15.4 - Wiring Harness Continuity And Resistance; 15.5 - Relay Operation - Navistar International DT 466 Diagnostic/Troubleshooting Manual

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15.4 – Wiring Harness Continuity and Resistance
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.
When the voltage at element is not B+, measure the
resistance (continuity) between the element and relay.
1. Turn the ignition switch to OFF.
2. Use the DMM to check wiring harness continuity
and measure resistance.
Figure 256 Element terminal
3. Connect DMM negative lead to the element
terminal that is not B+.
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
5 HARD START AND NO START DIAGNOSTICS
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
Figure 257 Relay terminal
NOTE: Engines could be wired differently, having
wiring harness connectors secured to different relay
terminals. Trace wiring harness from element to the
relay, to be sure that the correct relay terminal is
being tested.
4. Contact DMM positive lead to relay terminal.
5. Record results on Diagnostic Form.
If wiring resistance is > 5 Ω, repair or replace,
•
if necessary.
If wiring resistance is < 5 Ω, continue with test
•

15.5 - Relay Operation.

15.5 – Relay Operation
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, read all safety instructions in the "Safety
Information" section of this manual.
EGES-270-1