Circuit DescriptionSensor supply 4 of the engine control module (ECM) provides a 5 VDC supply to the accelerator pedal position sensor. Component LocationThe accelerator pedal or lever position sensor is mounted to the accelerator pedal assembly. Refer to the OEM service manual. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the sensor supply 4 signal voltage was greater than 5.25-VDC for more than 1 second. Action Taken When the Fault Code is ActiveThe ECM illuminates...

Circuit DescriptionSensor supply 4 of the engine control module (ECM) provides a 5 VDC supply to the accelerator pedal position sensor. Component LocationThe accelerator pedal or lever position sensor is mounted to the accelerator pedal assembly. Refer to the OEM service manual. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the sensor supply 4 signal voltage was less than 4.75-VDC for more than 1 second. Action Taken When the Fault Code is ActiveThe ECM illuminates...

Circuit DescriptionThe engine control module (ECM) provides a 5 volt supply to the intake manifold pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The intake manifold pressure sensor provides a signal to the ECM on the intake manifold pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the intake manifold. Component LocationThe intake manifold 1 pressure/temperature sensor is located in the air intake manifold. Conditions for Running the DiagnosticsThis diagnostic consists of two parts: One part runs immediately after the keyswitch is turned OFF, and...

Circuit DescriptionThe 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 LocationThe VGT actuator is located on the turbocharger bearing housing. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the...

Circuit DescriptionThe barometric pressure sensor responds to pressure changes in the atmospheric pressure. The pressure changes occur based on the elevation where the engine is presently operating. The barometric pressure sensor has a 5 volt supply circuit, a sensor signal voltage, and a return circuit. Component LocationThe barometric pressure sensor is mounted on the main branch of the engine harness near the ECM. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running. Conditions for Setting the Fault CodesThe Engine Control Module (ECM) detected the barometric air pressure...