1999 Frieghtliner Rollback with 5.9 24v Cummins

[SteveS]

From the Cummins book at the beginning of the article for 433:

Fault Code: 433

Reason: Boost pressure signal indicates boost pressure is high when other engine parameters indicate boost pressure should be low or boost pressure is low when engine parameters indicate it should be high.

Effect: Engine will derate to no-boost fueling

 

The pages are on the way.

[LARRY BRUDZYNSKI]

Check the oil pressure sensor/switch. I'll bet the update has not been done. Cummins had a problem with the fact that they installed a duel sensor/switch but had problems with it because it would read to low of a pressure and send it to a derate. Their fix change it over to a switch only with a calibration update to the ECM. Should have one wire if it's been done.

[ablokzyl]

Well after waiting several weeks for parts......they finally arrived. I installed a new map sensor and wastegate actuator. I took it down the road and it runs like a raped ape. Thanks guys for all the help. This would have been horrible to diag without the help.