Navistar International DT 466 Diagnostic/Troubleshooting Manual page 347

7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Harness Resistance Check – 12-Pin Connector to ECM Chassis Ground (Turn the ignition switch to OFF.
Connect 12-pin Breakout Harness to chassis wiring harness only. Disconnect chassis connector 9260
4 to Pin A (9260) < 5 Ω
Harness Resistance Check – 12-Pin Connector to Chassis Ground (Turn the ignition switch to OFF.
Disconnect chassis connector 9260
use chassis side for test point. Use disconnected negative battery cable for ground test point.)
4 to gnd cable < 500 Ω
Harness Resistance Check – Valve Cover Gasket Connector to 12-Pin Connector (Connect VC
Gasket Breakout Harness to engine wiring harness only. Connect 12-Pin Breakout Harness to engine
wiring harness only.)
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A to 4 < 5 Ω
Harness Resistance Check – Valve Cover Gasket Connector to ECM (Connect VC Gasket Breakout
Harness to engine wiring harness only. Connect breakout box X2 to engine wiring harness only.)
C to X2-18 < 5 Ω
Resistance Check – Valve Cover Gasket, UVC Wiring, and Brake Shut-off Valve/Solenoid (Connect VC
Gasket Breakout Harness to valve cover gasket only.)
A to C 10 Ω ± 2 Ω •
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Connector 9260 is a 2-wire connector usually located in the battery box. Pin A is the ground connection for the ECM
and IDM. See truck Chassis Electrical Circuit Diagram Manual for complete chassis side ECM and IDM ground circuit
information.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
If > 5 Ω, check for open in chassis wiring harness ground circuit.
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. Disconnect negative battery cable. Disconnect 12–pin connector and
If > 500 Ω, check for short to ground.
If > 5 Ω, check for open in actuator ground.
If > 5 Ω, check for open in control wire.
If > 12 Ω, the concern is the valve cover gasket, UVC wiring, or
brake shut-off valve/solenoid. Do Harness Resistance Check – Valve
Cover Gasket Connector to UVC Connector (page 346) and Solenoid
Resistance Check – Brake Shut-off Valve (page 346).
• If < 8 Ω, a short to ground exists. The concern is the valve cover
gasket, UVC wiring, or brake shut-off valve/solenoid.
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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