Navistar International DT 466 Diagnostic/Troubleshooting Manual page 330

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 UVC connector only.)
Test Condition
BCP sensor connector removed
from UVC connector using EST
Voltage from Pin 2 (Blue) of
UVC Pressure Sensor Breakout
Harness to ground using DMM.
500 Ohm Resistor Harness
connected between Pin 3
(Green) and Pin 2 (Blue) of VC
Gasket Breakout Harness using
EST
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Spec Checks
0 V If voltage > 0.039 V, check BCP signal for short to V
or B+.
5 V ±0.5 V
If voltage > 5.5 V, check V
< 4.5 V, check V
5 V If voltage < 4.9 V, check BCP signal for open or short
to ground.
— Disconnect connector 9260
from Pin 3 to Pin A of connector 9260 (spec > 1 kΩ)
to check for short to ground within wiring harness.
— Disconnect negative battery cable. Measure
resistance from Pin 3 to ground cable to check for
short to ground.
— Use a breakout box to measure from Pin 3 to Pin
X2-11 (spec < 5 Ω) to check for open in the harness.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
for short to B+. If voltage is
REF
for open or short to ground.
REF
1
. Measure resistance
REF