7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 327
Resistance from Pin 1 (Black) of
UVC Pressure Sensor Breakout
Harness to ECM chassis ground
(Pin A of connector 9260) using
DMM.
<5Ω If resistance is > 5 Ω, check for open or h igh resistance
between ECM and UVC connector. Use a breakout box
tomeasureresistancefromX1-6toPin1(spec<5Ω).
Connect BCP sensor to UVC connection. Use the EST to clear DTCs. If test results are to spec for all test
conditions, but an active code remains, replace sensor.
NOTE: If all t ests are to specification, but DTCs return when the valve cover is torqued down, replace the
valve cover gasket.
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 Diagr
am Manual for complete chassis side ECM and IDM ground
circuit information.
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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