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GS430 & LS430

  1. Connect scan tool to DLC3 to monitor engine RPM. See Figure. Remove engine cover. Start and warm engine to operating temperature. Turn A/C off. Use a stethoscope to listen for injector operating noise (or feel for vibration with finger).
  2. Increase engine speed to 2500 RPM. Release throttle lever. When throttle lever is released, injectors should stop operating momentarily until engine speed decreases to 1400 RPM. Shut engine off. Remove scan tool.
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