code 336 337

[hbado]

hi guys! got this codes that seems to be referred to the EGR valve.I think of replacing the EGR valve but manual says high voltage detected in EGR Sensor...so I thought could be the transducer.any help welcome...by the way got too the 543 and 556 codes referred to fail in the fuel pump circuitry ..but everything seems to be OK.Thanks!

 

[MrShorty]

1st question: are the 336/337 KOEO codes (before separator pulse during KOEO test) or CM codes (after separator pulse). If they are KOEO codes, then check wiring between computer and PFE/DPFE sensor. If the wiring checks out, then replace sensor, as these sensors seem to be common failures.

 

[hbado]

HI ...test is KOEO code 337, after the code reader gives a 10 and CM gave 336,337,543 and 556 Just arrived from a drive and check engine now is off......!After three days of being continously on. ·Wires checked..seems no problem.The truck is 120K and no sensors ever changed.Thanks again.I wan´t to insist about how helpful the forum is.My truck is a white fly around and mechanics are no familiar with auto transmissions and american cars.so...I am on my own!