470 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Connector Resistance Checks to Chassis Ground with Valve Cover Removed (Turn the ignit ion switch
to OFF. Disconnect chassis connector 9260
1
. Disconnect negative battery cable. Disconnect harness from
sensor. Use disconnected n egative battery cable for ground test point.)
1 to gnd cable
>500Ω If < 500 Ω, check for short to ground.
2 to gnd cable
>500Ω If < 500 Ω, check for short to ground.
3 to gnd cable
>1kΩ If < 1 kΩ, check for short to ground.
Harness Resistance Checks With Valve Cover Removed (Connect breakout box [X1] to engine harness
only. Connect UVC Pressure Sensor Breakout Harness to UVC connector only.)
X1–6 to 1
<5Ω If > 5 Ω, check for open ground.
X1–14to2
<5Ω If > 5 Ω, check for open V
REF
.
X1–20to3
<5Ω If > 5 Ω, check for o pe n ICP signal.
1
Connector 9260 is a 2-wi r e connector usually lo c ated 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 g round
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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