Table of Contents
Advertisement
360
7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
EBP Circuit Operation
Figure 413 EBP circuit diagram
The EBP sensor is supplied with a 5 V reference
voltage at Pin 2 from ECM Pin X1–14. The EBP
sensor is grounded at Pin 1 from ECM Pin X1–6. The
EBP sensor returns a variable voltage signal from Pin
3 to ECM Pin X2–8.
Fault Detection / Management
When the EBP signal voltage is detected out of range
high or low, the ECM will cause the engine to ignore
the EBP signal. The EGR valve will close and the
ECM will rely on the VGT pre-programmed values.
EBP Diagnostic Trouble Codes (DTCs)
DTCs are read using the EST or by counting the
flashes from the amber and red ENGINE lamp.
DTC 341
EBP signal out-of-range low
•
DTC 341 is set by the ECM when the EBP signal
is less than 0.039 V for more than 0.5 second.
•
DTC 341 can be set due to an open or short to
ground on the signal circuit, a failed EBP sensor
or an open V
circuit or V
REF
•
When DTC 341 is active the amber ENGINE lamp
is illuminated.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
short to ground.
REF
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
DTC 342
EBP signal out-of-range high
•
DTC 342 is set by the ECM when the EBP signal
is more than 4.9 V for more than 0.5 second.
•
DTC 342 can be set due to a signal circuit shorted
to V
or B+, or a failed EBP sensor.
REF
•
When DTC 342 is active the amber ENGINE lamp
is illuminated.
DTC 344
Above specification, engine off
•
DTC 344 is set by the ECM when the exhaust
back pressure is greater than expected with the
key-on engine-off.
•
DTC 344 can be set due to a plugged EBP sensor,
a restriction in the tube leading to the sensor, an
open signal ground, or a failed EBP sensor. To
check for possible restriction, remove the sensor
and tube and inspect for carbon deposits.
•
When DTC 344 is active the amber ENGINE lamp
is illuminated.
Advertisement
Chapters
Table of Contents
