Eci Circuit Diagnostics - Navistar International DT 466 Diagnostic/Troubleshooting Manual

368 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS

ECI Circuit Diagnostics

Figure 417 ECI circuit diagram
The ECI circuit requires the use of vehicle circuit
diagrams. See truck Chassis Electrical Circuit
Diagram Manual for circuit numbers, connector and
fuse locations.
ECI Relay Voltage Checks (Turn the ignition switch to ON. Check with ECI relay removed.)
Test Point Spec
86 to gnd 12 V ±1.5 V
30 to gnd 12 V ± 1.5 V
85 to gnd 4 V to 5 V
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
Check with relay disconnected and starter switch (key or button)
engaged. If no voltage present, troubleshoot ignition crank circuit.
If no voltage is present, troubleshoot battery wiring.
ECM will pull circuit up to 4 V to 5 V with switch ON and go to 0 V when
the clutch is depressed or transmission is in neutral.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.