad ECU. Reprogramming is performed when the manufacturer (in this case Nissan) has issued an updated software program to fix a particular issue. Usually it's a matter of changing the values or range limits for engine sensors (ie O2 sensors). Also, ECU's don't "burn fuel." They make calculations on sensor inputs and then drivers in the ECU create a timed pulse for the ground wire from the fuel injectors. What I would do is get a "noid light" for Bosch style fuel injectors to see if the injectors are "firing." The light simply plugs into the fuel injector harness connector and will "flash" while the engine is cranking if the injector is being "fired." If it doesn't flash, the next step would be to use a 12v test light and make sure there is power at the fuel injector harness connector.
    Sep 13th, 2013 06:13 AM - permalink
    we got another ecu that was now sending the right signal to the coil packs, but this ecu wasnt burning fuel, so ignition kicks but does not start. but i was told the exact same thing by a friend, that ecu,s failing are very uncommon. what what ill do is have the ecu diagnosed and see whether it can be remapped or reprogrammed!! ill keep you posted on
  4. smj999smj
    Sep 12th, 2013 06:48 AM - permalink
    Sounds like you have a bad coil pack; does it have individual coils (aka "coil-on-plug")? What is the stored code? Nissan ECU's obviously can fail, but it's pretty uncommon.
    Sep 12th, 2013 05:13 AM - permalink
    thanks so much, im in kenya n i cant say that we have really good techs here. with my ecu the car actually starts but its not sending a signal to one of the spark plugs, its sluggish and the MIL is on. so i was told i MUST get another one. some say a diagnostic tool can reset this, some say get another ecu.
  6. smj999smj
    Sep 11th, 2013 06:40 AM - permalink
    I'm in the USA, so I can't speak for the ECU's in your country. We didn't get the B15 until the year 2000. The 99 B14 had the GA16DE and the ECU would just plug and play, if it was the correct one. In 2000, when our B15 arrived, it had the QG18DE or the SR20DE. These cars had immobilizer systems and programmable ECU's. The needed the key initialized to the ECU using a CONSULT II or later scantool or the vehicle would not start. On the plus side, you could replace the program on the ECU with the correct one for that vehicle (let's say you bought a used one), but you still needed a CONSULT II or later scantool and access to Nissan's ASIST terminal to download the ECU software program.
    Sep 10th, 2013 10:49 PM - permalink
    the ecu has many serial numbers that we do not know which ones to match or if we have to match all of them. my engine being a qg15de, if i find another 1999 sunny b15, will its ecu work on mine? and is it plug n play? thank you?
  8. smj999smj
    Sep 10th, 2013 01:13 PM - permalink
    You need the correct ECU for your particular model, engine, trans, and emissions certification.
    Sep 10th, 2013 09:01 AM - permalink
    hope im not a bother. i have a 1999 sunny b15. im having computer box/ ecu difficulties. are these components interchangeable between other b15 cars or do i need a specific one for my car.
  10. smj999smj
    Aug 19th, 2013 11:51 PM - permalink
    Most common causes for EGR codes are usually a burnt up and leaking BPT hose, a bad EGR control solenoid valve and/or built up carbon on the intake manifold or the small EGR pipe from the manifold to the BPT valve. I can't tell you what your mechanic did.

  About Me

  • About smj999smj
    2006 Pathfinder LE
    Former Certified Nissan Master Technician, 1985-2003.
    Prospect, VA
    Corrections Officer/Auto Technician/Truck driver


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  • Last Activity: Mar 14th, 2014 03:00 AM
  • Join Date: Jan 1st, 2006


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Mar 24th, 2014
02:45 PM - sillingworth mentioned smj999smj in post Never Again!
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Mar 14th, 2014
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Dec 29th, 2013
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