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No injector pulse on volvo S70

M

milmatoro

New member
Joined
Apr 19, 2018
My volvo s70 has no injector pulse. The problem started when i replaced the turbo due to continuous smoking.

On my trouble shooting, i have spark, good fuel pressure, crank sensor seems oky i can even read the rpm on the engine on OBD2 scanner.

The vehicle would start for just 2 seconds and shut off. I therefore removed the fuel rail with injectors attached then cranked the engine, i saw that the injectors would just spray fuel once, thus one full cycle and stops. Hence starting for just 2seconds. I then grounded the pulse wires to the injectors then they all sprayed. To me it was an indication of good fuel pressure.

I am suspecting the ECU because i tested for continuity on the pulse wire from ecu to the injectors and it was good.
Who anyone help me with a different opinion at solving the problem at hand.i am now clueless:oops:.
 
I forgot to mention that the injectors have got constant 12v power supply. Anyone who might have encounted such a problem please help
 
Cam sensor. The crank sensor determines engine speed but the cam sensor is used for injector sequencing during startup. Common failure with age, won't necessarily throw a CEL.
 
gsellstr said:
Cam sensor. The crank sensor determines engine speed but the cam sensor is used for injector sequencing during startup. Common failure with age, won't necessarily throw a CEL.
Click to expand...

That could be true, I will have to take out the cam sensor and replace it.
 
tryingbe said:
Did you test the fuel injector relay near the radiator fan relay?
Click to expand...

I am not sure if that is the fuel injector relay grey plastic in colour and that is were the fan is also connected.

As it stands I have not yet tested it if thats the one your are referring to, over snd above that my fan is not kicking on when I am cranking like it used to be. if that grey thing is the relay, it might also be a root caur of my problem.
 
milmatoro said:
Any idea on how best to test it, or the most appropriate testing method
Click to expand...

The oscilloscope is my preferred tool. My Hantek scope was $80. Instead of spending $30 on fuel and sweating in the junkyard, one could test the sensor.

Another test method uses the multimeter: measure resistance and look for an open or possibly some huge amount of resistance.

Or try your luck with an LED test light. I would expect blinking, or a solid green light (depending on you light).

What is a logic probe?

Google fu:

http://www.aa1car.com/library/crank_sensors.htm
 
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