2015 Gateway Module Diagnostics

timc930 · Jul 14, 2022

Can anyone tell me the following on a 2014-16 SCV6, (needs to be the cars with Dual Battery Start/Stop)

1) Alternator output (correct) at the Field Wire Terminal on the back of the Alt (Engine Running)? I am showing 6V which seems low, but just don't know what it should be.

2) Live Data (Engine Running) within the GWM Diagnostic Live Data for the Alternator Field Wire? I am showing 0A.

This will help me in my troubleshooting.

timc930 · Jul 14, 2022

So I ran external wire from Alternator Field Terminal to GWM, and was able to clear Alternator/Battery DTC within the GWM, and dashboard faults cleared as well. After codes were cleared my values are as follows:

1) Alt direct output at Field Wire Terminal, no connection to GWM: 12.5V
2) Alt output at Field Wire when connected to GWM: 8V
3) Real Time Alternator Field Current from GWM Diagnostics: 2.74V

After all the troubleshooting looks like I have a wire issue between GWM C2531L-4 and C2725L-16, as I'm getting a lot of resistance (43ohms).

I'll update the other thread as well.

2015 Gateway Module Diagnostics

timc930

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timc930

Full Access Member

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