178 5 HARD START AND NO START DIAGNOSTICS
Possible Causes
Low battery voltage
• Failed batteries
• High-resistance at battery cable connections
• Wiring to the IDM
Low or no battery voltage to the IDM main power
relay
• High-resistance or an open power feed circuit to
the IDM or IDM main power relay.
• The I D M pow e r circuit fuse in ba tt ery box may be
open.
• IDM main power relay may have failed.
•V
IGN
circuit problem
• Failed IDM
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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