Navistar International DT 466 Diagnostic/Troubleshooting Manual page 467

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
ICP Operational Diagnostics
Figure 466 ICP circuit diagram with UVC Pressure Sensor Breakout Harness
Circuit Checks for ICP Sensor – ECM to ICP Sensor (If Circuit Checks for ICP Sensor – ECM to Valve
Cover Gasket Connector are complete and test results are to specification for all test conditions, but an
active code remains, remove valve cover following procedure in the Engine Service Manual. Use EST,
DMM, 500 Ohm Resistor Harness, and UVC Pressure Sensor Breakout Harness to UVC connector only.)
Test Condition
ICP sensor connector removed
from UVC connector using EST
Voltage from Pin 2 (Blue) of
UVC Pressure Sensor Breakout
Harness to ground using DMM.
500 Ohm Resistor Harness
connected between Pin 3
(Green) and Pin 2 (Blue) of
UVC Pressure Sensor Breakout
Harness using EST
Resistance from Pin 1 (Black) of
UVC Pressure Sensor Breakout
Harness to ECM chassis ground
ECM chassis ground (Pin A of
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Spec Checks
0 V If voltage > 0.039 V, check ICP signal for short to V
or B+.
5 V ± 0.5 V
If voltage > 5.5 V, check V
< 4.5 V, check V
5 V If voltage < 4.9 V, check ICP signal for open or short to
ground.
— Disconnect connector 9260
from Pin 3 to Pin A of connector 9260 (spec > 1 kΩ)
to check for short to ground within wiring harness.
— Disconnect negative battery cable. Measure
resistance from Pin A to ground cable to check for
short to ground.
— Use a breakout box to measure resistance from
X1-20 to Pin 3 (spec < 5 Ω) to check for open circuit.
< 5 Ω If resistance is > 5 Ω, check for open or high resistance
between ECM and UVC connector. Use a breakout box
to measure resistance from X1-6 to Pin 1 (spec < 5 Ω).
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
for short to B+. If voltage is
REF
for open or short to ground.
REF
1
. Measure resistance
463
REF