Navistar International DT 466 Diagnostic/Troubleshooting Manual page 328

324 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 390 BCP circuit diagram with 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 Valve Cover Gasket Connector (Use EST, DMM, 500 Ohm
Resistor Harness, and VC Gasket Breakout Harness to engine harness only.)
Test Condition
Harness disconnected from valve
cover gasket connector using
EST
Voltage from Pin B (Blue) of VC
Gasket Breakout Harness to
ground using DMM
500 Ohm Resistor Harness
connected between Pin A
(Green) and Pin B (Blue) of VC
Gasket Breakout Harness using
EST.
Resistance from Pin C (Black) of
VC Gasket Breakout Harness to
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 A 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 A to ground cable to check for
short to ground.
— Use a breakout box to measure from Pin A to Pin
X2-11 (spec < 5 Ω) to check for open in the harness.
< 5 Ω If resistance is > 5 Ω, check for open or high resistance
between ECM and UVC. Use a breakout box to measure
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