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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect the oscilloscope between terminals M+ or M- and E1 of the ECM connectors. Start the engine. Check the waveform between terminals M+ or M- and E1 of the ECM connector when the engine is idling. See Figure. The correct waveforms are as shown. See Fig 1. The waveform frequency varies depending on the throttle opening. If okay, check and replace ECM. If not okay, go to next step.
    Fig 1: Identifying Oscilloscope Waveform Patterns
    G00239905Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Disconnect the throttle control motor and sensor connector. Measure the resistance between terminals No. 1 and 2 of the throttle control motor. See Fig 2. If resistance is 0.3-100 ohms at 68°F (20°C), go to next step. If not, replace throttle body.
    Fig 2: Identifying Throttle Control Motor & Sensor Connector Terminals
    G00239906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check for open and short in harness and connector between throttle control motor and sensor and ECM. Repair harness as necessary. If okay, replace ECM.
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