5 HARD START AND NO START DIAGNOSTICS 159
Monitoring ICP using VC Gasket Breakout
Harness
NOTE: Do this procedure, if an EST is not available.
This is an alternate method.
Tools
• VC Gasket Breakout Harness
• Digital Multimeter (DMM)
Procedure
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, read all safety instructi on s in the “Safety
Information” section of this manual.
WARNING: To avoid serious personal injury,
possible death or damage to the engine or vehicle
- comply with the following:
When running the engine in the service bay, make
sure the parking brake is set, the transmission is
in neutral, and the wheels are blocked.
1. See “DT 466 Performance Specifications” –
Appendix A (page 595) or “DT 570 and HT 570
Performance Specifications” – Appendix B (page
619) and Section 7 for specifications, operational
voltages, and values. Record on Diagnostic
Form.
Figure 183 Valve cover ga
sket
1. Fr ont of engine
2. Pass-through connector f
or BCP sensor
3. Pass-through connector fo
r brake shut-off valve
4. Pass-throu gh connector fo
r ICP sensor
2. Disconnect engine harness connector from
pass-through connector for ICP sensor.
Figure 184 VC Gasket Breakout Harness
connector to pass-through connector for ICP
sensor
3. Connect VC Gasket Breakout Harness to
pass-through connector and engine harness.
WARNING: To avoid serious personal
injury, possible death, or damage to the
engine or vehicle – comply with the following:
When routing DMM leads, do not crimp the
leads, run the leads too close to moving parts,
or let the leads touch hot engine surfaces.
4. Use DMM to measure injection control pressure
(ICP signal voltage) KOEO.
• Connect POS to green (signal circuit) and
NEG to black (signal ground).
5. Record KOEO rea ding on Diagnos tic Form.
6. Take another measurement while cranking the
engine for 20 seconds.
7. Record reading on Diagnostic Fo rm.
• If ICP voltage is out of spec ification at KOEO
only, see “ICP Sensor” in Section 7 (page
457).
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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