Throttle Position (Tp) Sensor Construction/Operation; Accelerator Pedal Position (App) Sensor Function - Mazda RX-8 2004 Service Highlights

THROTTLE POSITION (TP) SENSOR CONSTRUCTION/OPERATION

• The sensor is built into the throttle body and
detects the throttle valve opening angle.
• The Hall element design has been adopted for
the sensor.
• A non contact type sensor has been adopted to
improve durability.
• The TP sensor is composed of the main sensor
and sub sensor, and detects the throttle valve
opening angle with these two sensors (main and
sub).
• Even if a malfunction occurs in either one of the
sensors, the detection is performed with a normal
sensor and drive-by-wire control is maintained.
• If both the MAIN and SUB sensors for the TP
sensor malfunction, signals necessary for the drive-by-wire control are not input to the PCM and the drive-by-
wire control is disabled.
• However, even though the drive-by-wire control is disabled, the throttle valve opening angle necessary for
minimum driving is maintained mechanically.
TP Sensor Voltage Characteristics
TP SENSOR
HALL ELEMENT
SENSOR
MAGNET
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ACCELERATOR PEDAL POSITION (APP) SENSOR FUNCTION

• Detects how much the AP is depressed.
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01–40–48
CONTROL SYSTEM
PCM
SUB
VOLTAGE
CPU
CPU
MAIN
TP SENSOR
HIGH
SUB SENSOR
MAIN SENSOR
LOW
THROTTLE VALVE
SMALL
OPENING ANGLE
CHU014018910S02
VALVE BODY
THROTTLE
VALVE
CHU0140S053
LARGE
CHU0140S055
CHU014041600S01