B -- REPLACE ECM See: Powertrain Management/Computers and Control Systems/Engine Control Module/Service and
Repair/Removal
A -- END
From 08/2009
2GR-FE ENGINE CONTROL: SFI SYSTEM: P2120,P2122,P2123,P2125,P2127,P2128,P2138: Throttle / Pedal Position Sensor / Switch
"D" Circuit
DESCRIPTION
HINT
- These DTCs relate to the accelerator pedal sensor assembly.
- This electronic throttle control system does not use a throttle cable.
The accelerator pedal sensor assembly is mounted on the accelerator pedal bracket and has 2 sensor circuits: VPA (main) and VPA2 (sub). This
sensor is a non-contact type. It uses Hall-effect elements in order to yield accurate signals, even in extreme conditions. The voltage, which is applied
to terminals VPA and VPA2 of the ECM, varies between 0 V and 5 V in proportion to the operating angle of the accelerator pedal (throttle valve). A
signal from VPA indicates the actual accelerator pedal operating angle (throttle valve opening angle) and is used for engine control. A signal from
VPA2 conveys the status of the VPA circuit and is used to check the accelerator pedal sensor assembly itself.
The ECM monitors the actual accelerator pedal operating angle (throttle valve opening angle) through the signals from VPA and VPA2, and controls
the throttle actuator according to these signals.
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