326 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 391 BCP circuit diagram with UVC Pressure Sensor Breakout Harness
WARNING: To avoid serious personal injury, possible death, or damage to the engine or vehicle,
always disconnect main negative battery cable first. Always connect the main negative battery cable
last.
Circuit Checks for BCP Sensor – ECM to BCP Sensor (If Circuit Checks for BCP Sensor – ECM to Valve
Cover Gasket Connector are complete and test results are to specification for all test conditions, but an active
code remains, remove valve cover following procedure in the Engine Service Manual. Use EST, DMM, 500
Ohm Resistor Harness, and UVC Pressure Sensor Breakout Harness connected to U VC connector only.)
Test Condition Spec Checks
BCP sensor connector removed
from UVC connector using EST
0V
If voltage > 0.039 V, check BCP signal for short to V
REF
or B+.
Voltage from Pin 2 (Blue) of
UVC Pressure Sensor Breakout
Harness to ground using DMM.
5V±0.5V
If voltage > 5 .5 V, che ck V
REF
for short to B +. If voltage is
< 4.5 V, check V
REF
for open or short to ground.
500 Ohm Resistor Harness
connected between Pin 3
(Green) and Pin 2 (Blue) of VC
Gasket Breakout Harness using
EST
5V
If voltage < 4.9 V, check BCP signal for open or short
to ground.
— Disconnect connector 9260
1
. Measure resistance
from Pin 3 to Pin A of connector 9260 (spec > 1 kΩ)
to check for short to ground within wiring harness.
— D isconnect negative battery cable. Measure
resistancefromPin3togroundcabletocheckfor
short to ground.
— UseabreakoutboxtomeasurefromPin3toPin
X2-11 (spec < 5 Ω) to check for open in the harness.
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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