Operation and maintenance manual

Electronic Controlled Fuel System QSB4.5 and QSB6.7
Page 1-8 Section 1 - Operating Instructions
The ECM communicates with service tools and some
other vehicle controllers such as transmissions, antilock
brake system, and antislip reduction through an SAE
J1939 data link.
Some vehicles and equipment will have J1939 networks
on them that link many of the "smart" controllers together.
Vehicle control devices can temporarily command engine
speed or torque to perform one of the devices' functions,
such as transmission shifting or antilock braking.
The control system uses a number of sensors to provide
information on engine operating parameters. These
sensors include:
• Coolant temperature sensor
• Intake air pressure and temperature sensor
• Barometric pressure sensor
• Oil pressure switch
• Engine speed sensor
• Engine position sensor
• Water-in-fuel sensor
• Rail pressure sensor.
The following inputs are provided by OEM-selected
devices:
• Accelerator pedal position sensor
• Idle validation switch
• Engine coolant level sensor
• Vehicle speed sensors
• Feature control switches (i.e., cruise control switches)
• Fan control switch
• Air conditioner pressure switch
• Remote accelerator
• Remote PTO .
NOTE: These inputs are application-dependent. Some
applications will not use all of these inputs.