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Reason:Aftertreatment Diesel Exhaust Fluid Line Heater 3 Circuit – Voltage below normal, or shorted to low source. Low 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...

Reason:Aftertreatment Diesel Exhaust Fluid Line Heater 3 Circuit – Current Below Normal or Open Circuit. Open circuit detected in the diesel exhaust fluid line heater 3. 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 is commanded ON. Conditions...

Reason:Engine Control Module Warning Internal Hardware Failure – Bad Intelligent Device or Component. ECM power supply errors have been detected. Effect:Possible reduced engine performance. Circuit Description:The engine control module (ECM) receives constant voltage from the batteries through the unswitched battery wires that are connected directly to the positive (+) battery post. The ECM receives switched battery input through the vehicle keyswitch wire when the vehicle keyswitch is turned ON. Component Location:The ECM is connected to the battery by the OEM harness. This direct link provides a constant power supply for the ECM. The location of the battery will vary with...

Reason:Anti-Lock Braking (ABS) Controller – Abnormal Update Rate. No communication or an invalid data transfer rate has been detected on the J1939 data link between the ECM and the anti-lock braking (ABS) controller. 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...

Reason:Transmission Output Shaft Speed – Data Valid but Above Normal Operating Range – Moderately Severe Level. High auxillary speed signal frequency has been detected. Effect:Engine power derate. Circuit Description:The external speed command input circuit provides a means to govern the engine independent of engine speed. This circuit controls output shafts or other devices downstream of a torque converter. Component Location:The external speed command input circuit location varies with the original equipment manufacturer (OEM). Refer to the OEM service manual. Conditions for Running the Diagnostics:This diagnostic runs continuously when the keyswitch is in the ON position. Conditions for Setting the Fault...