07-12-2018 06:16 PM
We have been instructed just to replace the ECM module next time it goes down as it doesnt appear to be a high cost item. The internal battery cannot be changed out it seems. Will try post an update when i know we have had success.
07-12-2018 11:27 AM
There have been few instances involving the ECM internal battery but it probably could cause your issue. I don't know of any published procedure to replace the ECM battery. If this is the cause of your issue, how have your resolved it?
07-12-2018 03:08 AM
Using your advice, I had a look into it and here are some updates.
We do have the latest AFR modules which are oil filled and do not have the moisture problems that the previous models did have (also now standard to use metal spacers for mounting with these models). The issue most likely seems to be the ECM which has a internal battery that is performing poorly. So when the machine is offline for a period of time, the ECM drops the atmospheric calibration causing the machine not to start.
06-26-2018 07:59 PM
You should have the latest pressure module which is part number 388-1307. This has all the latest changes. You should be able to calibrate the pressure module yourself without having to call a dealer service tech. There are no restrictions to prevent a customer from performing this calibration, using ET and the procedure in the Troubleshooting Manual.
One thing that could be an issue is if moisture is getting into the module, either from the air or fuel sensor tubing where it is connected. Also, if the pressure module is located on an outside engine, the pressure module will do better if it is protected from rain. It shouldn't need this, if you have the latest part number.
If you have the latest part number module, I would contact your Cat dealer Technical Communicator and ask for help from the Cat service rep, using your history of issues with this current module on the engine.
06-26-2018 07:00 PM
We had a G3608 serviced near end of last year. Since the service, the AFR Module (Gold Brick) has been loosing its true atmospheric pressure settings to give us a true zero for fuel pressure in the fuel rail when the unit is offline. The unit then wont start as it sees pressure in the fuel rail. We have pulled the drain plugs out to double check and the module still sees 2.2-5kPa in the fuel rail.
The issue occurs when the unit and the MIDS panel is turned off for a period of about 8 hours. To rectify, we need to plug the laptop in or get a CAT tech out to reconfigure the settings for the AFR controller. This gets it going but it will fail again next time the unit is shutdown. Has anyone seen this before?
Things to note:
We have replaced the gold brick 3 times since the end of last year service.
Before the service, the gold brick was soft mounted. Since the service, the new installation is hard mounted (as advised by supplier). The G3608 unit next to it is soft mounted still and has had no issues. Has the design for the AFR modules been changed recently?
Vibration levels look normal since service.
Looking forward to your feeback.