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Home >> Hyundai >> 2000 >> Tiburon Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1510, P1552: Idle Speed Control (ISC) Actuator Circuit Shorted >> Test Procedures

Test Procedures

  1. Turn ignition on. Connect scan tool to data link connector and verify DTC P1510 or P1552 is set. Turn ignition off. Disconnect ISC actuator harness connector. Turn ignition on. Measure voltage between ground and ISC actuator harness connector terminal No. 2 (Red/White wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in circuit between engine control relay and ISC actuator. When repairs are completed, clear DTC and verify system operation.
  2. Turn ignition on. Measure voltage between ground and ISC actuator harness connector terminal No. 1 (Brown/Black wire on Elantra; White/Black wire on Tiburon). If voltage is less than 0.5 volt, go to next step. If voltage is 0.5 volt or more, repair circuit between ISC actuator connector terminal No. 1 and ECM connector terminal No. 2 on Elantra or terminal No. 29 on Tiburon. When repairs are completed, go to next step.
  3. Turn ignition on. Measure voltage between ground and ISC actuator harness connector terminal No. 3 (White/Black wire on Elantra; Brown/Black wire on Tiburon). If voltage is less than 0.5 volt, go to next step. If voltage is 0.5 volt or more, repair circuit between ISC actuator connector terminal No. 3 and ECM connector terminal No. 29 on Elantra or terminal No. 2 on Tiburon. When repairs are completed, clear DTC and verify system operation.
  4. Turn ignition off. Measure resistance between ISC actuator terminals No. 1 and 2, and between terminals No. 2 and 3. If resistance is 10-14 ohms at 68°F (20°C), ensure ECM connector terminals are clean and tight. If connector and terminals are okay, replace ISC actuator. Clear DTC and verify system operation. If problem persists, replace ECM. If resistance is not 10-14 ohms, replace ISC actuator. When repairs are completed, clear DTC and verify system operation.
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