Lamp:Red Reason:Unknown fluid inside DEF tank. Effect:Engine power derate. Circuit Description:The aftertreatment Diesel Exhaust Fluid (DEF) sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment DEF sensor performs its own internal diagnostics and reports malfunctions back to the primary Engine Control Module via the J1939 datalink. The aftertreatment DEF sensor monitors the tank level, temperature and quality of the DEF fluid. Component Location:The aftertreatment diesel exhaust fluid (DEF) sensor is located in the aftertreatment DEF tank. Location of the tank and sensor is OEM dependent. Conditions for Running the Diagnostics:This diagnostic runs continuously...

Lamp:Amber Reason:The temperature increase across the aftertreatment diesel oxidation catalyst is lower than expected. Effect:1. None on performance.2. Active and stationary regeneration of the diesel particulate filter will be disabled. Circuit Description:The aftertreatment exhaust gas temperature sensor module is a smart device that communicates with the engine control module via the J1939 data link. The aftertreatment exhaust gas temperature sensor module performs its own internal diagnostics and reports malfunctions back to the engine control module using the J1939 data link. The aftertreatment exhaust gas temperature sensor module is used to measure the aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel...

Lamp:Amber Reason:Low current or an open circuit has been detected at the diesel exhaust fluid tank level sensor. Effect:Possible reduced engine performance. Circuit Description:The aftertreatment Diesel Exhaust Fluid (DEF) sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment DEF sensor performs its own internal diagnostics and reports malfunctions back to the primary engine control module via the J1939 datalink. The aftertreatment DEF sensor monitors the tank level, temperature and quality of the DEF fluid. The aftertreatment diesel exhaust fluid tank level sensor is used to monitor the aftertreatment diesel exhaust fluid level inside...

Lamp:Red Reason:Intake manifold pressure is below the minimum operating limit. Effect:Possible reduced engine performance. Circuit Description:The 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 Location:The intake manifold 1 pressure/temperature sensor is located in the air intake manifold. Conditions for Running the Diagnostics:This diagnostic runs...

Lamp:Amber Reason:High fuel rail pressure detected. Effect:Engine may run rough, may stop running, may not start, or may be difficult to start. Circuit Description:The Engine Control Module (ECM) provides a 5 volt supply to the fuel rail pressure sensor using a dedicated sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The fuel rail pressure sensor provides a primary fuel pressure signal to the ECM on the fuel rail pressure sensor signal 1 circuit. The sensor also provides a secondary fuel pressure sensor signal on the fuel rail pressure signal 2 circuit. This sensor signal...