Quote:
Originally Posted by Mr_Bentwrench
Disconnect D.P.F. EGR sensor.
Key on, engine off.
Measure voltage between the sensor VREF circuit and SIG RTN circuit at the D.P.F. EGR sensor vehicle harness connector.
Is VREF voltage between 4.0 and 6.0 volts?
if the connector has these values when unplugged from dpfe sensor the dpfe sensor is bad.
which would be the same as unplugging sensor and seeing if code P0402 excess flow it tripped.
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I am having problems with the same trouble codes and have centered it to the DPFE. I have a 2001 F150. I have tried the test with a volt meter by back probing the electrical connection which is still connected to the DPFE and still has vacuum lines attached to it. Is this the correct procedure? The reason I ask is when the motor was cold and I had probes attached to the ground and the singal wire on the sensor connection I had 4.9 volts. When the motor was warm the volts never changed. Am I probing the correct wires? There are 3, signal ground and ref. Which wires should I prob?
Thank you for your help?