P1127 TOYOTA – Malfunction in ETCS Actuator Power Supply Circuit

P1127 TOYOTA Possible Causes

• Faulty Electronic Throttle Control System (ETCS) actuator
• Electronic Throttle Control System (ETCS) actuator harness is open or short-circuited
• Electronic Throttle Control System (ETCS) circuit Poor electrical connection of the actuator circuit

Start by checking the “possible causes” listed above. Visually inspect the corresponding cable harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Symptoms

possible

• Check engine light on (or service engine soon warning light)

P1127 TOYOTA Meaning

Battery positive voltage is supplied to the +BM terminal of the Engine Control Module (ECM) even once when the ignition switch is in OFF position for the Electronic Throttle Control System (ETCS) control system.
If P1127 code is stored, the ECM cuts off power to the ETCS motor and magnetic clutch, and the ETCS valve is fully closed by the return spring.
However, the ETCS valve opening angle can be controlled by the accelerator pedal via the ETCS cable.