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Why ECU is not pulsing the injectors? - Cars & Trucks

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Could be several different things.
What is the make model and year, and what have you checked so far ?

Posted on Mar 27, 2015

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Posted on Jan 02, 2017

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Can ignition module cause engine to have no injector pulse even though it has spark


injector pulse from ECU

the ECU will have fault codes stored internally to find the cause

would check other sensors first
crank angle sensor or cam angle sensor could stop the pulse
immobilizer

if the engine cranks over and has spark
ignition would be the last thing i would checkout

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blown fuse. ; is first, as per always.
2nd is scan it, did you scan it yet? that is always 2nd.
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you said pulse,does that mean fuel pulse or electronic pulse to injector coil..... ? all injectors dead. or just 1. same for spark.
toss coin land, noid dead. all noids
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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

Jan 06, 2014 | Cars & Trucks

1 Answer

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I have a 1988 300zx non turbo 3.0 just replaced the ecu thinking it was the problem but its not. My car will turn over and it sparks, tested the fuel pressure and it makes 42lbs so thats not the problem...


The pulse to switch the coils comes from the crankshaft sensor via the ecu. Pulse to switch injectors comes from the CAMshaft sensor via the ecu. Check injector wiring plugs and confirm there is an ignition live of 12v at one side. Other side should have an earth pulse when cranking.Once you know which is missing you can trace the fault backwards. ( if no ignition live then check wiring, relay, fuse etc) if no earth switching check camshaft sensor and wiring.

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1 Answer

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Hi I have a 1995 C200 Auto Sedan chs WDB 2020202F241703, I think I have a problem in the ECU. Only runs on two cylinders, I have changed the core pack on the 1 & 4 cylinders but the problem persists. The other problem is I don't know where the ECU (engine computer ?) is can anyone help ?

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1 Answer

ECU of my Hyundai Scoupe 1994 2 doors cannot trigger the sequence of the fuel injectors to supply gas or petrol into the combustion chambers but spark is available to the spark plugs! can you help me solve...


The ECU requires timing pulses from the crankshaft and camshaft sensors in order to generate the injector pulses. All other sensors just modify the pulse width of the injectors to adjust for power and economy. If the ignition is entirely controlled from a distributor, the two above sensors would not affect the spark. Hope this helps!

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