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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 Hand-Held Tester)

Diagnosis & Repair (Using Hand-Held Tester)

  1. Start engine and warm it up. Connect the hand-held tester and select the VVT from the ACTIVE TEST menu. Check engine speed when operating OCV by hand-held tester. When VVT system is OFF (OCV is OFF), engine speed is normal. When VVT system is ON (OCV is ON), idle is rough or engine stalls. If okay, check for intermittent problems. If not okay, go to next step.
  2. Disconnect OCV connector. Apply battery positive voltage between the terminals of the OCV. See Fig 1. Check the engine speed. If idle is rough or engine stalls, go to next step. If not, replace OCV.
    Fig 1: Applying Voltage To OCV Connector Terminals
    G00165093Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. 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 Fig 2. Waveform frequency ("A") is lengthened as the engine speed becomes higher. If okay, go to next step. If not okay, check and replace ECM.
    Fig 2: Checking OCV Signal Waveform
    G00239922Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. 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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