Navistar International DT 466 Diagnostic/Troubleshooting Manual page 538

534 7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS
Figure 503 VGT circuit diagram
NOTE: If an Actuator Control Voltage Check was not to specification, continue with this check.
Turn the ignition switch to OFF when disconnecting engine wiring harness connectors from components.
See truck Chassis Electrical Circuit Diagram Manual for circuit numbers, connector and fuse locations.
Actuator Control Voltage Check at ECM (Connect breakout box X-1 only to ECM and engine harness.
Engine harness is not connected to actuator harness. Connect 500 Ohm Resistor Harness between X1-18
and X1-6. Turn the ignition switch to ON. See "Diagnostic Software Operation" in Section 3 (page 68) for
procedure to do the Low and High Output State Tests.)
Test State/Point
KOEO
X1–18 to X1– 6
Output State Test - Low
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Setting/Spec
DMM set to V - DC
1
DMM set to V - DC
DMM set to duty
2
cycle
DMM set to V - DC
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Comment
If in specification, run the Low and High Output State
Tests.
If not in specification, disconnect engine harness from
breakout box harness and retest.
• If not in specification, run the Low and High Output
State Tests.
• If in specification, diagnose engine wiring harness.
Do Harness Resistance Check – VGT Actuator to
ECM (page 538).
Listen and observe to verify if crank lever of VGT
actuator moves. Toggling between the Low and High
Output State Tests can be done during this test.