3 DIAGNOSTIC SOFTWARE OPERATION 69
Diagnostic Trouble Codes
WARNING: To avoid serious personal injury,
possible death, or damage to the engine or
vehicle, make sure the transmission is in park
or neutral, parking brake is set, and wheels are
blocked before doing service bay diagnostics on
engine or vehicle.
Using EST
Accessing Diagnostic Trouble Codes (DTCs)
NOTE: When opening VIN+ session to fill out form
heading, the DTC window automatically appears.
1. TurntheignitionswitchtoON.
2. Select Com from the menu bar in the main
window, then select Open.
Figure 55 Menu bar Code/View
3. Select Code from the menu bar, then View for the
Diagnostic Trouble Code window.
Figure 56 Diagnostic Trouble Code window
Reading DTCs
ATA code: Codes associated with a Subsystem
Identifier (SID), Parameter Identifier (PID), and
Failure Mode Indicator (FMI)
DTC: Diagnostic Trouble Code
Status: Indicates active or inactive DTCs
• Active: With the ignition switch on, active
indicates a DTC for a condition currently in the
system. When the ignition switch is turned off,
an active DTC becomes inactive. (If a problem
remains, the DTC will be active on the next
ignition switch cycle and the EST will display
active/inactive.)
• Inactive: With the ignition switch on, inactive
indicates a DTC fo r a co n dition during a prev iou s
ignition switch cycle. When th e ignition switch
is turned to OFF, inactive DTCs from previous
ignition switch on cycles remain in the ECM
memory until cleared.
• Active/Inactive: With the ignition switch on,
active/inactive indicates a DTC for a c ondition
currently in the system and was present in a
previous ignition switch cycle, if the code was not
cleared.
Description:Defines each DTC
Clearing D TCs
Figure 57 Menu bar Code/Clear
1. Select Code from the menu bar, then select Clear.
NOTE: If unable to clear inactive DTCs, be sure
Diagnostic Trouble Code window is active by
clicking in the window area.
Using Cruise Switches
Accessing DTCs
NOTE: Read and be familiar with all steps and time
limits in this procedure before starting.
1. Set parking brake for the correct signal from the
Electronic System Controller (ESC).
2. TurntheignitionswitchtoON.(Donotcrankthe
engine.)
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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