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Home >> Lexus >> 2003 >> GS 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0010: Camshaft Position "A" Actuator Circuit (Bank 1) Or DTC P0020: Camshaft Position "A" Actuator Circuit (Bank 2) >> Diagnosis & Repair (Using OBD-II Scan Tool)

Diagnosis & Repair (Using OBD-II Scan Tool)

  1. Start engine and warm it up. Disconnect OCV connector. Apply battery positive voltage between terminals of OCV. See Figure. Check engine speed. If idle is rough or engine stalls, go to next step. If idle is not rough or engine does not stall, replace OCV.
  2. Inspect system using oscilloscope. Turn ignition switch on and check the waveform between terminals OCV+ and OCV- of the ECM connector. The correct waveform is shown in the illustration. See Figure. Waveform frequency ("A") is lengthened as the engine speed becomes higher. If okay, go to next step. If not okay, check and replace ECM.
  3. Check for open and short in harness and connector between OCV and ECM. Repair as necessary. If okay, check for intermittent wiring problems.
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