Cumminz

Circuit DescriptionThe engine control module (ECM) provides a 5 volt supply to the engine crankshaft speed/position sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The crankshaft speed/position sensor provides a signal to the ECM on the crankshaft speed/position sensor signal circuit. This sensor generates a signal to the ECM as the crankshaft speed indicator ring passes the sensor. The ECM interprets this signal into an engine speed reading and determines engine position based on the missing tooth on the speed indicator ring. Conditions for Running the DiagnosticsThis diagnostic runs continuously when...

Circuit DescriptionThe engine control module (ECM) provides a 5 volt supply to the engine camshaft speed/position sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The camshaft speed/position sensor provides a signal to the ECM on the camshaft speed/position sensor signal circuit. This sensor generates a signal to the ECM as the camshaft speed indicator lobe passes the sensor. The ECM interprets this signal into an engine speed reading and determines engine position. This sensor is used as a backup sensor if the primary engine crankshaft speed/position signal is lost. Conditions for...

Circuit DescriptionThe crankshaft position and camshaft position sensors are Hall effect type sensors. The electronic 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 to determine the position of the engine by the ECM. Conditions for Running the DiagnosticsThis...

Circuit DescriptionThe turbocharger speed sensor is a variable reluctance speed sensor. It consists of a coil of wire and an iron core. The target on the turbocharger shaft is a ground flat in the center of the shaft. As the flat on the turbocharger shaft passes the speed sensor, a signal is generated. The engine control module (ECM) interprets this signal and converts it to a turbocharger speed reading. Component LocationThe turbocharger speed sensor is located in the center housing of the turbocharger. Conditions for Running the DiagnosticsThis diagnostic runs continuously when the engine is running. Conditions for Setting the...

Circuit DescriptionThe exhaust gas temperature is calculated by the electronic control module (ECM). The 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 know as turbine intake temperature. Some original equipment manufacturers (OEM) have pyrometer gauges mounted in their chassis. Pyrometers measure turbine outlet exhaust gas temperature leaving the turbocharger...