Navistar INTERNATIONAL DT 466 User Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 339
NOTE: Complete all pin-point diagnostics (ECM to valve cover gasket connector) bef
ore removing
valve cover for under-valve-cover diagnostics.
• Turn the ignition switch to OFF before disconnecting engine wiring harne
ss connectors from components.
•SeetruckChassis Electrical Circuit Diagram M anual fo r circuit num bers
, connector and fuse locations.
Actuator Control Voltage Check at Valve Cover Gasket Connector (Disconnect engine harness from
valve cover gasket. Inspect for bent pins or corrosion. Connect VC G asket Breakout Harness to engine
harness and valve cover gasket. Turn the ignition switch to O N.)
Test Point
Spec Comment
CtoA
0 V to 0.25 V
If > 0.25 V, continue with next test point, C to ground.
C to gnd
0 V to 0.25 V
If > 0.25 V, control wire is shorted to V
REF
or B+, or an
open ground, open control circuit, or open solenoid
exists.
A to gnd 0 V to 0.25 V
If > 0.25 V, ground wire is shorted to V
REF
or B+.
Output State Test - Signal Check at Valve Cover Gas
ket Connector (Disconnect engine harness from
valve cover gasket. Connect VC Gasket Breakout H
arness to engine harness and valve cover gasket. Run
the Output State Tests. For help, see “Diagnost
ic Software Operation” in Section 3 (page 68) for procedure
to run the Low and High Output State Tests.)
Test State/Po in t Setting/Spec Comment
KOEO DMM set to V - DC
CtoA
0 V to 0.25 V
If > 0.25 V, disconnect VC Gasket Breako
ut Harness
from gask et . Connect 500 Ohm Res istor H
arness
between C and A and retest.
• If > 0.25 V, run the Low and High Output S
tate Test.
• If < 0.25 V, the concern is the valve c
over gasket,
UVC wiring, or brake shut-off valv
e.
Output State Test - Low DMM set to V - DC Toggling between the Low and High Output State Tests
can be done during this procedure.
CtoA
0 V to 0.25 V
If > 0.25 V, disconnect VC Gasket Breakout Harness
from gasket. Connect 500 Ohm Resistor Harness
between C and A and retest Output State Test - Low.
• If > 0.25 V the concern is the engine harness or
ECM, check for a short to B+ or V
REF
.
• If < 0.25 V, the concern is the valve cover gasket,
UVC wiring, or Brake Shut-off Valve.
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