![]() The MAP measures the air pressure changes entering the engine. The downstream monitors the performance of the SCR to reduce emissions. The upstream part checks the oxygen level in exhaust gasses and sends it to the ECU to optimize the air-to-fuel ratio. The first one is before, and the second one is after the SCR system. There are also two 6-wire oxygen sensors on the exhaust system of the Cummins 6.7-liter engine. However, its failure can result in increased fuel consumption. They have the purpose of controlling nitrogen oxide emissions to fulfill EPA regulations. While the second one is on the tailpipe after the selective catalytic reduction (SCR) system. The first one is the upstream sensor right after the turbo downpipe. There are 2 NOx sensors on Cummins 6.7-liter engine. It also has a role in the regenerative emission process of the engine to measure its pressure and tell ECU to control the regenerative gasses rate into the intake system. It measures the filter’s pressure, and any abnormal pressure value indicates a choked filter. The location of the crankcase pressure sensor is on top of the valve cover, right behind the crankcase vent filter. ![]() A faulty IAT can result in increased fuel consumption and symptoms like a hard start or loss of power. This information is vital for the engine to ensure its correct ignition timing. Therefore, it measures the ambient temperature of the air. Its probe is inside the second air intake runner, which is the cold air intake side. You can find it on the top left side of the intake manifold. IAT is a 2-wire sensor to measure the temperature of the air intake. You will often need to clean it from dirt or oil on its electrodes for accurate performance. Its purpose is to measure the airflow entering the engine and send the information to the ECU.īased on this data, ECU will control the fuel required and engine timing. You can locate the MAF sensor on your Cummins 6.7-liter engine at the air filter box close to the intake manifold.
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