7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 317
2 to gnd cable
>1kΩ If < 1 kΩ, check for V
REF
short to ground.
3 to gnd cable
>1kΩ If < 1 kΩ, check for signal short to ground.
Harness Resistance Checks (Connect breakout box to chassis harness [X3 and X4 only].)
X4-24to1
<5Ω If > 5 Ω, check fo r open signal groun d.
X4–4 to 2
<5Ω If > 5 Ω,checkforopenV
REF
.
X3–24 to 3
<5Ω If > 5 Ω, check for open signal circuit.
1
Connector 9260 is a 2-wire connector us ually located in the battery box. Pin A is the chassis ground connection for the
ECM and IDM. See truck Chassis Electrical Circuit Diagram Manual for comp lete chassis s ide ECM and IDM g r ou nd
circuit information.
Operational Voltage Checks for BAP Sensor (Check with breakout box connected [X3 and X4 only] to
ECM and chassis harness.)
Test Point Voltage Pressure
Comment
X3–24 to X4–24 4.89 V
105 kPa (31 in Hg)
High atmospheric pressure.
X3–24 to X4–24 4.60 V
100 kPa (29.5 in Hg)
Normal atmospheric pressure at sea level.
X3–24 to X4–24 2.60 V
60 kPa (17.7 in Hg) Normal atmospheric pressure at 10,000 feet.
BAP Diagnostic Trouble Codes
DTC 151 = Signal voltage was > 4.95 V for more than 0.5 second
DTC 152 = Signal voltage was < 1.0 V for mo
re than 0.5 second
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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