Lamp:Amber Reason:An incorrect oxygen sensor reading has been detected by the aftertreatment intake NOx sensor. Effect:None on performance. Circuit Description:The aftertreatment intake NOx (Nitrogen Oxides) sensor is a smart device and communicates with the Engine Control Module (ECM) via the J1939 data link. The aftertreatment intake NOx sensor performs internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment intake NOx sensor is used to measure the NOx emissions...

Circuit DescriptionThe turbocharger compressor intake temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the compressor intake of the turbocharger. The engine control module (ECM) supplies 5-VDC to the compressor intake temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the air temperature. Component LocationThe turbocharger compressor intake temperature sensor is located in the compressor inlet of the turbocharger. Conditions for Running the DiagnosticsThis diagnostic consists of two parts: The first part runs when the keyswitch is turned to...

Lamp:None Reason:Open circuit or high voltage detected at the engine brake solenoid number 3 signal circuit. Effect:Possible reduce engine braking performance. Circuit Description:The Engine Control Module (ECM) controls engine braking on cylinders 1 and 2 by sending a signal to engine brake solenoid 1. The ECM controls engine braking on cylinders 3 and 4 by sending a signal to engine brake solenoid number 2. The ECM controls engine braking on cylinders 5 and 6 by sending a signal to engine brake solenoid 3. Component Location:The engine brake solenoids are located under the valve cover. The engine brake solenoids are controlled...

Circuit DescriptionThe crankshaft position and camshaft position sensors are Hall effect type sensors. The engine control module (ECM) provides a 5 volt supply to the position sensor and a return circuit. As the teeth on the crankshaft speed ring or the dimples in the back of the camshaft gear move past the position sensor, a signal is generated on the position sensor signal circuit. The ECM interprets this signal and converts it to an engine speed. A missing tooth on the crankshaft gear is used by the ECM to determine the position of the engine. Component LocationThe crankshaft position and...

Lamp:None Reason:Signal indicates wrong reading or sensor tampering. Effect:None on performance. Circuit Description:The aftertreatment outlet NOx (Nitrogen Oxides) sensor is a smart device and communicates with the Engine Control Module (ECM) via the J1939 data link. The aftertreatment outlet NOx sensor performs its own internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment outlet NOx sensor is used to measure the NOx emissions at the outlet of the...