Cumminz

Circuit DescriptionThe variable geometry turbocharger (VGT) is electronically activated by the VGT actuator. The VGT actuator is a smart device that receives information via the J1939 data link from the primary engine control module (ECM). The VGT actuator performs its own diagnostics and reports errors back to the primary engine ECM using the J1939 data link. Component LocationThe VGT actuator is located on the turbocharger bearing housing. Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is initially turned to the ON position. The keyswitch must be completely turned off for more than 30 seconds before this diagnostic can...

Circuit DescriptionThe exhaust gas temperature is calculated by the electronic control module (ECM). Exhaust gas temperature is derived by the ECM, based on engine operating conditions such as intake manifold air temperature, engine speed, injection timing, intake manifold pressure, and fuel flow. Component LocationThere is not a physical exhaust gas temperature sensor in the system. The exhaust gas temperature is a calculation of exhaust gas temperature before the turbocharger and is also known as turbine inlet temperature. Note: Some original equipment manufacturers (OEMs) have pyrometer gauges mounted in their chassis. Pyrometers measure turbine outlet temperature or the exhaust gas leaving...

Circuit DescriptionThe ambient air temperature sensor is used by the electronic control module (ECM) to monitor ambient air temperature. This can be used to sense the temperature inside the cab of a vehicle or the air temperature outside of the vehicle. The ambient air temperature signal is used by the ECM for the Idle Shutdown Ambient Air Temperature Override feature. The ambient air temperature sensor is used by the ECM to monitor the ambient air temperature. The ambient air temperature sensor is a thermistor and changes resistance based on the temperature being measured. The ECM provides a 5 volt reference...

Circuit DescriptionThe oil level sensor will monitor the oil fluid level in the oil pan at key ON. The oil level sensor will not monitor the oil level after the engine is started or when the engine speed is greater than 0 rpm. During engine key ON, if the oil level sensor detects a critical low oil level, then the amber CHECK ENGINE lamp will blink for 30 seconds and a fault code will be logged. If an operator observes a blinking amber CHECK ENGINE lamp at key ON, the operator must check the engine oil level with the manual...

Circuit DescriptionAn algorithm in the electronic control module (ECM) calibration monitors engine oil level while the ECM is keyed on and no engine speed is detected. If the engine oil level falls below a certain threshold, the ECM will activate Fault Code 253. Component LocationThe engine oil level sensor is located on the engine oil dipstick, on the air intake side of the engine. Conditions for Running the DiagnosticsThis diagnostic runs when the keyswitch is in the ON position and the engine speed is 0 rpm. Conditions for Setting the Fault CodesThe engine oil level is detected to be very...