7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 383
DTC 113
Electrical system voltage B+ out of range low
• DTC 113 is set when the ECM detects less than
7.0 V at Pin X3–3 for more than 0.5 second.
• DTC 113 can be set by a inoperative alternator
or ECM power relay, discharged batteries, or
increased resistance in the battery feed circuits.
• If the condition causing DTC 113 is intermittent,
the code will change from active to inactive status.
DTC 113 will not illuminate the amber ENG INE
lamp.
DTC 626
Unexpected reset fault
• DTC 626 is set when power is interrupted to the
ECM. Loose or dirty connections at fuses, relay
connections, and battery or ground cables can
cause the ECM to power down.
• After circuit becomes intact, the ECM will reboot.
Erratic engine performance can occur. Turning
engine ignition switch OFF and then ON will cause
thecodetochangefromactivetoinactivestatus.
• When DTC 626 is active, monitor the voltage
at ECM P in X4–1 and X4–2. Examine for
intermittent connections in the power feed wiring.
TheESTcanbeusedtoindicateDTCsand
display the V
IGN
voltage measured by the ECM to
Pin X3–3.
• DTC 626 will not illuminate the amber ENGINE
lamp.
When DTC 112, 113, or 626 is active, see truck
Chassis Electrical Circuit Diagram Manual for circuit
numbers, connector and fuse locations.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Box
• Relay Breakout Harness
• Terminal Te st Adapter Kit
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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