7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 297
DTC 346 – Faults detected during EGR portion of the AMS test
DTC 346 is set by the ECM during AMS test when the ECM measures EBP and does not see the expected
response in pressures.
Possible Cause Comment
EGR valve stuck or sticking Do “Performance Diagnostics” (page 205).
EBP sensor bias
Check sensor signal voltage. See “EBP Sens or” (p ag e 3 59).
EBP sensor or tube plugged
Clean and retest (replace if needed)
EGR c ontrol circuit Do EGR Pin-Point Diagnostics. See “EGR Actuator” (page 41
3
).
DTC 353 – VGT control over duty cycle
DTC 353 is set when the ECM overcompensates by increasing duty cycle to the VGT to achieve desired
boost/back p ressure.
Possible Cause Comment
High intake restriction
Do “Performance Diagnostics” (page 205).
Intake / CAC system leak (pipes, loose
clamps, hoses)
Do “Performance Diagnostics” (page 205).
Exhaust system leak
Do “Performance Diagnostics” (page 205)
BAP sensor bias low
Check sensor signal voltage. See “BAP Sens or” (p ag e 3 14).
MAP sensor bias low
Check sensor signal voltage. See “MAP Sensor” (page 500).
EBP sensor bias low
Check sensor signa l volt age . See “EBP S
ensor” (page 3 59).
ICP sensor bias high Check sensor signal voltage. See “ICP Sensor” (page 457).
Powercylinderintegrity
Do “Performance Diagnostics” (page 205).
ICP system integrity Do “Performance Diagnostics”
Injector operation / part number Check previous repairs. Do “Performance Diagnostics” (page
205).
EGR valve stuck open Do “Performance Diagnostics” (page 205).
VGT actuator or vanes sticki
ng
Do “Performance Diagnostic
s” (page 205).
VGT control circuit open or short to
ground
Do VGT Pin-Point Diagnostics. See “VGT Actuator” (page 524).
VGT power and ground circuits. Do VGT Pin-Point Diagnostics. See “VGT Actuator” (page 524).
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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