Specifications

© Wired Rite Systems, Inc. 800-538-7483 www.wiredrite.com Docsst-4-01.8 Rev 0 Page 9
TROUBLESHOOTING
If a problem is encountered, the following procedure can be used to troubleshoot the system, and
identify and x some of the more common problems. If the problem is not easily identied, please
contact Wired Rite for assistance at 1-800-538-7483. Before beginning the troubleshooting, please
check these ve items:
System Lock-up. The processor on the SST-4 board can go into a locked-up situation if
the power is toggled on and off at a rapid rate. If this occurs the processor must be reset by
disconnecting the power to the board for several seconds and then reconnecting it.
Ground. The ground wire of the SST-4 must NOT be connected to the chassis, but routed
directly to the negative side of the battery.
On-board LED indicators. An additional troubleshooting resource is the on-board LED
indicators. These functions are described in Table 2. SST-4 Green LED indicators.
Diagnostic Display. If an error is detected by the SST-4, and parameter “L” is set to 1, the
display will ash to identify the problem circuit. Refer to Table 6 for locating the cause of
the fault.
Storing and clearing faults. If a fault occurs, the SST-4’s on board diagnostics will
record in which circuit the fault occurred and save the fault into memory. To clear all of
the recorded faults, press and hold the “UP” and “DOWN” buttons on the board for three
seconds or remove board power. This will erase the volatile memory and place the system
back in the “Run mode”
Troubleshooting Procedure
Begin with all inputs to the board OFF. Remove the enclosure lid if present to allow visual
inspection of the 4-character display and the relay status indicators.
Supply power to the SST-4 board. The 4-character displays should be active, for example
with two blinking decimal points. Check for board power on TB1 pin 3 (GND is available
on TB1 pin 1.) If there is no power, check the circuit breaker.
Turn the ignition ON. This should illuminate the relay indicators D5 (Starter Relay), D6
(Aux Relay), and D7 (Ignition Relay). If one or more indicators are not illuminated, then
that circuit may not be receiving power from the ignition splice. Check the associated
wiring path to ensure that the circuit is enabled. You may need to manually reset the
manual circuit breakers near each relay by pressing the yellow tab. NOTE: The Aux Relay
manual circuit breaker can be placed in two positions, depending on whether the system
incorporates a separate E-power battery. If there is a separate E-power battery, then the
circuit breaker should be connected between J5 and J6; otherwise it should be connected
between J6 and J7.
Turn ON the SST-4 MASTER switch. This is sometimes labeled “MACHINE” or “PTO” or
“AERIAL ENABLE” to indicate non-truck functions. This should activate the hour meter
on the 4-character display. If not, check that the signal from the SST-4 MASTER signal is
being applied to J1 Pin 3.
Apply START signal from the aerial switch. Indicator D2 should be illuminated. If not,
verify that the START signal is being applied to J1 Pin 5. Remove the START signal.
Apply THROTTLE signal from the aerial switch. Indicator D2 should be illuminated. If not
verify that the THROTTLE signal is being applied to J1 Pin 4. Remove the THROTTLE
signal.
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