My suspicion is the ECU has gone haywire since the engine code shows 'operation failed'. The dealer says that this is the entire wiring harness. The ABS, Cluster and VECU all come up with codes which all show up to be a J1939 data link connector. Truck Paper is your go-to source for new and used trucks, trailers, and related equipment. After this happened, I checked the DTC's and when I go to the 128 Engine code section the 'operation failed' keeps coming up. The relay under the CB is clicking, the batteries have proper voltage and proper voltage at the starter but will not engage. Mack Trucks, Inc., is an American truck manufacturing company and a former manufacturer of buses and trolley buses. Turned the ignition switch off and back on to fire the truck back up, but the starter will not turn over. This truck does not do that like the newer ones do. If it does not have one, it sends the signal directly to the IMS to crank the truck. BODY BUILDER INSTRUCTIONS Mack Trucks Body Builder Engine, MP7, MP8, and MP10 PI / CHU, AN / CXU, GR / GU, TD LR, TE / MRU Section 2 Introduction This information provides details for the MP7, MP8, and MP10 engines for MACK vehicles.
The clutch switch sends an input to the Sam cabin, the sam sends the signal to the start enable relay located on the fender well, 'If it has one'.
All of the electronics and A/C were still on but the engine had shut down and no alarms. Starter relay located at the Sam Cabin behind the glove compartment, take 4 screws out to access. I left the truck idling to load a machine on the trailer and got ready to leave and noticed the truck had shut down. Has anyone ever gotten the message 'operation failed' when checking for diagnostic codes? Whenever I have checked for DTC codes in the past, if any were present, they have always came up with the proper code numbers.
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