Navistar MaxxForce DT Diagnostic Manual page 119

Step
4 Check for failed Air Management System (AMS)
actuator.
1. Using Electronic Service Tool (EST) with
ServiceMaxx™ software, go to Tests > Load
Test Specific Session and verify Load Test
Specific Session is unchecked.
2. Go to Sessions > Performance and select
the record snapshot icon from the toolbar.
3. Go to Tests > KOER Tests > Air
Management Test. When Air Management
Test is complete, stop recording. Use the
playback feature in ServiceMaxx™, and
graph the following signal values:
Signal Values:
• Engine Speed
• Intake Manifold Pressure (IMP)
• Turbocharger 2 Wastegate control (TC2WC)
Does snapshot match Graph 1 or Graph 2 page 120?
To prevent personal injury or death, do not exceed local speed limit laws or drive too fast
for conditions when performing Lug Down Test.
Step
5A Check for engine performance issues. Using EST, go
to Sessions > Performance. Find an open stretch of
road in order to perform Lug Down Test. When driving
conditions are safe, select the record snapshot icon from
the toolbar, and perform Lug Down procedure below:
1. Select a suitable high range gear (Example:
In a 10 speed gearbox, select the 8th
speed).
2. Allow engine speed to drop to 1000 RPM
3. Press accelerator pedal fully to the floor,
and accelerate to rated engine speed.
After Lug Down Test is complete, stop recording and
save snapshot.
Action
WARNING
Action
https://www.truck-manuals.net/
DIAGNOSTIC MANUAL
Decision
Graph 1: Go to step 5A
Graph 2: Diagnose and repair failed
actuator (See Performance Diagnostics
section in Engine Diagnostic Manual).
After repairs are complete, retest for
original problem.
Decision
Go to step 5B
115