Monitoring Bcp Using Vc Gasket Breakout Harness - Navistar International DT 466 Diagnostic/Troubleshooting Manual

242
Monitoring BCP using VC Gasket Breakout
Harness
NOTE: Only do this procedure if directed here from
"Monitoring ICP using Gasket Breakout Harness."
This is an alternate method when an EST is not
available.
Tools
• VC Gasket Breakout Harness
• DMM
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.
NOTE: BCP should be zero, when engine brake is
inactive. However, BCP values may fluctuate as much
as 345 kPa (50 psi). Electromagnetic interference
(EMI) or ground shift can cause an insignificant
voltage shift that does not indicate a problem. This
should be equal to KOEO BCP signal voltage.
Figure 313 Valve cover gasket
1. Front of engine
2. Pass-through connector for BCP sensor
3. Pass-through connector for brake shut-off valve
4. Pass-through connector for ICP sensor
1. Disconnect engine harness connector from the
pass-through connector for the BCP sensor and
do steps 2 to 6.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
Figure 314
pass-through connector for BCP sensor
2. Connect VC Gasket Breakout Harness to the
3. Use DMM to measure BCP.
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. Turn the ignition switch to ON. (Do not start
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
VC Gasket Breakout Harness to
pass-through connector for the BCP sensor and
engine harness.
• Connect POS to green (signal circuit) and
NEG to black (ground circuit).
WARNING: To avoid serious personal injury,
engine.) Measure KOEO BCP signal voltage and
record on Diagnostic Form.
• If BCP signal voltage is above KOEO
specification, see "BCP Sensor Operational
Diagnostics" in Section 7.
• If BCP signal voltage
specification, continue to step 5.
is in KOEO