Navistar International DT 466 Diagnostic/Troubleshooting Manual page 236

232
• 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 switch 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 switch to ON.
d. Clear all DTCs.
e. An inoperative
suspect. Do Test 13 Air Management
and Test 14 VGT Test.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
Possible Causes
•
•
•
•
•
•
turbocharger is
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Restricted exhaust pipe
Collapsed exhaust pipe
Damaged muffler
Turbocharger malfunction
Clogged catalytic converter
Clogged Catalyzed Diesel Particulate Filter
(CDPF) – dependent on application