Not sure on cause of "ECM-1632 Alternator Faulty signal"

nonlipstick · Dec 6th, 2022, 11:38

Hi All,

I'm having some difficulties with my Volvo C30 (2008) relating to a faulty alternator signal and wondered if anyone had any ideas on a possible solution.

So essentially I've done:

Cleared code: ECM-1632 Alternator Faulty signal. Came back on after turning ignition off and on.

Tried switching alternator twice. Current one is a used volvo one for c30.

Changed battery to Bosch.

Changed alternator regulator fuse (under bonnet) - all seems fine there.

Checked some contacts on CEM under passenger side panel. Overall seems in really good condition.

I'm not sure what to do as a next step and wondered if anyone had any ideas.

Any help would be really appreciated. Thanks.

pinballdave · Dec 6th, 2022, 11:55

Depends which engine you've got. Some have digital alternator control via LIN bus from the CEM, the others have analogue control via a voltage from the ECU.

nonlipstick · Dec 6th, 2022, 17:37

Thanks for the reply, it's a 1.6 petrol. Is that enough info to determine the control type? Thanks again.

nonlipstick · Dec 27th, 2022, 10:20

Hi all, just wanted to check if anyone had any ideas on this one. Many thanks

Dec 6th, 2022, 11:38	#1
nonlipstick New Member Last Online: Dec 27th, 2022 10:20 Join Date: Dec 2022 Location: County Durham	Not sure on cause of "ECM-1632 Alternator Faulty signal" Hi All, I'm having some difficulties with my Volvo C30 (2008) relating to a faulty alternator signal and wondered if anyone had any ideas on a possible solution. So essentially I've done: Cleared code: ECM-1632 Alternator Faulty signal. Came back on after turning ignition off and on. Tried switching alternator twice. Current one is a used volvo one for c30. Changed battery to Bosch. Changed alternator regulator fuse (under bonnet) - all seems fine there. Checked some contacts on CEM under passenger side panel. Overall seems in really good condition. I'm not sure what to do as a next step and wondered if anyone had any ideas. Any help would be really appreciated. Thanks.

Dec 6th, 2022, 11:55	#2
pinballdave Member Last Online: Apr 23rd, 2024 11:30 Join Date: Nov 2017 Location: Brighton	Depends which engine you've got. Some have digital alternator control via LIN bus from the CEM, the others have analogue control via a voltage from the ECU.

Dec 6th, 2022, 17:37	#3
nonlipstick New Member Last Online: Dec 27th, 2022 10:20 Join Date: Dec 2022 Location: County Durham	Thanks for the reply, it's a 1.6 petrol. Is that enough info to determine the control type? Thanks again.

Dec 27th, 2022, 10:20	#4
nonlipstick New Member Last Online: Dec 27th, 2022 10:20 Join Date: Dec 2022 Location: County Durham	Hi all, just wanted to check if anyone had any ideas on this one. Many thanks

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