328 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
BCP Pin-Point Diagnostics (ECM to Valve Cover
Gasket Connector)
Figure 392 BCP circuit diagram with VC Gasket Breakout Harness
Connector Voltage Checks (Disconnect engine harness from valve cover gasket connector and connect
VC Gasket Breakout Harness to engine harness only. Turn the ignition switch to ON.)
Test Point
Spec Comment
A to gnd 0 V to 0.25 V
If > 0.25 V, signal circuit is shor
ted to V
REF
or B+.
Btognd 5V±0.5V
If voltage is not to spec, V
REF
shorted to ground, shorted to B+, or open.
Ctognd
0 V to 0. 25 V
Signal ground (no voltage expected). If > 0.25 V, check ground circuit
for open or high resistance and check signal ground for short to V
REF
or
B+.
Connector Resistance Che
cks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from valve cove
r gasket connector. Connect VC Gasket Breakout Harness to engine harness only.
1
)
A to Pin A (9260) > 1 kΩ If < 1 kΩ, check for short to ground w ithin wiring harness.
B to Pin A (9260) > 500 Ω If < 500 Ω, check for short to ground within wiring harness.
C to Pin A (9260) < 5 kΩ If > 5 kΩ,checkforope
n circuit .
WARNING: T o avoid se
rious 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.
Connector Resista
nce C hecks to Chassis Ground (Turn the ignition switch to OFF. Disconnect chassis
connector 9260
1
.D
isconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery
cable for ground test point.)
A to gnd cable
>1kΩ If < 1 kΩ, check for short to ground.
B to gnd cable
> 500 Ω If< 50 0 Ω , check for short to ground.
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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