Question about 1987 Nissan Pickup

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No injector pulse

87 hardbody, good spark good fuel pressure, no ground pulse.

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  • Anonymous Mar 14, 2014

    2003 suzuki ignis no spark or injector pulse

  • Anonymous Mar 14, 2014

    no injector pulse or spark, 2003 suzuki ignis, M13A

  • Anonymous Mar 18, 2014

    what is wrong

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2 Answers

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  • Master
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Hello sir,

absence of ground pulse means there is some kind of shorting circuit in your control circuit.

which can make the ground pulse to get shorted there itself preventing it to reach the circuit properly.

thank you

don't forget to rate the solution

good day

Posted on May 27, 2008

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  • Nissan Master
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The electronic board that controls the injectors may be faulty, have it tested.

Posted on May 27, 2008

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1 Answer

Hi Oillyspil 2004 Nissan hardbody 2 litre petrol. Injectors pulse only once evertime i crank engine I have spark at plugs


Sorry, can't find your vehicle in my US automotive database. Is your vehicle sold in the US? I doubt I'll be able to look up any info or wiring diagrams.

The basics, I'd want to see if your losing voltage or ground for your fuel injectors. If you have two wires at the fuel injector, one is probably voltage and the other is probably ground, the ground is usually controlled by the computer.
If the computer won't ground the fuel injector circuit, check the security system, and check for rpm signal.

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I'd have to use a gage and check proper fuel pressure. Also, I'd have to check fuel injector pulse. The fuel injector needs voltage and ground.
If the computer doesn't see rpm signal, it won't ground the fuel injector. Sometimes the ignition module is at fault? There could be other issues? I hate to see you replace anything w/o testing.

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You would put on a new crank sensor because the ignition system won't work, it gives no spark. So now do you have spark at a spark plug wire end? A blue consistent spark? Probably good ignition system, as long as all spark plugs get a spark.

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With the injector circuit, the first thing to check is if each injector has power to it with the key in ON. One power wire and one ground wire goes to each injector. The power wire is from a fuse that is powered with key on or key in start, and then it is spliced to all of the injectors. The injector grounds all run into the engine computer, where the circuit can be internally grounded for a split second and cause the injector to pulse. But anytime the key is on, the injectors have steady voltage available to them.

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If ECU has crank signal and engine turns over, ECU should give injectors a pulse and trigger the ignition. If not ECU might be bad. You should check power and grounds going to ECU. There are usually multiple power and grounds going into ECU

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For a no start , cranks over ok. be sure you have fuel pressure at the fuel rail first, before checking the injectors. There should be more that 40 psi at the rail... if not .. you might have a fuel pump problem. Even if you have fuel pressure at the fuel rail... the next thing I would check for,,, is spark !! Make sure you have spark at the spark plugs. The order would be... fuel pressure first and then spark , , then injector pulse. !! Then plugged exhaust.... then bad fuel then engine timing. The injectors have power to them all the time. The PCM controls the ground to the injectors. So you would have to monitor the ground side of the injectors. So checking injectors is kinda complicated. Hope this helps you. Good luck.

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Then the fuel injectors are not pulsing,replace the crankshaft sensor,it controls the spark,but also the pulse for the injectors.

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