6 PERFORMANCE DIAGNOSTICS 233
Monitoring EBP using Pressure Sensor Breakout
Harness
NOTE: Do this procedure, if an EST is not available.
This is an alternate method.
Tools
• Pressure sensor breakout harness
• Digital Multimeter (DMM)
Figure 303 Pressure Sensor Breakout Harness
to EBP 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. Connect Pressure Sensor Breakout Harness to
engine harness and EBP sensor.
3. Use DMM to measure EBP at high idle, no load.
• Connect POS to green (signal circuit) and
NEG to black (signal ground).
WARNING: To avoid serious
personal injury,
possible death or damage
to the engine or vehicle
– comply with the followi
ng:
When running the engine i
n the service bay, mak e
sure the parking brake
is set, the transmission is
in neutral, and the wh
eels are blocked.
4. Run e ngine at high idle, no load.
5. Record results on Diagnostic F orm.
• If restriction is to specification, do the
following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition sw itch to ON.
d. Clear all DTCs.
e. Continue Performance Diagnostics.
• If restriction is above specification, remove
exhaust pipe from turbocharger outlet and
retest.
• If restriction is to specification with exhaust
pipe removed, do the following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition sw itch to ON.
d. Clear all DTCs.
e. Correct problem from turbocharger
outlet to tail pipe.
• If exhaust back pressure is still high with pipe
removed from turbocharger outlet, do the
following:
a. Turn ignition switch to OFF.
b. Reconnect EGR control valve.
c. Turn ignition sw itch to ON.
d. Clear all DTCs.
e. An inoperative turbocharger is
suspect. An EST is needed to run
Test 13 Air Management and Test 14
VGT Test.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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