Mack PI64T M778 7093 SPN Fault Code

Name:

Engine Cylinder Head Bypass Actuator 1 Operation Status

Description:

Identifies the status of Engine Cylinder Head Bypass Actuator 1. Cylinder head bypass valve is used to release the air at the high pressure compressor outlet into turbocharger turbine inlet when intake pressure exceeds exhaust pressure at lower engine speeds and thereby controlling compressure surge. 0000b = Normal 0001b = Alarm (fully operational but needs service) 0010b = Alarm High Severity (functional but transient performance may be reduced) 0011b = Derate Active (torque output reduced due to environmental conditions) 0100b = Controlled Shutdown Active (driving to the default position – usually this means closed) 0101b = Uncontrolled Shutdown Active (no torque is being applied from the actuator) 0110b = Calibration in Progress (must be broadcast at least once per calibration process defined in SPN 3464) 0111b to 1101b = Reserved for future assignment 1110b = Error 1111b = Not available

Mack PI64T M778 7093 spn fault code name is Engine Cylinder Head Bypass Actuator 1 Operation Status. If you don't take the time to look into Mack PI64T M778 7093 spn fault when it arises, it can add up quickly. One small issue like Mack PI64T M778 7093 can cause a larger component to become damaged without taking the time to investigate. If you suspect your truck is suffering from one of these issues, look into replacing those small components to save money down the road.

Note: The name and description of Mack PI64T M778 7093 code represents text descriptions for faults supported by another coding system and does not necessarily comply with SAE J1939. For a specific engine manufacturer's explanation for codes, please consult the engine's technical manual. See also other spn codes.

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