Need some help troubleshooting a crank no start issue. I tried a search, but didn't find what I was looking for so if this has been asked before please let me know.
Anyway...
99 K1500 5.7 is cranking, but not starting. The steps I've taken so far are:
1) Tested fuel pressure - 55psi.
2) Tested for spark at all the cylinders - nothing.
3) Tested for spark from the coil to the cap - nothing.
4) Tested voltage to coil and ICM - good at 12V.
5) Checked signal from ICM to coil - good continuity.
6) Swapped coils with known good one, twice - nothing.
7) Swapped ICM with known good one - nothing.
8) Checked switching signal from PCM to ICM - on with key in off position.
So, I stopped there because based on what I understand the switching signal is only suppose to be on when the engine is rotating. Why would it be on if the key is off?
Anyway...
99 K1500 5.7 is cranking, but not starting. The steps I've taken so far are:
1) Tested fuel pressure - 55psi.
2) Tested for spark at all the cylinders - nothing.
3) Tested for spark from the coil to the cap - nothing.
4) Tested voltage to coil and ICM - good at 12V.
5) Checked signal from ICM to coil - good continuity.
6) Swapped coils with known good one, twice - nothing.
7) Swapped ICM with known good one - nothing.
8) Checked switching signal from PCM to ICM - on with key in off position.
So, I stopped there because based on what I understand the switching signal is only suppose to be on when the engine is rotating. Why would it be on if the key is off?