Nissan 14956-38U01 Solenoid Valve Assembly

To decrease the amount of NOx released, a portion of exhaust gases are forced back into the intake manifold by Exhaust Gas Recirculation (EGR) system found in four-cylinder and 3.3L V6 models. This mixture lessens combustion temperatures reducing NOx formation. The EGR system comprises parts like the EGR control solenoid valve, EGR valve, EGR temperature sensor, and EGR control backpressure transducer valve. By use of vacuum signals, PCM operates the EGR control solenoid. In the vacuum system there is a tap in the air intake system while in ported vacuum control system there is a throttle body exposed to manifold vacuum during acceleration. It assists in controlling EGR vacuum signal by monitoring exhaust backpressure; also the PCM takes its orders from EGT sensor on changes happening inside of this passage. Properly function your systems by checking hoses, connections and inspecting for damage, cracks or leaks. Bring engine to operating temperature before testing EGR system allowing it to idle and opening/closing throttle to observe movement of egr valve steam which indicates proper workability of the system if it moves but check vacum signal and connections if it does not move. These can include clogged passages or faulty valves that may need service such as cleaning or replacing diaphragm movements and so on. Additionally, examine voltage signals and operations for an egr control solenoid when you replace it should any be found wanting while blown at coolers should be unclogged then flushed with water. Also when subjected to vacuum this may cause hissing sound but should cease when pressure goes beyond 0.145 psi in case of an egr control backpressure transducer valve leaking . Finally immerse its tip into hot water during resistance checks for an egr temperature sensor so that any marked decrease suggests malfunction. Service or replace them by taking out deposits from mounting surfaces once you have cleaned EGR valve before rechecking for proper installation. For a control solenoid of an EGR system, you can begin by unplugging its electrical connectors then detaching vacuum hose before removing the solenoid and reinstalling it again. An EGR temperature sensor is dismantled by disconnecting electrical connector first then unscrewing the sensor plug.

EGR system recirculates a portion of its exhaust gases into the intake manifold, which causes low combustion temperature and subsequently NOx compound reduction.The PCM controls various other components such as the EGR valve, EGR control solenoid valve, EGR temperature sensor and EGR control backpressure transducer valve in this system.The PCM utilizes information from both ported and manifold vacuum systems and EGR temperature sensor to assist in determining the timing for turning on or off the EGR. Examine hoses, connections and vacuum lines for damage or adequate attachment when checking the EGR system.Ensure that the engine reaches operating temperature and let idle; open and close throttle to see whether there is movement of stem of EGR valve which indicates good operation of control system. If there is no movement, inspect whether vacuum signal is reaching to the EGR valve otherwise check hoses and the EGR control solenoid. For further component tests, apply vacuum to see if it opens and stays open while you can clean it in case there are deposits inside an EGR valve. Also, check vacuum signal for an electronic solenoid that controls a specific motor with applied voltage by using battery terminals. When tested with vacuum test system should leak through the EPV. Lastly, contact resistance can be measured by submerging the component into water thereby observing resistance changes along with temperature.Parts replacement entails instructions of how to remove, clean or replace parts such as: The 1999 models onwards have their Exhaust Gas Recirculation Systems consisting of PCM controlled stepper motor type valves that regulate precise flow rates based on engine conditions for better performance.These components have same checks as well as replacement procedures included in this manual.

To decrease the amount of NOx released, a portion of exhaust gases are forced back into the intake manifold by Exhaust Gas Recirculation (EGR) system found in four-cylinder and 3.3L V6 models. This mixture lessens combustion temperatures reducing NOx formation. The EGR system comprises parts like the EGR control solenoid valve, EGR valve, EGR temperature sensor, and EGR control backpressure transducer valve. By use of vacuum signals, PCM operates the EGR control solenoid. In the vacuum system there is a tap in the air intake system while in ported vacuum control system there is a throttle body exposed to manifold vacuum during acceleration. It assists in controlling EGR vacuum signal by monitoring exhaust backpressure; also the PCM takes its orders from EGT sensor on changes happening inside of this passage. Properly function your systems by checking hoses, connections and inspecting for damage, cracks or leaks. Bring engine to operating temperature before testing EGR system allowing it to idle and opening/closing throttle to observe movement of egr valve steam which indicates proper workability of the system if it moves but check vacum signal and connections if it does not move. These can include clogged passages or faulty valves that may need service such as cleaning or replacing diaphragm movements and so on. Additionally, examine voltage signals and operations for an egr control solenoid when you replace it should any be found wanting while blown at coolers should be unclogged then flushed with water. Also when subjected to vacuum this may cause hissing sound but should cease when pressure goes beyond 0.145 psi in case of an egr control backpressure transducer valve leaking . Finally immerse its tip into hot water during resistance checks for an egr temperature sensor so that any marked decrease suggests malfunction. Service or replace them by taking out deposits from mounting surfaces once you have cleaned EGR valve before rechecking for proper installation. For a control solenoid of an EGR system, you can begin by unplugging its electrical connectors then detaching vacuum hose before removing the solenoid and reinstalling it again. An EGR temperature sensor is dismantled by disconnecting electrical connector first then unscrewing the sensor plug.

