36
TK 61555-2-MM-EN
LED Functions
The LED is illuminated when the associated circuit output is energized. Not all output LEDs
shown are used on single temperature trailer applications.
LED #
Function
LED #
Function
LED 3
K2 Preheat
LED 19
Liquid Injection Valve (Not Used)
LED 4
K4 Damper Solenoid
LED 20
LED 5
K3 High Speed Solenoid
LED 21
Heartbeat (Note 1)
LED 6
K1 Run Relay
LED 22
LED 7
K5 Diesel/Electric Relay
LED 23
K9 On/Off Relay
LED 8
LED 24
K6 Fuel Solenoid Pull-In
LED 9
LED 25
K7 Starter Relay
LED 10
LED 27
ETV-D (Note 2)
LED 11
LED 28
ETV-B (Note 2)
LED 17
Loader Valve 1 (Not Used)
LED 29
ETV-A (Note 2)
LED 18
Alternator Excite
LED 30
ETV-C (Note 2)
Notes:
1.
The Status LED flashes once per second when the Base Controller is powered and operating normally.
The Status LED flashes several times per second during a flash load. The Status LED is on without
flashing during reboot and when the Base Controller is under test. The Status LED flashes twice within
one second followed by one second off if a CAN communication error is present.
2.
ETV LEDs are illuminated when the respective ETV output is energized. On applications without ETV,
the LEDs may be illuminated.
Smart FET Outputs
A Smart FET is a self protecting output device used for the functions shown in the table. Smart
FETs halt current flow if an over-current condition exists and generate an alarm. The Smart FET
will resume normal operation when the alarm is cleared and current flow is within limits. Smart
FETs are not field repairable. A fuse is not required.
SMART REEFER 3 (SR-3) Microprocessor Controller
Refer to the SR-3 Trailer Single Temperature SL-400e, SLX/SLXe/SLXi Series Diagnostic Manual
TK 56487 for complete service information about the Microprocessor Controller and related
components.
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ntt:: A ServiceWatch download can be helpful when diagnosing a problem in a unit with
an SR-3 Controller. Therefore, it is recommended that a ServiceWatch download be
preformed to help diagnose a problem. A ServiceWatch download must be
preformed before contacting the Thermo King Service Department for assistance in
diagnosing a problem. Refer to the SR-3 Trailer Single Temperature SL-400e, SLX/
SLXe/SLXi Series Diagnostic Manual TK 56487 for information about downloading
the ServiceWatch Data Logger and viewing the data.
Fuse Link
The fuse link is located in the positive battery cable. The fuse link protects the electric system
from a short in the 2 circuit. If the fuse link burns out, check for a grounded 2 wire before
replacing the fuse link. Replace the fuse link by replacing the positive battery cable.
