Mack Granite Engine Brake Not Working

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Mack granite engine brake not working.

The j tech engine brake is activated by the v mac system. I noticed about 2 months ago it would not work all the time only once and a while. Battery switches 2 3 50. I got the oil changed and that didnt help.

Any change or addition to the system may cause the vehicle to no longer be in compliance with. I do have a fuse panel on top of the dash and one at the kick panel by the drivers door but it does not have a label. To properly diagnose electrical problems with the brake an ammeter may be required. Federal and canada motor vehicle safety standards mvss 106 brake hoses and 121 air brake systems.

I looked at the schematic it says the fuse for the comp. When the ignition switch is turned on the engine brake solenoids are supplied a constant 12 volt direct current with current flow increasing whenever the engine brake is activated. Ca engine interface mp 11 19 na o ignition battery sw spare connection 47 cb o dpf regeneration system 20 nb junction posts 48 cc engine heater 21 nc additional ign. About a month ago it quit working entirely.

Battery switches 1 3 49 cd urea dosing system 22 ne additional ign. I have not checked the power. The reason for high cutting out and only low working is that the engine brake is not getting the required oil pressure to function properly. I was talking to another driver today who drives a granite he says there is an oil pressure line that controls the engine brake and there is a small valve in that line that gets gummed up.

I did find one with a loose connection for the sol. As manufactured by mack trucks inc the air brake system on mack chassis both incomplete and complete comply with the applicable requirements of u s. Brake solenoid is fuse 2 in the engine compartment i have not found any fuses in the engine compartment. The model of this truck ctp713.