Mazda 626 Station Wagon, Руководство по ремонту

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CONTROL SYSTEM
I ACCELERATOR POSITION SENSOR
Function
• The accelerator position sensor is installed on the accelerator pedal, and detects how much the accelerator
pedal is being depressed from the change in the resistance value (variable resistance).
(D
1
Accelerator position sensor
5 Accelerator position signal (monitor)
2
Accelerator pedal
6
Accelerator position signal (main)
3 External view 7 Power supply
4 GND
Structure/Operation
• The accelerator position sensor is a potentiometer type and works is the same way as the throttle position
sensor.
• The accelerator position sensor contains two circuits for detecting accelerator position: main circuit and
monitor circuit. As in previous models, the main circuit is used for the controls operated by the PCM (e.g. fuel
injection amount control). The monitor circuit is used for detecting malfunctions in the accelerator position
sensor.
• When voltage difference between the main and monitor circuits increases, the PCM determines that the
accelerator position sensor is malfunctioning and stores DTC P0120. Thus, a detection condition item has
been added to DTC P0120.
• The input voltage characteristic of the accelerator position sensor is as shown (figure 1.)
<D
1
Accelerator position sensor
2
PCM
3
Power supply
4 Main (input)
5 Monitor (input)
6
GND
7 CPU
8
Figure 1.
9 High
10
Low
11
Input voltage
12
Not accelerated
13 Fully accelerated
14 Accelerator pedal position
15
Close (accelerator pedal)
16 Open (accelerator pedal)
F 2-9