2004 Hyundai Elantra L4-2.0L Copyright © 2008, ALLDATA 9.90 Page 1

Computers and Control Systems: Diagnostic Trouble Code Tests and Associated ProceduresP1505****Some values in these images are incorrect, refer to TSB - 30-36-024 for correct values****

DTC P1505 Idle Speed Central Actuator Signal Low of Coil #1

DESCRIPTION

The Idle Speed Control Actuator (ISCA) is installed on the throttle body and controls the intake airflow that is by passed around the throttle plate. Thefunction of the ISCA is to maintain idle speed according to various engine loads and conditions, and also to provide additional air during starting.Moreover, it performs electronic the dashpot during deceleration. The ISCA consists of an opening coil, a closing coil, and a permanent magnet. Basedon information from various sensors, the ECM controls both coils by grounding their control circuits. According to the control signals from the ECM,the valve rotor rotates to control the bypass airflow into the engine.

DTC Detecting Condition

Specifications

2004 Hyundai Elantra L4-2.0L Copyright © 2008, ALLDATA 9.90 Page 2

DTC Detecting Condition

Signal Waveform

2004 Hyundai Elantra L4-2.0L Copyright © 2008, ALLDATA 9.90 Page 3

Step 1 - 3

2004 Hyundai Elantra L4-2.0L Copyright © 2008, ALLDATA 9.90 Page 4

Step 4 - 5

INSPECTION PROCEDURES