232 6 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. Do Test 13 Air Management
and Test 14 VGT Test.
Possible Caus es
• Restricted exhaust pipe
• Collapsed exhaust pipe
• Damaged muffler
• Turbocharger malfunction
• Clogged catalytic converter
• Clogged Catalyzed Die se l Particu late Filte r
(CDPF) – dependent on application
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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