7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 471
Figure 470 ICP circuit diagram with UVC Pressure Sensor Breakout Harness
Operational Voltage Checks for ICP Sensor with UVC Pressure Sensor Breakout Harness (Check with
UVC Pressure Sensor Breakout Harness connected to UVC connector and sensor.)
NOTE: These check are done only if an EST is not available. Do not use this method to measure ICP while
the engine is running.
Test Point
EST voltage readings:
Signal to ground
Spec Checks
3to1 0.15Vto0.3V
0 psi (0 kPa)
Atmospheric pressure with key-on
engine-off
3to1
See Performance Specifications
.
Minimum at engine cranking speed
ICP Diagnostic Trouble Codes
DTC 124 = Signal voltage was < 0.039 V for m ore tha n 0.1 second
DTC 125 = Signal voltage was > 4
.9 V for more than 0 .1 second
DTC 332 = Signal voltage was > 1.625 V, key-on engine-off 7.99 kPa (1160 psi)
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.
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