Specifications

Test Procedures
1. Operating in a
high-temperature
environment.
2. Exceeding normal
truck duty cycle.
Reduce load size.
Increase cycle time.
3. Verify correct
operation of heat sink
sensor.
Use handheld
programmer to
check that heat sink
reading is
approximately room
temperature after
truck has cooled to
room temperature.
Logic
The controller will reduce current to the traction motor when the controller exceeds
85°C (185°F). When controller cools below this level, normal traction performance will
return.
LED
Code
Dash
Display
Model Programmer Display
4,3
Code
43
All
Under Temp Cutback
Condition
Controller heat sink is
too cold.
Truck Response
Reduced Traction
Performance
Possible Causes and
Test Procedures
1. Operation in a cold
temperature
environment.
2. Verify correct
operation of heat sink
sensor.
Use handheld
programmer to
check that heat sink
reading is
approximately room
temperature after
truck has cooled to
room temperature.
Circuit Description
Logic
The controller will reduce current to the traction motor when the controller is below
−25°C (−13°F). When controller warms above this level, normal traction performance
will return.
Control Card Functional Test
Refer to Figure 22 for the following procedures.
1. Follow all safety precautions as listed at the beginning of this section prior to performing any
electrical checks.
2. Ensure Battery is fully charged.
a. Verify continuity between battery negative (at battery) and −B terminal (at controller).
3. Check for loose connections or damaged wiring between control card and controller.
a. Verify connection at the controller.
b. Very wire harness connection at the base of the steer handle.
4. Connect Curtis 1307 handset and go to tester function. Refer to 1307 Programmer Handset in this
section.
a. Look for battery voltage to be 25V approximately. If not, verify battery and connections.
b. Check for throttle accelerator output to be 95% or more at full throttle and to be at 0% at neutral
position. If not, go to Step 6.
c. Check for lift switch, fork low switch, belly switch, neutral switch (if is a legacy card version), and
horn switch input to alternate between on and off when switch is pressed and released. If not, go
to Step 6.
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