6 PERFORMANCE DIAGNOSTICS 239
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
•DMM
• ICP System Test Adapter
• Oil sample line with inline s hu t-off valve
• Clear container (for oil sample)
• Socket or wrench (EOT sensor)
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.
Figure 310 Valve cover gasket
1. Fr ont of engine
2. Pass-through connector for BCP sensor
3. Pass-through connector for brake shut-off valve
4. Pass-throu gh connector for ICP sensor
1. See “DT 466 Performance Specifications” –
Appendix A (page 595), “DT 570 and HT 570
Performance Specifications” – Appendix B (page
619) or Section 7 “Operational Voltages Checks”
– for specifications and record on Diagnostic
Form.
2. Disconnect engine harness connector from valve
cover gasket for ICP sensor and do steps 3 to 10.
Figure 311 VC Gasket Breakout Harness to
pass-through connector for ICP sensor
3. Connect VC G asket Breakout Harness to the
pass-through connector for ICP sensor and
engine harness.
4. Use DMM to measure ICP.
• Connect POS to green (signal circuit) and
NEG t o black (g ro und c ircuit).
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. Secure the
DMM and leads in the cab so as not to obstruct
the operator.
5. TurntheignitionswitchtoON.(Donotstart
engine.) Measure KOEO ICP signal voltage and
record on Diagnostic Form.
• If ICP voltage is higher than specification, the
ICP sensor or circuitry may be at cause. This
will cause a lower tha n n orm al in jection
control p ressure command. See “ICP
Sensor” in S e ct ion 7.
• If ICP vo lta g e is in KOEO sp e cification,
continue to step 6.
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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