15
being configured with traction control (either torque
limiting, differential braking or both), the traction control
condition dash lamp, will be illuminated as well as the
appropriate LEDs on the EC-17
™
controller diagnostic
display. The traction control dash lamp will be illuminated
until the traction control enable/disable switch is placed
in the traction control enabled position (traction control
operative).
4. Place the traction control enable/disable switch in the
traction control enabled position (traction control
operative), the traction control dash lamp should be off.
5. Before placing the vehicle in service, verify the
configuration and the system condition by turning the
ignition OFF then ON while observing the EC-17
™
controller diagnostic display. The diagnostic display
should indicate the desired configuration as described
under the section entitled EC-17
™
Controller
Configuration Display and no red LEDs should be
illuminated at the end of the self test.
6. If the configuration appears correct but the diagnostic
LEDs indicate a failure somewhere in the system, refer
to the General Configuration Information section and
use the Troubleshooting section of this manual to locate
and repair the diagnostic trouble code.
7. If the configuration is incorrect, the process can be
repeated as required. One common error is performing
the self configuration without toggling the traction control
enable/disable switch. This will prevent any traction
features from being activated. Note: The traction switch
must be toggled to configure traction, but must be placed
in the enable position to allow the traction lamp to flash.
TROUBLESHOOTING
IMPORTANT BEFORE TROUBLESHOOTING:
1. Determine if the vehicle is equipped with traction control.
The presence of a traction condition lamp on the dash
can be used.
2. Some vehicles are equipped with a traction control
"disabling switch." If so equipped, ENABLE THE
TRACTION SYSTEM BEFORE BEGINNING THE
TROUBLESHOOTING. THE TRACTION CONTROL
MUST BE DISABLED FOR DYNAMIC TESTING.
3. If the vehicle is equipped with traction control and is a
tandem axle unit, note the number of drive axles. The
"MID" diagnostic LED is used only on 6x4 vehicles.
GENERAL
While the EC-17
™
controller diagnostic display locates a
specific diagnostic trouble code area, it is still necessary to
confirm whether the problem may reside in the component
itself or the wiring. The following troubleshooting procedure
is devoted to narrowing the diagnostic trouble code to either
the wiring or a specific antilock or traction component. It
should be noted that ALL TROUBLESHOOTING BEGINS
BY OBSERVING THE ANTILOCK AND TRACTION
CONDITION LAMPS ON THE DASH. All troubleshooting
should begin by first performing the "Initial Start up
Procedure" and following the directions contained in it.
TROUBLESHOOTING TIPS
1. Begin by observing the dash condition lamp(s) and
performing the "Initial Start Up Procedure."
2. The troubleshooting technician should record all findings
and the action taken during the troubleshooting process.
3. No voltage or resistance tests are performed into the
EC-17
™
controller. All voltage and resistance tests are
performed by beginning at the wire harness half of the
connector and moving AWAY from the EC-17
™
controller
toward an antilock traction system component
(modulator, wheel speed sensor, etc.)
