Parts for your 2016 Toyota Wish-Throttle position sensors

2016 Toyota Wish throttle position sensors: what they do and how to look after them

On the 2016 Toyota Wish (ZGE2# series, 2ZR-FAE/3ZR-FAE Valvematic engines), throttle position sensors are absolutely used. Toyota’s Electronic Throttle Control system (ETCS-i) integrates dual throttle position sensors inside the throttle body alongside an electric actuator. This is outlined in Toyota New Car Features for ZR engines (Valvematic & ETCS‑i) and the Wish ZGE2# Repair Manual sections covering the “Throttle Body with Motor Assembly” and diagnostics for DTCs P0120, P0122, P0123, P0220, P0222, P0223, P2135. OE supplier listings for the Aisin throttle body used on these engines also specify built-in TPS circuits rather than a separate bolt-on sensor.

Purpose-wise, the TPS pair (often labelled VTA1/VTA2) tells the engine ECU exactly where the throttle plate sits, enabling smooth acceleration, stable idle, cruise control behaviour and emissions control. The ECU cross-checks the two TPS signals for safety and compares them with the accelerator pedal position sensor, so if anything’s off, the car can drop into limp mode to protect itself.

For servicing, the TPS isn’t a standalone, replaceable widget on this model, it’s part of the throttle body assembly. If testing confirms a TPS fault, the fix is to replace the throttle body as a unit. After replacement—or if the battery’s been disconnected—carry out throttle/idle relearn (ETCS initialization) with a proper scan tool to set the closed-throttle reference. Toyota’s repair procedures spell this out in the ETCS-i and DTC flowcharts.

• Common symptoms of TPS/throttle body issues: erratic idle, hesitation, poor fuel economy, cruise control dropping out, and warning lights with codes like P0120–P0124 or P2135.
• Maintenance tips: every 40,000–60,000 km, consider a careful throttle body clean to remove carbon. Don’t force the plate by hand, and avoid drowning the shaft area with solvent—keep it light and controlled.
• Diagnosis pointers: with a scan tool, check live data for smooth, matching VTA1/VTA2 voltages and correlation with the pedal sensor. Any spikes, drop-outs or mismatches point to wiring or internal sensor faults.

Replacement basics: disconnect the battery, relieve intake vacuum, remove the intake duct, unplug the throttle connector, and unbolt the throttle body. Fit a new gasket, torque evenly, reconnect, then perform the ETCS/throttle relearn. It’s worth inspecting the harness and connector pins for corrosion while you’re there. Getting this right keeps the Wish driving crisply and avoids annoying limp-home episodes.

Does the 2016 Toyota Wish have a separate throttle position sensor I can replace?

No. On this model the TPS is built into the throttle body with the motor. If the TPS fails, the usual repair is to replace the complete throttle body assembly and perform a throttle/idle relearn with a scan tool.

What are the signs of a failing TPS on a 2016 Wish?

Things like unstable idle, hesitation, sudden loss of power or limp mode, and a check engine light are common. Scan for codes such as P0120–P0124, P0220–P0223 or P2135, and look at live data for VTA1/VTA2 irregularities.

Will cleaning the throttle body fix TPS problems?

Cleaning can help sticky throttle plates and idle issues caused by carbon, but it won’t repair a faulty internal sensor. If data or diagnostics point to a TPS fault, the throttle body assembly needs replacement, followed by a proper relearn.