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ELECTRONIC ACCELERATOR AND
RETARD PEDALS
The accelerator pedal provides a signal to the Truck
Control Interface (TCI) when the operator requests
power. The retard pedal provides a signal to the
Propulsion System Controller (PSC) when the
operator requests retarding. The pedal signals are
processed by the analog card in the respective panel
for use by the system controllers to provide the
desired mode of operation.
As the operator depresses the pedal, the internal
potentiometer's wiper is rotated by a lever. The
output voltage signal increases in proportion to the
angle of depression of the pedal.
Repair and initial adjustment procedures are
discussed in the following. Refer to AC Drive System
Electrical Checkout Procedure for final calibration of
the pedal potentiometer after installation in the truck.
Removal
NOTE: Repair procedures for the retard and
accelerator pedal are identical. The retard pedal is
mounted on the brake pedal. Refer to Section J for
instructions for removing and installing the electronic
pedal on the brake actuator.
NOTE: Note the routing and clamp location of the
wiring harness. Proper wire routing is critical to
prevent damage during operation after reinstallation.
1. Disconnect the pedal wiring harness from the
truck harness connector.
2. Remove mounting cap screws, lockwashers
and nuts, and remove the pedal assembly.
Installation
1. Install the pedal assembly using the mounting
cap screws, lockwashers and nuts.
2. Connect the pedal wiring harness to the truck
wiring harness.
3. Use the DID panel to calibrate the pedal
potentiometer according to the instructions in
the AC Drive System Electrical Checkout
Procedure.
E2-46
Disassembly
Assembly
Electrical Propulsion System Components
1. Remove the screws for cable clamps (1, Figure
2-11). The clamps can remain attached to wiring
harness (2).
2. Remove
the
mounting
potentiometer (3).
1. Position the potentiometer with the flat side
toward the potentiometer cover and install it on
the pedal shaft as follows:
a. Align the cutouts in the shaft with the
potentiometer drive tangs.
b. Press the potentiometer onto the shaft until it
bottoms against the housing.
2. Install the mounting screws.
3. Attach cable clamps (1) and tighten the screws
securely.
4. Inspect the assembly and verify proper wiring
clearance during operation of the pedal through
the full range of travel.
FIGURE 2-7. TYPICAL ELECTRONIC PEDAL
1. Cable Clamp
2. Wiring Harness
screws
and
3. Potentiometer
10/06 E02020
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