Check Engine light

[sdesha]

Greetings entegra folks,

I am at home in Florida, decided to get the 30,000 mile service done. On my way home my check engine light kept coming on and going off.

SPN 167
FMI 18

Cummings fault code is i believe is 597

Electrical charging system voltage data valid but below normal operating range. Moderately Severe Level.

Does anyone have an idea what may be going on?

Thanks
Suzzanne
2014 Entegra Cornerstone
2015 Jeep Cherokee

[DebbieMH]

Call Spartan and ask them. Hope it’s simple.

[RVingNow]

charging voltage is low. I'd start with the alternator output voltage.

[wolfe10]

OK, what does your dash voltage gauge read???


Easiest place to troubleshoot the charging system is at the BATTERY ISOLATOR. Below ASSUMES you have a diode-based battery isolator. If solenoid-based isolator, it will be slightly different.



But, start by verifying that connections on the alternator, battery isolator and batteries are clean and tight. If a sense wire, which is small gauge, make sure it reads chassis battery voltage.


Start engine and raise RPM to around 1,200


Check voltage at the center lug (connected to alternator B+ terminal. It should be in the mid 14's VDC. The two outer lugs (one to each battery bank) should read around .6 VDC lower.


Whole diagnosis takes less than 10 minutes. Yes, you do need a digital voltmeter.

[sdesha]

It is the alternator

Suzzanne
2014 entegra cornerstone
2015 jeep Cherokee