Electronic Foot Pedal Assembly (Efpa) & Throttle Position Sensor; Figure 12: Electronic Foot Pedal Assembly - Volvo D13 Manual

Section 01: ENGINE
2. ELECTRONIC FOOT PEDAL ASSEMBLY (EFPA) & THROTTLE POSITION SENSOR
The Electronic Foot Pedal Assembly (EFPA) connects the accelerator pedal to a Throttle Position Sensor
(TPS). The (TPS) is a device, which sends an electrical signal to the Motor Control Module (MCM). The
TPS varies in voltage depending on how far the pedal is depressed. The system is installed in the space
normally occupied by a mechanical foot pedal. The (EFPA) has maximum and minimum stops that are
built into the unit during manufacturing (Fig. 24). The (TPS) converts the operator's foot pedal input into a
signal for the MCM.
When installed by the equipment manufacturer, the TPS should not require adjustment. If the TPS is
suspected of being misadjusted, confirm that the sensor is installed in accordance with the
manufacturer's specifications. It is recommended that the idle count be at 50 or higher with a full throttle
count of up to 200.
The TPS is self-calibrating and therefore has no optimum closed throttle or wide open throttle count
value. If the counts are within the 50 to 200 range, the sensor is properly set.

FIGURE 12: ELECTRONIC FOOT PEDAL ASSEMBLY

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Monitor the (TPS) at the controls as you move it through its full stroke. Be sure there is no misalignment
or obstruction preventing the smooth movement of the TPS through the full stroke. Using a diagnostic
data reader, check that the idle and full throttle position counts do not fall within the error zones. The error
zones occur when the idle position is less than 14 counts, or when the full throttle position is more than
233 counts. Should these conditions occur, the CPC will signal diagnostic codes of 21-12 for idle error
and 21-23 for wide-open throttle error.
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PA1578 SECTION 01 REVISED AUGUST 2012