Navistar INTERNATIONAL DT 466 - EOT Pin-Point Diagnostics

438 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
EOT Pin-Point Diagnostics
Figure 451 EOT circuit diagram
Connector Voltage Checks to Ground (Disconnect harness from sensor. Inspect for bent pins or corrosion.
Connect breakout harness to engine harness only. Turn the ignition switch to ON.)
Test Point
Spec Comment
2 to gnd 4.8 V to 5.0 V
Pull up voltage, if low or no v oltage, circuit has open, high resistance,
or short to ground.
1 to gnd 0 V to 0.25 V
If > 0.2 5 V, signal ground wire is shorted to V
REF
or B+.
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Disconnect
harness from sensor. Connect breakout harness to engine harness only. D isconnect chassis connector
9260
1
.)
1toPinA(9260) <5Ω If > 5 Ω, check for open circuit.
2toPinA(9260) >1kΩ If < 1 kΩ, check for short to ground within wiring harness.
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
connector 9260
1
. Disconnect negative battery cable. Disconnect harness from sensor. Connect breakout
harness to engine harness only. Use disconnected negative battery cable for ground test point.)
1togndcable
>500Ω If < 500 Ω , check for short to ground.
2togndcable
>1kΩ If < 1 kΩ, check for signal short to ground.
Harness Resistance Checks (Connect breakout box to engine harness only.)
X1–6 to 1
<5Ω If > 5 Ω, check for open ground wire
X2–1 to 2
<5Ω If > 5 Ω, check for open signal wire
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.