What does code P1652 mean?

Q: What does code P1652 mean?

Idle Air Control Valve Control Circuit. P1652 on Toyota vehicles indicates that the engine control module (ECM) has detected an electrical fault in the idle air control (IAC) valve control circuit, which regulates engine idle speed by bypassing air around the throttle plate. The ECM monitors the circuit for abnormal voltage or current and sets this code when the signal falls outside the expected range, often resulting in a fixed or erratic idle.

DTC codes / Toyota codes / P1652

P1652 · ToyotaIdle Air Control Valve Control Circuit

P1652 on Toyota vehicles indicates that the engine control module (ECM) has detected an electrical fault in the idle air control (IAC) valve control circuit, which regulates engine idle speed by bypassing air around the throttle plate. The ECM monitors the circuit for abnormal voltage or current and sets this code when the signal falls outside the expected range, often resulting in a fixed or erratic idle.

SystemPowertrain

Code typeToyota specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

Guidance is general and written for Toyota vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.