What causes no injector pulse and no spark?
The nature of the cause of no injector pulse is that there is no power input. The three main factors that lead to that condition are blown injector fuse, bad injector electrical relay, and bad wiring. If the fuse and relay are normal, you will need to check the cylinder without the injector pulse.
What sensor tells injectors to fire?
Electronic Control Unit (ECU) The ECU is the brain of the operation. It uses engine RPM and signals from different sensors to meter the fuel. It does this by telling the fuel injectors when and how long to fire. The ECU often controls other functions like the fuel pump and ignition timing.
Does crankshaft position sensor control injector pulse?
Crank Position Sensor, does control injector pulse AND ignition spark. Often these little buggers become intermittant. A little tap with a spanner will usually bring the sensor back online, but suggest to replace it ASAP.
What would cause a coil pack to not fire?
There are a few reasons for no spark, new coil pack could be defective, crank sensor, ignition module or bad wire in primary circuit, faulty ECM/PCM. You may have to have a good technician have a look, diagnose and estimate repair. Second link gives detailed instructions for testing and diagnosing coil pack.
Does crank sensor control injectors?
The crank position sensor also manages fuel injector function in vehicles with distributorless ignition systems. A failed crank position sensor may not trigger fuel injectors at all which will result in a no-start condition for the vehicle.
How do you check a fuel injector pulse?
Unplug the electrical connector from the fuel injector you want to test. Turn the ignition switch to the ON position. Touch the terminals (one at a time) of the harness connector with the test light. One of the terminals should make the test light glow, this is the injector power source coming from the computer.
What is injector pulse?
Injector pulse width is the amount of time, measured in milliseconds (ms), that a fuel injector stays open (delivers fuel) during a cylinder intake cycle. The typical injector pulse width for an idling engine at normal operating temperature is between 2.5 and 3.5 ms.
Can a crank sensor cause no injector pulse?
The crank sensor can cause no spark and no pulse to the injectors, however, it would be the ground side of the injector harness that was missing. You should still have 12v at the harness.
What are the symptoms of a failing crank sensor?
Symptoms of a Bad Crankshaft Position Sensor
- Your Check Engine Light is Blinking.
- It’s Difficult to Get Your Vehicle to Start.
- Your Vehicle is Stalling and/or Backfiring.
- The Engine is Making Your Vehicle Vibrate.