Paccar

Reason:EGR Valve Control Circuit Calculated Over Temperature – Data Valid But Above Normal Operational Range – Least Severe Level. High EGR valve driver temperature has been detected. Effect:Possible reduced engine performance Circuit Description:The exhaust gas recirculation (EGR) valve is controlled by a brushless motor located on top of the EGR valve. The EGR valve motor uses three different motor legs to move the valve through its range of motion. The ECM uses the EGR motor A, B, and C wires to command the EGR valve to the appropriate position in order to meet EGR flow targets.The EGR valve motor contains...

Reason:VGT Actuator Driver Over Temperature (Calculated) – Data Valid But Above Normal Operating Range – Least Severe Level. High internal VGT actuator temperature has been detected. Effect:None on performance. Circuit Description:The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports malfunctions back to the primary engine ECM, using the J1939 data link. The ECM then decodes the error message and converts it to a fault code. Component...

Reason:VGT Actuator Driver Over Temperature (Calculated) – Data Valid But Above Normal Operating Range – Least Severe Level. High internal VGT actuator temperature has been detected. Effect:None on performance. Circuit Description:The variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device and receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports malfunctions back to the primary engine ECM, using the J1939 data link. The ECM then decodes the error message and converts it to a fault code. Component...

Reason:Aftertreatment Fuel Shutoff Valve 1 – Mechanical System Not Responding Properly or Out of Adjustment. The aftertreatment fuel shutoff valve has been detected to be stuck closed. Effect:Possible reduced engine performance. Circuit Description:Before active regeneration of the aftertreatment DPF, a diagnostic test on the system is performed. The aftertreatment fuel injector opens and relieves fuel pressure in the line. The aftertreatment fuel pressure sensor must be reading atmospheric pressure at this point in the test. The aftertreatment fuel drain valve closes. The aftertreatment fuel shutoff valve and aftertreatment fuel injector then close and trap the fuel between the aftertreatment fuel...

Reason:Coolant Level – Data Valid But Below Normal Operational Range – Moderately Severe Level. Low engine coolant level detected. Effect:Possible reduced engine performance. Circuit Description:The coolant level sensor is a switch and is used to measure the level of the engine coolant in the radiator top tank. The coolant level sensor is immersed in the coolant and returns a different signal voltage when immersed in coolant versus being out of coolant. The engine control module (ECM) monitors the change in the signal voltage to determine the level of the engine coolant. Component Location:The engine coolant level sensor is typically located...