Navistar International DT 466 Diagnostic/Troubleshooting Manual page 325

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
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 by
4 MPa (580 psi) for more than 3.0 seconds.
• DTC 546 can be set due to a bias low BCP sensor
or a failed BCP sensor.
• 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. See "Brake
Shut-off Valve – Section 7.
• 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 of 4.5 MPa (653 psi) for more
than three 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
or a faulty BCP sensor.
• DTC 547 can be set due to a control circuit short
to B+ or a brake shut-off valve stuck open. See
"Brake Shut-off Valve – Section 7.
• When DTC 547 is active the amber ENGINE lamp
is illuminated.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• 3-Banana Plug Harness
• 500 Ohm Resistor Harness
• VC Gasket Breakout Harness
• UVC Pressure Breakout 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 V,
REF
321