Fuel injectors not working

CHRISSHEETS1

MEMBER
2006 VOLVO S40
2.4L
5 CYL
2WD
AUTOMATIC
320,000 MILES

Hi,

Car listed above will crank, getting fire and gas, but the injectors are not kicking on. Checked everything that I was supposed to, but everything comes back normal, but the injectors won’t come on, and I can’t figure it out.

1 Reply

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Hi,

Is fuse 32 in the under-hood fuse box good? If you checked it, did you also check for power to and from the fuse?

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Next, here is how it works. Power to all injectors is constant from fuse 32 with the key in the run or start position. From there, the PCM provides a ground path at specific times to each of the injectors to complete the circuit and fire the injector.

I attached the wiring schematic below showing the power supply. It's highlighted. If you are not getting power there, it's between the fuse and injectors. If you are getting power, then it sounds like there is no ground path being provided by the PCM.

Let me know what you find.

Take care,

Joe

See pics below. The last pic identifies fuse location.

Images (Click to make bigger)