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Reason:Intake Manifold 1 Temperature – Data Valid But Below Normal Operational Range – Moderately Severe Level. The intake manifold temperature is below a critical threshold Effect:None on performance. Circuit Description:The Engine Control Module (ECM) provides 5 volts to the intake manifold temperature signal circuit, and monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature. When the intake air is cold, the sensor (or thermistor) resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to a ground. Therefore, the ECM senses a high...

Reason:Idle Shutdown Vehicle Accessories Relay Driver Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected at the idle shutdown vehicle accessory or ignition bus relay circuit when commanded ON. Effect:Vehicle accessories or ignition bus loads controlled by the idle shutdown relay will not power up. Circuit Description:The Engine Control Module (ECM) Idle Shutdown feature has an optional parameter for a shutdown accessory relay. When this parameter is set to “Installed”, the ECM sends a signal to energize the relay and turn off vehicle accessories during idle shutdown events. The idle shutdown relay return circuit varies by...

Reason:Transmission Output Shaft Speed – Received Network Data In Error. The J1939 multiplexing controller has indicated a malfunction of the transmission output shaft speed sensor. Effect:None on performance. Circuit Description:Normally, switches, accelerators, and other components are connected to the engine control module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an original equipment manufacturer (OEM) vehicle electronic control unit (VECU) or transmission electronic control unit (ECU) in the cab. Then component values and states from components such as sensors, accelerators, and switches can be transmitted from the OEM VECU to the Cummins® ECM...

Reason:Transmission Output Shaft Speed – Received Network Data In Error. The J1939 multiplexing controller has indicated a malfunction of the transmission output shaft speed sensor. Effect:None on performance. Circuit Description:Normally, switches, accelerators, and other components are connected to the engine control module (ECM) directly through individual wires. Multiplexing allows those same components to be hard wired to an original equipment manufacturer (OEM) vehicle electronic control unit (VECU) or transmission electronic control unit (ECU) in the cab. Then component values and states from components such as sensors, accelerators, and switches can be transmitted from the OEM VECU to the Cummins® ECM...

Reason:Aftertreatment Diesel Exhaust Fluid Line Heater 3 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the diesel exhaust fluid line heater 3 circuit. Effect:Possible reduced engine performance. Circuit Description:The aftertreatment diesel exhaust fluid line heaters are used to defrost and/or prevent freezing of the diesel exhaust fluid lines. Component Location:The aftertreatment diesel exhaust fluid line heater 3 is located on the suction line between the diesel exhaust fluid tank and diesel exhaust fluid dosing unit. Conditions for Running the Diagnostics:This diagnostic runs when the keyswitch is in the ON position and line heating...