Navistar INTERNATIONAL DT 466 User Manual

484 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
CAUTION: To avoid engine damage, turn the ignition switch to OFF before disconnecti
ng the connector or
relay for th e IDM. Failure to turn th e ignition switch to OFF will cause a voltage spi
ke and dam age to electrical
components.
Voltage Checks at IDM – Key-On Engine-Off (Check with IDM power relay installed. Disconnect IDM X3
connector. Ground Pin X3–27 using Terminal Test Pin Adapter and harness to activate relay and check at
harness connector. Inspect for bent pins or corrosion.)
Test Point
Spec Co m ment
IDM X3–7 to gnd 12 V ± 1.5 V
PowerfromignitionswitchtoIDM.Ifnovoltage,seetruckChassi
s
Electrical Circuit Diagram Manual.
IDM X3–1 to gnd 0 V to 0.25 V
Ground – voltage reading indicates poor ground to battery. See truck
Chassis Electrical Circuit Diagram Manual.
IDM X3–2 to gnd 0 V to 0.25 V
Ground – voltage reading indicates poor ground to battery. See truck
Chassis Electrical Circuit Diagram Manual.
IDM X3–3 to gnd 0 V to 0.25 V
Ground – voltage reading indicates poor groun
dtobattery. Seetruck
Chassis Electrical Circuit Diagram Manual.
IDMX3–22tognd 0Vto0.25V
Ground – voltage reading indicates poor ground to battery. See truck
Chassis Electrical Circuit Diagram Manual.
IDMX3–26tognd 0Vto0.25V
Ground – voltage reading indicates poor ground to battery. See truck
Chassis Electrical Circuit Diagram Manual.
IDM X3–27 to gnd 0 V to 0.25 V IDM grounds relay through internal transistor. Expect 0 V with X3–27
grounded. If voltage is present, c heck Terminal Test Pin Adapter and
jumper.
IDM X3–8 to gnd 12 V ± 1.5 V
Power from relay to IDM. If no voltage, check fuses. If a fuse is blown,
check for short to ground. If fuses are good, check for open circuit
between 87 and X3–8. See truck Chas sis Electrical Circuit Diagram
Manual for circuit numbers, connector and fuse locations.
IDM X3–4 to gnd 12 V ± 1.5 V
Power from relay to IDM. If no v
oltage, check for open between Pin
X3–4and87onIDMrelay. Seet
ruck Chassis Electrical Circuit Diagram
Manual for circuit numbers
, connector and fuse locations.
IDM X3–23 to gnd 12 V ± 1.5 V
Power from relay to IDM. If no voltage, check for open between Pin
X3–23 and 87 on IDM relay. See truck Chassis Electrical Circuit
Diagram Manual for circuit numbers, connector and fuse locations.
IDM X3– 24 to gnd 12 V ± 1.5 V
Power from relay to IDM. If no voltage, check for open between Pin
X3–24 and 87 on IDM relay. See truck Chassis Electrical Circuit
Diagram Manual for circuit numbers, connector and fuse locations.
IDM X3–25 to gnd 12 V ± 1.5 V
Power from relay to
IDM. If no voltage, check for open between Pin
X3–25 and 87 on IDM
relay. See truck Chassis Electrical Circuit
Diagram Manual fo
r circuit numbers, connector and fuse locations.
WARNING: T o avoid
serious personal injury, possible death, or damage to the engine or vehicle,
always disconnec
t main negative battery cable first. Always connect the main negative battery cable
last.
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.

Navistar INTERNATIONAL DT 466 Specifications

General

Brand	Navistar
Model	INTERNATIONAL DT 466
Category	Engine
Language	English