Causes. EGR stuck open, EGR VSV, EGR VSV open circuit, EGR temerature sensor short circuit, or ECM, Or ECM power and ground circut propblems...
To check the temp sensor cicuit, you need a scan toll that can read the EGR gas temps, if the temp reads 318.7 Degrees F there is a short in the temp sensor cicuit.
This is on a warm engine of course... disconnect EGR temp sensor connector, If reading is 37.6 Degrees F replace the sensor... If it is not you need to test the wires between the sensor and the PCM, if they test OK replace the PCM!
Thursday, April 3rd, 2008 AT 2:12 PM