Navistar International DT 466 Diagnostic/Troubleshooting Manual page 341

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
• When DTC 247 is active the amber ENGINE lamp
will be illuminated.
DTC 546
Engine brake control pressure below expected
range
• DTC 546 is set by the ECM when the brake control
pressure is less than injection control pressure 4
MPa (580 psi) for more than 3 seconds.
• DTC 546 can be set due to a bias low BCP
sensor or a failed BCP sensor.
Control Pressure (BCP) Sensor – Section 7.
• DTC 546 can be set due to an open control circuit
(power or ground), a failed brake shut-off valve, or
a failed brake shut-off valve solenoid.
• When DTC 546 is active the amber ENGINE lamp
is illuminated.
DTC 547
Engine brake control pressure above expected
range
• DTC 547 is set by the ECM when the brake
control pressure is greater than desired brake
control pressure by 4.5 MPa (653 psi) for more
than 3 seconds.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
• DTC 547 can be set due to an open signal ground,
V
V, or a failed BCP sensor. See "Brake Control
Pressure (BCP) Sensor – Section 7.
• DTC 547 can be set due to a control circuit short
to B+ or a brake shut-off valve stuck open.
• When DTC 547 is active the amber ENGINE lamp
is illuminated.
Tools
See "Brake • EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• VC Gasket Breakout Harness
• 12-Pin Breakout Harness
• 500 Ohm Resistor Harness
• Breakout Box
• Terminal Test Adapter Kit
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
shorted to a voltage source higher than 5.5
REF
337