Navistar International DT 466 Diagnostic/Troubleshooting Manual page 333

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
C to gnd cable > 500 Ω
Harness Resistance Checks (Connect breakout box [X1] to engine harness only. Connect VC Gasket
Breakout Harness to engine harness only.)
X1–20 to A < 5 Ω
X1–14 to B < 5 Ω
X2–11 to C < 5 Ω
1
Connector 9260 is a 2-wire connector usually in the battery box. Pin A is the chassis ground connection for the ECM
and IDM. See truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM ground circuit
information.
Figure 393 BCP circuit diagram with VC Gasket Breakout Harness
Operational Voltage Checks for BCP Sensor with VC Gasket Breakout Harness (These checks are
done if an EST is not available and the valve cover is not removed. Check with VC Gasket Breakout
Harness connected to valve cover gasket connector and engine harness.)
Test Point EST voltage readings:
Signal to ground
A to C 0.15 V to 0.3 V
A to C 0.15 V to 0.3 V
Operational Voltage Checks for BCP Sensor with breakout box (Check with breakout box connected
to ECM and engine harness.)
X2–11 to X1–6 0.15 V to 0.3 V
X2–11 to X1–6 0.15 V to 0.3 V
BCP Diagnostic Trouble Codes
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
If< 500 Ω , check for short to ground.
If > 5 Ω, check for open BCP signal.
If > 5 Ω, check for open V
If > 5 Ω, check for open ground.
Spec
0 psi (0 kPa)
0 psi (0 kPa)
0 psi (0 kPa)
0 psi (0 kPa)
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
.
REF
Checks
Atmospheric pressure with key-on
engine-off
Maximum at engine cranking speed
Atmospheric pressure with key-on
engine-off
Maximum at engine cranking speed
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