200 5 HARD START AND NO START DIAGNOSTICS
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+.
Figure 257 Relay terminal
NOTE: Engines could be wired diffe
rently, having
wiring harness connectors secur
ed to different relay
terminals. Trace wiring harnes
s from element to the
relay, to be sure that the correc
t relay terminal is
being tested.
4. Contact DM M positive lead to
relay terminal.
5. Record results on Diagnosti
cForm.
• If wiring resistan ce is > 5 Ω,r
epair 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
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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