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I have a SAE J1708/J1587 data link/DATA ERRATIC error on my…

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Hello. I have a SAE...
Hello. I have a SAE J1708/J1587 data link/DATA ERRATIC error on my 2005 Volvo vnl 780. Cummins isx motor. Truck works just fine but has lost RPM, Speed, Oil Pressure, Oil Temp, Coolant Temp gauges. This happened right after multiple ENGINE ECU (200 plus) and ABS errors that have since been fixed.
Submitted: 1 year ago.Category: Medium and Heavy Trucks
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Answered in 7 hours by:
2/24/2021
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago
roybelding
roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
Satisfied Customers: 12,915
Experience: Shop Froeman for Freightliner Trucks
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Hello, my name is ***** ***** sorry to see you are having issues. Give me a couple of minutes to review your issue and I will assist you

Roy

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Customer reply replied 1 year ago
Thanks
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

Good morning

I would start by cleaning the battery cables and load testing the batteries. Low voltage is a common cause for this.

Check the charging system as well. You should have 14 to 14.5 volts. Then test AC volts as well.

Roy

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Customer reply replied 1 year ago
I do have 14.1 volts with ac and lights on
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

OK, how much AC voltage with the engine running?

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Customer reply replied 1 year ago
Cleaned up the ground terminal and sprayed terminal cleaner on all other terminals14.2
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

14.2 AC volts?

Did you remove the cables and clean them?

Roy

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Customer reply replied 1 year ago
I don't have a gauge for ac voltsJust cleaned the ground with wire brush
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

Then how did you measure the charging voltage you posted?

No, the cables must be removed and cleaned.

Roy

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Customer reply replied 1 year ago
I have a regular voltage gauge
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

You need to get a voltmeter that can read AC volts and you need to remove the cables and clean them correctly.

Roy

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Customer reply replied 1 year ago
How many ac volts should it be in a system working correctly
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

0. If it has any more than that, the alternator is no good.

Roy

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Customer reply replied 1 year ago
Interestingthe alternator can send out ac voltage to my batteriesWhile still charging
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

Correct. A bad diode inside fails.

Roy

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Customer reply replied 1 year ago
any amount of ac current through off the ECM?It's a 16 year old alternator
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

200 codes were originally posted. That would be the reason for that.

Yes, the ECM does not know AC voltage, only DC.

Roy

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Customer reply replied 1 year ago
Can I do follow up with you on this number
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

ON this post, yes you can

Roy

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Customer reply replied 1 year ago
Ok. Thanks
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

You are welcome

Roy

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Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

Where was that?

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Customer reply replied 1 year ago
Qualcomm cable in the back of the cab. I cut it and errors cleared. My gauges are back
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

You have a water leak back there.

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Customer reply replied 1 year ago
WeatherIt's been out of use for 12 years
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

That will do it.

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Customer reply replied 1 year ago
Evidently
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

Yep

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Customer reply replied 1 year ago
Thanks for your lead on the alternator diodeI will keep a voltmeter in the truck
Technician: roybelding, Shop Foreman Freightliner trucks replied 1 year ago

You are welcome

Roy

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roybelding, Shop Foreman Freightliner trucks
Category: Medium and Heavy Trucks
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