It seems the scan tool display is using a raw data stream value that has no units and no conversion scale. The range for EGR cruise and decel is from -45.0 - 45.0 KPa or -6.5 - 6.5 psi. EGR cruise can have either Comp ID 4C or 0C and EGR decel 4D or 0D. If com... Login to read more.