Navistar INTERNATIONAL DT 466 User Manual

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 461
ICP Operational Diagnostics
Figure 465 ICP circuit diagram with VC Gasket Breakout 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.
Circuit Checks for ICP – ECM to Valve Cover Connector (Use EST, DMM, 500 Ohm Resistor Harness,
and VC Gasket Breakout Harness connected to e ngine harness only.)
Test Condition Spec Checks
Harness disconnected from valve
cover gasket connector using
EST
0V
If voltage > 0.039 V, check ICP signal f or short to V
REF
or B+.
Voltage from Pin B (Blue) of VC
Gasket Breakout Harness to
ground using DMM
5V±0.5V
If voltage > 5.5 V, check V
REF
for short to B +. If voltage is
<4.5V,checkV
REF
for open or short to ground.
500 Ohm Resistor Harnes
s
connected between Pin A
(Green) and Pin B (Blue
)ofVC
Gasket Breakout Harne
ss us ing
EST
5V
If voltage < 4.9 V, check
ICP signal for open or short to
ground.
— D isconnect connector 9
260
1
. Measure resistance
from Pin A to Pin A of conn
ector 9260 (spec > 1 kΩ)
to check for short to gr
ound within wiring harness.
— D isconnect negative
battery cable. Mea sure
resistance from Pin
A (spec > 1 kΩ)togroundcable
to chec k for short t o
ground.
— U se a breakout box to
measure resistance from
X1-20 to Pin A (spec
<5Ω) to check for open circuit.
Resistance from Pin C (Black) of
VC Gasket Breakout Harness to
<5Ω If resistance is > 5 Ω, check for open or h igh resistance
between ECM and VC Gasket Breakout Harness
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