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Home >> Toyota >> 2001 >> 4Runner Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics >> Diagnostic Tests >> DTC P0505: Idle Control System Malfunction >> Circuit Description
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Circuit Description

Idle speed is controlled by Electronic Throttle Control System (ETCS). ETCS uses throttle control motor to operate throttle valve opening angle to obtain target idle speed. DTC is set when idle speed continues to vary greatly from target speed. Possible causes are:

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