Navistar MaxxForce DT Diagnostic Manual page 56

DIAGNOSTIC MANUAL
Actions:
1. When EGR valve is commanded ON, verify Intake Manifold Pressure (IMP) signal value drops.
2. When EGR valve is commanded ON, verify Mass Air Flow (MAF) Mean Value (MMV) drops.
Calculate the difference between MMV at a stabilized high point and a stabilized low point, then
compare to the table below.
Engine
MaxxForce® DT
215 - 230 HP
MaxxForce® DT
245 - 300 HP
MaxxForce® 9 and 10
300 - 350 HP
NOTE – EGR valve position will never read less than 35% and is considered closed.
52
MAF Mean Value (MMV)
Difference
690 – 1000
740 – 1000
850 – 1130
https://www.truck-manuals.net/
Tolerance
Less than 690 Fails AMS Test
Less than 740 Fails AMS Test
Less than 850 Fails AMS Test