Buzzing at CCRM

I had someone ask me if I knew what would cause a buzzing at the CCRM. They said the engine would turn over fine, but it wouldn't start and there was a buzzing at the CCRM. If anyone has ever experinced this please let me know what the problem was.

Given that the CCRM is full of relays I would guess that one of them is making the noise. Its either bad or not getting enough voltage. Swapping in another CCRM would be a good start, just to see if it works.

The CCRM that was in his car worked fine in another car.

This buzz can be caused (I've seen this happen in person) by a bad ground. Most likely it is the ground at the little black box on the negative battery terminal.

OK, this is really wierd. The guy told me that the car was not firing and that the buzzing would stop when he removed the fuse to the fuel injector. He said that he removed and re-plugged the fuel injector fuse about 10 times and the car started. So I guess there was corosion on the fuse and/or fuse holder contacts that was keeping it from getting full power. The thing I don't understand is why it wouldn't fire if it was the fuel injector fuse??? Can any one explain this??? I would like to know why.

i have delt with this bc my car was blowing fuel injc fuses and it turned out to be my alt but the fuel injc fuse powers the ecu through a relay in the ccrm and it powers multiple sensors in the engine bay before it gets to the ecu.

A demotivational poster for ya:


PERCUSSIVE MAINTENANCE
Sometimes, when the thing's broken, and you're faced with
replacing it, whacking the thing actually *does* work.