I reset/cleared P 0402 with the OBD-II software driven a couple of cycles still OK.
after that high speed segment I-80 210 miles around Chicago yesterday 31.8mpg P 0402 can come back :rolleyes: Maybe it's that oxygenated Mobil gas in the Rockford area????? The good mileage not the code.
Paul
it happens every time on the way back that fill-up is aways approx 2 mpg better than normal?
DPFE sensor
1. disconnect the pressure hoses at the sensor
2. connect a hand vaccum pump to the downstream pickup marked REF on the sensor.
3. Using a mulitimeter, backprobe the STG RTN circuit at the DPFE connector.
4. With igniton ON, signal voltage should be 0.20-0.70 volts
5. apply 8-9 in. Hg of vaccum, voltage should be greater than 4 volts
6. quickly release the vaccum voltage shold drop to less than 1 volt in 3 seconds.
However if the DPFE is bad you would think you would get codes P1400 or P1401 or if up or downstream problem P1405 or 1406.
Chilton's can you trust it?
7. Here's Chilton's for you-- if the sensor does not respond as specified, check the power and grnd circuit. HOW?
