The EGR temperature sensor is located in the intake manifold between cylinders 3 and 4
EGR sensor ( gas temperature sensor ) is monted near the EGR valve, which is install into the EGR tube.
On the EGR valve assembly.
The EGR valve and the EGR sensor work together. The EGR gas temperature sensor is mounted near the EGR valve. The sensor detects the temperature of the exhaust as it moves through the valve. The information is sent to the ECM and in turn the EGR on/off time is regulated precisely and more efficiently. Any malfunction with the EGR gas temperature sensor will set off a code 35 ( Info taken from HAYNES MANUAL)
The EGR valve is connected above the water hose on the 2002 Mazda Millennia. The EGR valve is responsible for lowering the temperature of the fuel.
Remove the wiring harness from the EGR temperature sensor. Remove the two retaining screws from the sensor. Reverse the process to install the new sensor.
Exhaust gas recirculation. The egr meters a small amount of exhaust gas back into the engine. This gas lowers the combustion temperature which lower the a mount of oxides of nitrogen in the exhaust.
Yes.
My service manual says this occurs if the engine coolant temperature (ECT) is above 60C with the EGR temperature less than 70C for 50 seconds. There is a long flowchart too complicated to list but it basically says it's one of the following: 1. Open or short from the EGR temperature sensor to the ECM. 2. A bad EGR temperature sensor. 3. An open connection (BLK/RED) between the fuse/relay box and the EGR SV (solenoid vacuum valve which is next to the EGR valve. The fuse and relay box is located on the driver side in the engine compartment. It contains relays and large amperage fuses. 4. A bad EGR SV valve 5. A bad ECM I have never had to look into this error so I cannot comment further. Hope this helps.
My Toyota manual for a 1991 Corolla DX says that error code #71 is used only for California specifications. Here is the official diagnosis, according to the manual: the EGR gas temperature sensor signal (THG) is below the total temperature of the intake air temperature plus 55 deg Cent. (99 degrees F) after driving for 25 seconds in EGR operation range. The manual then lists five trouble areas: 1- Open in EGR temperature sensor circuit; 2- Open in VSV circuit for EGR, 3- EGR vacuum hose disconnected, valve stuck; 4- Clogged in EGR gas passage; 5 - ECU.
The AC circuit does run into the EGR solenoid but I do not quite understand what its purpose is. Im thinking it has to do with cooling fan operation and idle speed adjustment. The EGR system simply allows exhaust gas to enter the combustion chamber when the cylinder temperature gets high to cool combustion temperature down.
an egr valve opens to put inert gases in the combustion chamber to lower the temperature. this is done to reduce NOx emissions that are produced at high temperatures.