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Home >> Chevrolet >> 2004 >> Optra Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC - DTC P1402 To DTC P1661 >> DTC P1512 >> Circuit Description

Circuit Description

The idle speed control (ISC) assembly is a throttle body with an integrated motor that is used to control the engine speed at idle. The engine control module (ECM) commands the integrated ISC motor to adjust the throttle angle for idle speed control. The ECM uses a high control circuit and a low control circuit to command the ISC motor. If the ECM detects that the actual ISC motor position can not be commanded to the desired position, this DTC sets.

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