Parts for your 2017 Toyota Wish-Throttle position sensors

2017 Toyota Wish throttle position sensors: what they do and how to look after them

For the 2017 Toyota Wish (ZGE2# series, 1.8L 2ZR-FAE and 2.0L 3ZR-FAE Valvematic), a throttle position sensor is absolutely used. Toyota’s Electronic Throttle Control System – intelligent (ETCS‑i) on ZR engines employs dual throttle position sensors integrated into the throttle body with the throttle actuator, while a separate accelerator pedal position sensor sits on the pedal. This setup is described across Toyota New Car Features (NCF) for ZR engines, the Toyota Repair Manual for the ZGE2# platform, and is reflected in diagnostic coverage for DTCs like P0120–P0124 and P2135 that monitor throttle angle correlation. On this model, the TPS is part of the throttle body assembly and generally isn’t serviced separately.

The TPS tells the engine ECU exactly where the throttle plate is at any moment. On Valvematic engines the throttle plate often sits more open than a traditional setup, but the ECU still needs a precise, redundant signal for airflow modelling, idle control, emissions, cruise, and driveability. The ETCS‑i uses two opposing sensors for safety, if they disagree, it can put the car into limp mode to protect the engine and occupants.

• Common signs of TPS trouble: erratic idle, flat spots on take‑off, poor fuel economy, surging, a flashing check engine light, or limp‑home behaviour.
• Typical fault codes: P0120–P0124, P0220–P0229, P2135, often alongside throttle actuator or correlation codes.

Servicing-wise, the sensor itself isn’t a clean-and-carry-on item, it’s sealed into the throttle body. However, keeping the throttle bore clean can prevent sticky throttle behaviour that feels like a sensor fault. At regular services, a careful clean of the throttle plate and bore (engine off, battery connected, ignition off) with throttle‑body‑safe cleaner helps. Don’t force the plate open or flood the motor housing.

If replacement is needed, it usually means fitting a complete throttle body assembly:

• Use quality or genuine parts and a new gasket, check and clean the connector and harness for corrosion or damage.
• After installation, perform throttle/idle learning. A scan tool is ideal to run ETCS‑i calibration and clear codes.
• Verify live data: both throttle position signals should track smoothly and agree, confirm accelerator pedal sensor values, too.
• Finally, road‑test through a few kilometres of mixed driving to let trims and strategies settle.

Because the TPS is integral to the throttle body on the 2017 Wish, swapping just the sensor isn’t practical. That integration keeps the calibration spot‑on and ensures redundancy for safety, which is why Toyota bundles it with the actuator.

• Does the 2017 Toyota Wish have a throttle position sensor?

Yes. The 2017 Wish with ZR‑series engines uses ETCS‑i with dual throttle position sensors built into the throttle body assembly, plus a separate accelerator pedal position sensor. Toyota’s technical literature for ZR engines and the ZGE2# platform, along with standard OBD DTC coverage, confirms the presence and function of these sensors.

• Can the throttle position sensor be replaced on its own?

No. On this model the TPS is integrated with the throttle actuator in the throttle body. The fix for a failed TPS is replacing the complete throttle body assembly, fitting a new gasket, and carrying out a throttle/idle learn with a scan tool. It’s also smart to inspect the loom and connector before condemning the unit.

• What are the signs the TPS needs attention, and will a clean fix it?

Look for erratic idle, hesitation, surging, poor economy, or limp‑home with codes like P0120–P0124 or P2135. Cleaning the throttle bore can cure stickiness and minor idle quirks, but it won’t repair an internal sensor fault. If the sensor tracks poorly or the signals don’t correlate, replacement of the throttle body is the go.