To decrease the amount of NOx released, a portion of exhaust gases are forced back into the intake manifold by Exhaust Gas Recirculation (EGR) system found in four-cylinder and 3.3L V6 models. This mixture lessens combustion temperatures reducing NOx formation. The EGR system comprises parts like the EGR control solenoid valve, EGR valve, EGR temperature sensor, and EGR control backpressure transducer valve. By use of vacuum signals, PCM operates the EGR control solenoid. In the vacuum system there is a tap in the air intake system while in ported vacuum control system there is a throttle body exposed to manifold vacuum during acceleration. It assists in controlling EGR vacuum signal by monitoring exhaust backpressure; also the PCM takes its orders from EGT sensor on changes happening inside of this passage. Properly function your systems by checking hoses, connections and inspecting for damage, cracks or leaks. Bring engine to operating temperature before testing EGR system allowing it to idle and opening/closing throttle to observe movement of egr valve steam which indicates proper workability of the system if it moves but check vacum signal and connections if it does not move. These can include clogged passages or faulty valves that may need service such as cleaning or replacing diaphragm movements and so on. Additionally, examine voltage signals and operations for an egr control solenoid when you replace it should any be found wanting while blown at coolers should be unclogged then flushed with water. Also when subjected to vacuum this may cause hissing sound but should cease when pressure goes beyond 0.145 psi in case of an egr control backpressure transducer valve leaking . Finally immerse its tip into hot water during resistance checks for an egr temperature sensor so that any marked decrease suggests malfunction. Service or replace them by taking out deposits from mounting surfaces once you have cleaned EGR valve before rechecking for proper installation. For a control solenoid of an EGR system, you can begin by unplugging its electrical connectors then detaching vacuum hose before removing the solenoid and reinstalling it again. An EGR temperature sensor is dismantled by disconnecting electrical connector first then unscrewing the sensor plug.

To decrease the amount of NOx released, a portion of exhaust gases are forced back into the intake manifold by Exhaust Gas Recirculation (EGR) system found in four-cylinder and 3.3L V6 models. This mixture lessens combustion temperatures reducing NOx formation. The EGR system comprises parts like the EGR control solenoid valve, EGR valve, EGR temperature sensor, and EGR control backpressure transducer valve. By use of vacuum signals, PCM operates the EGR control solenoid. In the vacuum system there is a tap in the air intake system while in ported vacuum control system there is a throttle body exposed to manifold vacuum during acceleration. It assists in controlling EGR vacuum signal by monitoring exhaust backpressure; also the PCM takes its orders from EGT sensor on changes happening inside of this passage. Properly function your systems by checking hoses, connections and inspecting for damage, cracks or leaks. Bring engine to operating temperature before testing EGR system allowing it to idle and opening/closing throttle to observe movement of egr valve steam which indicates proper workability of the system if it moves but check vacum signal and connections if it does not move. These can include clogged passages or faulty valves that may need service such as cleaning or replacing diaphragm movements and so on. Additionally, examine voltage signals and operations for an egr control solenoid when you replace it should any be found wanting while blown at coolers should be unclogged then flushed with water. Also when subjected to vacuum this may cause hissing sound but should cease when pressure goes beyond 0.145 psi in case of an egr control backpressure transducer valve leaking . Finally immerse its tip into hot water during resistance checks for an egr temperature sensor so that any marked decrease suggests malfunction. Service or replace them by taking out deposits from mounting surfaces once you have cleaned EGR valve before rechecking for proper installation. For a control solenoid of an EGR system, you can begin by unplugging its electrical connectors then detaching vacuum hose before removing the solenoid and reinstalling it again. An EGR temperature sensor is dismantled by disconnecting electrical connector first then unscrewing the sensor plug.

To decrease the amount of NOx released, a portion of exhaust gases are forced back into the intake manifold by Exhaust Gas Recirculation (EGR) system found in four-cylinder and 3.3L V6 models. This mixture lessens combustion temperatures reducing NOx formation. The EGR system comprises parts like the EGR control solenoid valve, EGR valve, EGR temperature sensor, and EGR control backpressure transducer valve. By use of vacuum signals, PCM operates the EGR control solenoid. In the vacuum system there is a tap in the air intake system while in ported vacuum control system there is a throttle body exposed to manifold vacuum during acceleration. It assists in controlling EGR vacuum signal by monitoring exhaust backpressure; also the PCM takes its orders from EGT sensor on changes happening inside of this passage. Properly function your systems by checking hoses, connections and inspecting for damage, cracks or leaks. Bring engine to operating temperature before testing EGR system allowing it to idle and opening/closing throttle to observe movement of egr valve steam which indicates proper workability of the system if it moves but check vacum signal and connections if it does not move. These can include clogged passages or faulty valves that may need service such as cleaning or replacing diaphragm movements and so on. Additionally, examine voltage signals and operations for an egr control solenoid when you replace it should any be found wanting while blown at coolers should be unclogged then flushed with water. Also when subjected to vacuum this may cause hissing sound but should cease when pressure goes beyond 0.145 psi in case of an egr control backpressure transducer valve leaking . Finally immerse its tip into hot water during resistance checks for an egr temperature sensor so that any marked decrease suggests malfunction. Service or replace them by taking out deposits from mounting surfaces once you have cleaned EGR valve before rechecking for proper installation. For a control solenoid of an EGR system, you can begin by unplugging its electrical connectors then detaching vacuum hose before removing the solenoid and reinstalling it again. An EGR temperature sensor is dismantled by disconnecting electrical connector first then unscrewing the sensor plug.

The most common cause of problems in the emissions system is a stuck or defective EGR valve.

The EGR valve is bolted to the rear cylinder head, at the transaxle end.