Power interruption error code 5A

[puddinboo]

I'm leaning towards the ABS module on this one.

I'm only getting 1 code 5A power interruption error, I clear the code and it comes back instantly without driving. Just idling. Using Foxwell NT 510.

FYI Battery voltage sitting 12.3v,load voltage cranking engine, 10.2v
Alternator voltage 13.1 idling,13.7v at 2000 rpms for 20sec or so.

Any thoughts on this ?

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[X5chemist]

Voltage seems a little low. Put a charger on it overnight. Clear the codes and check again. Check the ABS module connector. The code is a brief power interruption as far I know.

[puddinboo]

I keep a battery maintainer( CTEK MXS 5.0) on all the time I'm not driving X.

1 Thing I noticed with the Foxwell monitoring voltage while running it's reading 11.7v to max 12.4v. But when I check voltage directly at the battery I get higher readings like in my previous thread?

Where and how hard is it to access the plug for the ABS module? I tried looking but couldn't find it. M54 3.0i engine.

Originally Posted by X5chemist

Voltage seems a little low. Put a charger on it overnight. Clear the codes and check again. Check the ABS module connector. The code is a brief power interruption as far I know.

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[wpoll]

Originally Posted by puddinboo

... 1 Thing I noticed with the Foxwell monitoring voltage while running it's reading 11.7v to max 12.4v. But when I check voltage directly at the battery I get higher readings like in my previous thread? ...

Might be time to check the B+ connections in the trunk (on the BST and on the B+ distribution fuse panel), as well as the B+ at the front bulkhead (B+ jumper terminal) - those voltages are too low even for a reading on a diag system or the BC display.

[puddinboo]

Here's the lights on the dash.

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[puddinboo]

At the 2 jumper locations under the hood I am getting 13.1v with engine idling, 13.7 - 14v with engine at 2000 RPM's, battery with no load sitting at 12.1v at -10c.

Originally Posted by wpoll

Might be time to check the B+ connections in the trunk (on the BST and on the B+ distribution fuse panel), as well as the B+ at the front bulkhead (B+ jumper terminal) - those voltages are too low even for a reading on a diag system or the BC display.

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[andrewwynn]

Originally Posted by puddinboo

1 Thing I noticed with the Foxwell monitoring voltage while running it's reading 11.7v to max 12.4v. But when I check voltage directly at the battery I get higher readings like in my previous thread?

The vBat with fox should read 13.6 ± 0.3

Yours is entirely too low and should trip your trifecta and basically the fruit salad of lights you are seeing.

This is almost always a voltage regulator issue. Most will replace the whole alternator when this happens. I replaced my slip rings and brushes.

[puddinboo]

I agree fox should see higher values,I question I have is why my meter reads between 13v and 14v while running.I'm confused.also I have I checked the voltage at 12v source on console and I'm getting readings between 13v and 14 v while running. I haven't checked voltage on dash yet though. When I get a chance I'll hook up inpa sometime.

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[andrewwynn]

Because you aren't checking b+ while driving however there is one more possibly that lines up with some of your symptoms:

B+ bolt loose. Lift the cover over the aft side of the firewall and check if the bolt going through to b+ is loose. It's how I disconnect power when working on starter/alternator and 1-2x a year somebody on xo discovers their B+ bolt is loose


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[puddinboo]

Thank you for the info I will check that out and update you this week.Also I will check more closely for corrosion around B+ also.

Originally Posted by andrewwynn

Because you aren't checking b+ while driving however there is one more possibly that lines up with some of your symptoms:

B+ bolt loose. Lift the cover over the aft side of the firewall and check if the bolt going through to b+ is loose. It's how I disconnect power when working on starter/alternator and 1-2x a year somebody on xo discovers their B+ bolt is loose


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