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Reason:Engine Crankshaft Speed/Position – Data Erratic, Intermittent, or Incorrect. Crankshaft engine speed sensor intermittent synchronization. Effect:Possible reduced engine performance. Circuit Description:The 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...

Reason:Engine Camshaft Speed/Position Sensor – Data Erratic, Intermittent, or Incorrect. Camshaft engine speed sensor intermittent synchronization. Effect:None on performance. Circuit Description:The 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 moves past the sensor. The ECM interprets this signal into an engine speed reading and determines engine...

Reason:Engine Crankshaft Speed/Position – Data Valid But Above Normal Operational Range – Most Severe Level. Engine speed signal indicates engine speed above engine protection limit. Effect:Possible reduced engine performance. Circuit Description:The 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...

Reason:Turbocharger Turbine Intake Temperature – Data Valid But Above Normal Operating Range – Least Severe Level. Turbocharger turbine intake temperature has exceeded the engine protection limit. Effect:Possible reduced engine performance. Circuit Description:The exhaust gas temperature is calculated by the engine 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 Location:There 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,...

Reason:Turbocharger Turbine Intake Temperature – Data Valid But Above Normal Operating Range – Least Severe Level. Turbocharger turbine intake temperature has exceeded the engine protection limit. Effect:Possible reduced engine performance. Circuit Description:The exhaust gas temperature is calculated by the engine 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 Location:There 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,...