New batteries, 58v FICM, new ICP sensor?

[zacdiesel01]

I have done swamps 58v FICM, new batteries and a new ICP sensor and my insight is telling me the The FICM voltage is 47. It drops to about 43 or so when I start it in the morning. What else could this be? Or is it ok? Thanks guys

[howell_jd]

I don't think it is ok but I would encourage you to share this with Swamps for a better and more precise troubleshooting drill especially if this is a recent incident.

Jonathan

[codyrock87]

I believe that the upgraded ficm is supposed to show your computer that the voltage is 48 to avoid any fault codes or issues. The voltage will be slightly lower for a minute or two while the glow plugs are on, check after it has ran for about 5 mins

[zacdiesel01]

Thank you I'll do that.

[howell_jd]

Independent of any reprogramming of the reported voltage through the OBDII port, measurement at the FICM itself will confirm immediately your readings via the Insight. A reading of 43V falls below the lower threshold of 45V in the operational range. Low voltage may not fully actuate the coils in the fuel injectors resulting in subsequent damage. Achieving greater than 45V eventually is not an indication of a fully functional FICM which is why the test involves three conditions: key on/engine off, cranking, and key on/engine running. An answer on the reprogramming via OBDII would be validated/invalidated by Swamps easily.

Jonathan

[zacdiesel01]

Thank you very much