DIAGNOSTIC MANUAL
10.2. GRAPH 2: AIR MANAGEMENT SYSTEM TEST (BAD)
1. Engine speed (rpm) [Green]
2. Turbocharger 2 Wastegate Control
(TC2WC) (percent) [Purple]
3. Intake Manifold Pressure (IMP)
(psi) [Orange]
Figure 27
Graph 2: Air Management System Test (Bad)
Graph Analysis:
This graph shows an Air Management System (AMS) not operating as designed during the Air management
Test (AMT). The AMT does not give pass or fail results. It only allows the user to validate the AMS by
monitoring the effects each actuator has on Intake Manifold Pressure (IMP) sensor. IMP is normally between 8
psi (55 kPa) to 13 psi (90 kPa) on engine ramp up during AMT. If Turbocharger 2 Wastegate Control (TC2WC)
is not operating as designed, boost pressure will not respond to changes in engine load. Excess soot will then
be generated by the engine causing frequent regeneration of the aftertreatment system.
122
https://www.truck-manuals.net/
