Mack Granite Engine Brake Not Working

Federal and canada motor vehicle safety standards mvss 106 brake hoses and 121 air brake systems.

Mack granite engine brake not working.

About a month ago it quit working entirely. Brake solenoid is fuse 2 in the engine compartment i have not found any fuses in the engine compartment. The multimeter model i use to troubleshoot listed on the amazon affiliate link listed right here. The j tech engine brake is activated by the v mac system.

To properly diagnose electrical problems with the brake an ammeter may be required. Battery switches 2 3 50. 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. I got the oil changed and that didnt help.

I have not checked the power. 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. The model of this truck ctp713. 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.

Battery switches 1 3 49 cd urea dosing system 22 ne additional ign. I looked at the schematic it says the fuse for the comp. I did find one with a loose connection for the sol. 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.

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. 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. Any change or addition to the system may cause the vehicle to no longer be in compliance with. Engine brake is not working properly checking the solenoids for movement and replacing the o ring gaskets.