Navistar International DT 466 Diagnostic/Troubleshooting Manual page 346

342 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 400 Brake Shut-off Valve circuit diagram
NOTE: Complete all pin-point diagnostics (ECM to valve cover gasket connector) before removing
valve cover for under-valve-cover diagnostics.
• Turn the ignition switch to OFF before disconnecting engine wiring harness connectors from components.
• See truck Chassis Electrical Circuit Diagram Manual for circuit numbers, connector and fuse locations.
Harness Resistance Check – Valve Cover Gasket Connector to ECM Chassis Ground (Turn the
ignition switch to OFF. Disconnect chassis connector 9260
engine wiring harness only.)
Test Point Spec
A to Pin A (9260) < 5 Ω
C to Pin A (9260) > 1 kΩ
WARNING: To avoid serious personal injury, possible death, or damage to the engine or vehicle,
always disconnect main negative battery cable first. Always connect the main negative battery cable
last.
Harness Resistance Check – Valve Cover Gasket Connector to Chassis Ground (Turn the ignition
switch to OFF. Disconnect chassis connector 9260
from valve cover gasket. Use disconnected negative battery cable for ground test point.)
A to gnd cable > 500 Ω
C to gnd cable > 1 kΩ
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Comment
If > 5 Ω, check for an open circuit.
If < 1 kΩ, check for short to ground within wiring harness.
1
. Disconnect negative battery cable. Disconnect harness
If < 500 Ω, check for short to ground.
If < 1 kΩ, check for short to ground.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
1
. Connect VC Gasket Breakout Harness to