Eop Pin-Point Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

EOP Pin-Point Diagnostics

Figure 447 EOP 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
1 to gnd 0 V to 0.25
V
2 to gnd 5 V ± 0.5 V
3 to gnd 0 V to 0.25
V
Connector Resistance Checks to ECM Chassis Ground (Turn the ignition switch to OFF. Connect
breakout harness to engine harness only. Disconnect chassis connector 9260
1 to Pin A (9260) < 5 Ω
2 to Pin A (9260) > 500 Ω
3 to Pin A (9260) > 1 kΩ
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
1
connector 9260 . Disconnect negative battery cable. Disconnect harness from sensor. Use disconnected
negative battery cable for ground test point.)
1 to gnd cable > 500 Ω
2 to gnd cable > 500 Ω
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
Signal ground (no voltage expected). If > 0.25 V, check ground circuit for
open or high resistance and check signal ground for short to V
If voltage is not to spec, V
or open.
If > 0.25 V, signal circuit is shorted to V
If > 5 Ω, check for open circuit.
If < 500 Ω, check for short to ground within wiring harness.
If < 1 kΩ, check for short to ground within wiring harness.
If < 500 Ω, check for short to ground.
If < 500 Ω, check for short to ground.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
circuit is shorted to ground, shorted to B+,
REF
or B+.
REF
1
.)
431
or B+.
REF