Cumminz

Circuit DescriptionThe coolant temperature sensor is a variable resistor sensor and is used to measure the temperature of the coolant of the engine. The engine control module (ECM) supplies 5 volts to the coolant temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the coolant temperature. The engine coolant temperature value is used by the ECM for the engine protection system and for engine emissions control. This fault code indicates that the engine coolant temperature has exceeded the engine protection limit. Component LocationThe engine coolant temperature sensor is...

Circuit DescriptionThe intake manifold 1 temperature sensor is a variable resistor sensor and is used to measure the temperature of the air entering the intake manifold of the engine. The electronic control module (ECM) supplies 5 volts to the intake manifold temperature signal circuit. The ECM monitors the change in voltage caused by changes in the resistance of the sensor to determine the intake manifold temperature. When the intake air is cold, the sensor or thermistor resistance is high. The ECM signal voltage only pulls down a small amount through the sensor to a ground. Therefore, the ECM senses a...

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 pressure/temperature 1 sensor is located in the air intake manifold. The barometric pressure sensor can be externally mounted on the engine or can be an internal component within the ECM. Check...

Circuit DescriptionFor an air assisted SCR system, the aftertreatment diesel exhaust fluid dosing unit communicates important system operating information (including dosing unit internal temperature) to the primary engine electronic control module (ECM) via the J1939 data link network. For an airless SCR system, the dosing unit reports its internal temperature to the diesel exhaust fluid controller via the dosing unit signal wire, and the diesel exhaust fluid controller communicates this information to the primary engine electronic control module (ECM ) via the J1939 data link network. Component LocationThe aftertreatment diesel exhaust fluid dosing unit location is OEM dependent. Refer to...

Circuit DescriptionThe injector solenoid valves are actuated by the electronic control module (ECM) to control fuel metering and timing. Each injector solenoid is connected to the ECM by a supply and a return wire. An electrical pulse is sent to the injector from the ECM on the supply wire and returns to the ECM on the return wire after actuating the solenoid. Each solenoid valve is normally open, and it is only closed by an electrical pulse from the ECM during fuel injection and metering. Component LocationThe ISM has an internal actuator harness that connects to the external engine harness....