7GR-FKS ENGINE CONTROL  SFI SYSTEM  P012011  Throttle / Pedal Position Sensor / Switch "A" Circuit Short to Ground  

The throttle position sensor is built into the throttle body with motor assembly and detects the opening angle of the throttle valve. This sensor is a non-contact type sensor. It uses Hall-effect elements in order to yield accurate signals even in extreme driving conditions, such as at high speeds as well as very low speeds.

The throttle position sensor has 2 sensor circuits, VTA1 and VTA2, each of which transmits a signal. VTA1 is used to detect the throttle valve angle and VTA2 is used to detect malfunctions in VTA1. The sensor signal voltages vary between 0 V and 5 V in proportion to the throttle valve opening angle, and are transmitted to the VTA1 and VTA2 terminals of the ECM.

As the valve closes, the sensor output voltage decreases and as the valve opens, the sensor output voltage increases. The ECM calculates the throttle valve opening angle according to these signals and controls the throttle actuator in response to driver inputs. These signals are also used in calculations such as air fuel ratio correction, power increase correction and fuel-cut control.

4.188,1.063 4.385,0.583 4.385,0.583 4.542,0.583 false 5.74,1.51 5.51,0.281 5.51,0.281 5.229,0.281 false 5.323,1.875 5.802,2.323 false 4.979,2.229 5.313,2.531 false 1.021,2.583 0.927,1.781 0.927,1.781 0.792,1.781 false 1.49,1.219 1.063,2.188 false 0.969,2.958 0.583,3.563 false 1.073,3.344 1.552,3.75 false 4.677,1.469 4.896,1.656 false 1.573,1.052 2.49,1.25 0.917,0.198 10 false Magnet 0.24,1.708 1.156,1.906 0.917,0.198 10 false IC No. 1 0.323,3.656 1.24,3.854 0.917,0.198 10 false IC No. 2 1.594,3.74 2.51,3.938 0.917,0.198 10 false Magnet 0.104,4.115 1.979,4.406 1.875,0.292 10 false Throttle Position Sensor 0.146,4.51 2.021,4.802 1.875,0.292 10 false Note: 0.167,4.708 3.375,5.333 3.208,0.625 10 false The throttle valve opening angle transmitted through sensor terminal VTA1 is expressed as a percentage. 0.167,5.417 3.365,5.635 3.198,0.219 10 false Between 10% and 22%: Throttle valve fully closed 0.167,5.75 3.365,5.969 3.198,0.219 10 false Between 64% and 96%: Throttle valve fully open 0.167,6.115 3.365,6.333 3.198,0.219 10 false Approximately 19.4%: Fail safe angle (7°) 3.531,0.188 5.271,0.479 1.74,0.292 10 false Line indicating VTA2 x 0.8 2.5,0.677 4.24,0.969 1.74,0.292 10 false Sensor Output Voltage (V) 4.604,0.51 5.604,0.865 1,0.354 10 false Fail-safe Angle 5.385,2.531 5.781,2.938 0.396,0.406 10 false VTA1 3.896,3.51 6.094,3.844 2.198,0.333 10 false Throttle Valve Opening Angle (°) 3.875,3.896 6.01,4.115 2.135,0.219 10 false *: During fail-safe control 3.719,4.76 5.917,5.094 2.198,0.333 10 false Characteristics of sensor output: 3.75,5.198 7.156,5.51 3.406,0.313 10 false VTA2 x 0.8 is approximately equal to VTA1 + 1.11 V 5.823,2.375 6.427,2.75 0.604,0.375 10 false 1.11 V 4.281,1.365 4.677,1.771 0.396,0.406 10 false VTA2 3.75,0.99 4.01,1.396 0.26,0.406 10 false 5.0 3.667,1.188 4,1.594 0.333,0.406 10 false 4.65 3.75,1.917 4.26,2.146 0.51,0.229 10 false 2.6* 3.688,2.063 4.021,2.469 0.333,0.406 10 false 2.25 3.667,2.438 4.25,2.656 0.583,0.219 10 false 0.97* 3.656,2.604 3.99,3.01 0.333,0.406 10 false 0.69 4.156,2.854 4.49,3.26 0.333,0.406 10 false 7 3.979,3.271 4.313,3.677 0.333,0.406 10 false 0 6.271,3.292 6.604,3.698 0.333,0.406 10 false 86 1.688,2.771 2.083,3.177 0.396,0.406 10 false VTA2 1.677,2.385 2.073,2.792 0.396,0.406 10 false VTA1 1.677,2.021 2.26,2.375 0.583,0.354 10 false VCTA 1.708,3.125 2.104,3.531 0.396,0.406 10 false ETA 4.698,3.188 5.719,3.406 1.021,0.219 10 false Usable Range 2.417,4.073 3.333,4.271 0.917,0.198 10 false ECM

HINT:

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When throttle position sensor DTCs are output, check the throttle valve opening angle using the GTS. Enter the following menus: Powertrain / Engine / Data List / Throttle Position Sensor No.1 Voltage and Throttle Position Sensor No.2 Voltage.

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Throttle Position Sensor No.1 Voltage is the VTA1 signal, and Throttle Position Sensor No.2 Voltage is the VTA2 signal.

Reference (Normal Condition):

When Accelerator Pedal Fully Released		When Accelerator Pedal Fully Depressed (Engine Running)
Throttle Position Sensor No.1 Voltage (VTA1)	Throttle Position Sensor No.2 Voltage (VTA2)	Throttle Position Sensor No.1 Voltage (VTA1)	Throttle Position Sensor No.2 Voltage (VTA2)
0.6 to 1.1 V	2.1 to 3.1 V	3.2 to 4.8 V (Not fail-safe)	4.6 to 4.98 V (Not fail-safe)

The ECM uses the throttle position sensor to monitor the throttle valve opening angle. If the VTA1 terminal voltage is less than the threshold, the ECM will illuminate the MIL and store this DTC.

When this DTC is stored, the ECM enters fail-safe mode. During fail-safe mode, the ECM cuts the current to the throttle actuator, and the throttle valve is returned to a 7° throttle valve opening angle by the return spring. The ECM then adjusts the engine output by controlling the fuel injection (intermittent fuel-cut) and ignition timing, in accordance with the accelerator pedal angle, to allow the vehicle to continue running at a minimal speed. If the accelerator pedal is depressed firmly and gently, the vehicle can be driven slowly.

Fail-safe mode continues until a pass condition is detected, and the ignition switch is turned off.

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.