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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
A to gnd
0 V to 0.25 V
B to gnd
5 V ± 0.5 V
C to gnd
0 V to 0. 25 V
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from valve cover gasket connector. Connect VC Gasket Breakout Harness to engine harness only.
A to Pin A (9260)
> 1 kΩ
B to Pin A (9260)
> 500 Ω
C to Pin A (9260)
< 5 kΩ
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.
Connector Resistance Checks to Chassis Ground (Turn the ignition switch to OFF. Disconnect chassis
1
. Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
connector 9260
negative battery cable for ground test point.)
A to gnd cable
> 1 kΩ
B to gnd cable
> 500 Ω
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
If > 0.25 V, signal circuit is shorted to V
If voltage is not to spec, 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
B+.
If < 1 kΩ, check for short to ground within wiring harness.
If < 500 Ω, check for short to ground within wiring harness.
If > 5 kΩ, check for open circuit .
If < 1 kΩ, check for short to ground.
If< 500 Ω , check for short to ground.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
or B+.
REF
shorted to ground, shorted to B+, or open.
REF
or
REF
1
)
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