Navistar International DT 466 Diagnostic/Troubleshooting Manual page 349

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Output State Test - Low DMM set to V - DC
2 to gnd
Output State Test -
High
2 to gnd
Figure 402 Brake Shut-off Valve circuit diagram
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
0 V to 0.25 V
DMM set to V - DC
B+ ± 0.5 V
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Toggling between the Low and High Output State Tests
can be done during this procedure.
If > 0.25 V, and all pin-point diagnostic tests (ECM to
valve cover gasket) were in spec, the valve cover gasket
or UVC wiring are suspect. Check for short to V
Toggling between the Low and High Output State Tests
can be done during this procedure.
If < B+, and all pin-point diagnostic tests (ECM to valve
cover gasket) were in spec, the valve cover gasket or
UVC wiring are suspect. Check for short to ground,
open control wire, or open ground wire. Do Harness
Resistance Checks (page 346).
If equal to B+, and all pin-point diagnostic tests (ECM
to valve cover gasket) were in spec, do Solenoid
Resistance Check – Brake Shut-off Valve (page 346).
345
or B+.
REF