P1194 Lexus Limp Home – TPS2 Position Malfunction

Possible causes

– Faulty Electronic Throttle System (ETS) Motor
– Faulty Electronic Throttle System (ETS)
– Electronic Throttle System(ETS)unit
– Electronic Throttle System(ETS) harness is open or shorted
– Electronic Throttle System(ETS) circuit poor electrical connection

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)
– Engine Limp Mode Fail-Safe Mode)

P1194 Lexus Description

The Electronic Throttle System (ETS) consists of ETS unit, ETS-motor, Accelerator Position Sensor (APS),Throttle Position Sensor (TPS) and Limp home valve.

Among above-mentioned parts, Limp home valve is attached under the throttle body and helps air to flow from the outside through this valve to the engine combustion chamber to prevent the vehicle from engine stall when Powertrain Control Module (PCM) detects ETS system malfunction.