TURN ANGLE POTENTIOMETER INSTALLATION
SX TRANSISTOR CONTROL Page 58
July 1999
SECTION 8.0 AUTOCALIBRATION OF ACCELERATOR,
BRAKE AND STEER ANGLE POTENTIOMETERS
Section 8.0 General
If Function 22 is set to a value of 250 or greater, the control
will auto calibrate the accelerator, brake and steer angle
potentiometers in succession. Individual auto calibration
routines are detailed below.
Section 8.1 Calibration of the Accelerator Potentiometer
When calibrating the accelerator pot, program Function 22
to a value between 15 and 20, and then exit programming
mode. Cycle the key switch on and off to store the function
setting.
When returning the key switch to the “ON” position, make
sure that the forward, reverse and start switches are open,
and that the seat switch is closed. If one of these
conditions is not met, a “-83” status code will appear on
the dash display. Once all of the above conditions have
been met, four “A” ’s will appear on the dash display:
AAAA
When the four “A” ’s are displayed, close the forward
directional switch, with the accelerator pedal fully
released. The dash display should show three “A” ’s:
AAA
Return the forward switch to the open position, and the
dash display should show two “A” ’s:
AA
Fully depress the accelerator pedal and close the forward
switch. Only one “A” should be displayed:
A
Reopen the forward switch. The truck will either return to a
normal operating state or a “-86” status code will appear
on the dash display. If the “-86” code appears, either the
full accelerator pedal voltage was greater than 4.5 volts, or
the voltage span from no pedal depression to full pedal
depression was less than 2.6 volts. Either condition
requires external adjustment to the accelerator pot prior to
repeating the process above.
Section 8.2 Calibration of the Steer Angle Potentiometer
When calibrating the steer angle pot, program Function 22
to a value between 30 and 35, and then exit programming
mode. Cycle the key switch on and off to store the function
setting.
When returning the key switch to the “ON” position, make
sure that the forward, reverse and start switches are open,
and that the seat switch is closed. If one of these
conditions is not met, a “-83” status code will appear on
the dash display. Once all of the above conditions have
been met, four “U” ’s will appear on the dash display:
UUUU
When the four “U” ’s are displayed, close the forward
directional switch, with the steering wheel positioned to
keep the wheels straight ahead. The dash display should
show three “U” ’s:
UUU
Return the forward switch to the open position, and the
dash display should show two “U” ’s:
UU
Close the forward switch again. Only one “U” should be
displayed:
U
Reopen the forward switch. The truck will either return to a
normal operating state or a “-86” status code will appear
on the dash display. If the “-86” code appears, either the
center position for the steer angle pot is less than 1.90 volts
or greater than 2.40 volts. Either condition requires
external adjustment to the steer angle pot prior to repeating
the process above.
Section 8.3 Calibration of the Brake Potentiometer
When calibrating the brake pot, program Function 22 to a
value between 40 and 45, and then exit programming mode.
Cycle the key switch on and off to store the function
setting.
When returning the key switch to the “ON” position, make
sure that the forward, reverse and start switches are open,
and that the seat switch is closed. If one of these
conditions is not met, a “-83” status code will appear on
the dash display. Once all of the above conditions have
been met, four “-“ ’s will appear on the dash display:
----
When the four “-“ ’s are displayed, close the forward
directional switch, with the brake pedal fully released. The
dash display should show three”-“ ’s:
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