Exhaust Restriction; Monitoring Ebp Using Est - Navistar International DT 466 Diagnostic/Troubleshooting Manual

8. Exhaust Restriction

Figure 301
Purpose
To check for restrictions in the exhaust system likely
to cause engine performance problems
NOTE: High intake or exhaust restriction can cause a
large amount of black smoke.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.

Monitoring EBP using EST

NOTE: If an EST is not available, use alternate
method – "Monitoring EBP using Pressure Sensor."
1. See "DT 466 Performance Specifications" –
Appendix A (page 595) or "DT 570 and HT 570
Performance Specifications" – Appendix B (page
619) for specifications and record on Diagnostic
Form.
2. Inspect the exhaust system for damage and
restriction.
3. Disconnect the EGR control valve. If EGR control
valve is plugged in during the test, results will be
incorrect.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
Figure 302 KOER Air Management.ssn
4. Open D_KOER_AirManagement.ssn to monitor
possible death or damage to the engine or vehicle
– comply with the following:
When running the engine in the service bay, make
sure the parking brake is set, the transmission is
in neutral, and the wheels are blocked.
5. Run engine at high idle, no load.
6. Record results on Diagnostic Form.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
NOTE: When the EGR
disconnected, the ECM will set DTC 163 (Position
signal out of range low ) and possibly DTC 365
(Position above/below desired level) for the EGR
control valve. Ignore and clear DTC 163 and DTC
365, after the test is complete.
EBP at high idle, no load.
WARNING: To avoid serious personal injury,
NOTE: Do not run KOER Air Management test.
The session is open to monitor EBP at high idle
and to clear DTC after it is set.
• If restriction is to specification, do the
following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition switch to ON.
d. Clear all DTCs.
e. Continue Performance Diagnostics.
231
control valve is