User guide

14
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.
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-16
™
controller diagnostic display locates a
specific problem area, it is still necessary to confirm whether
the problem resides in the component itself or the wiring.
The following troubleshooting procedure is devoted to
narrowing the problem 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-16
™
controller. All voltage and resistance tests are
performed by beginning at the wire harness half of the
connector and moving AWAY from the EC-16
™
controller
toward an antilock traction system component
(modulator, wheel speed sensor, etc.)
4. If a problem mysteriously reoccurs and no apparent
cause can be detected during troubleshooting, closely
inspect the quality of the power supply to the antilock
system. Check the vehicle wiring, wiring connectors
AND the alternator. Defects in these components can
cause false failure indications.