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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. If any other DTCs are displayed, diagnose and repair those DTCs first and retest. If only DTC P0505 is displayed, go to next step.
  2. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. If problem exists, repair as necessary. If problem does not exist, go to next step.
  3. Check Electronic Throttle Control System (ETCS). See THROTTLE CONTROL MOTOR under MOTORS & RELAYS in SYSTEM & COMPONENT TESTING - LX470 article. Replace components as necessary. If okay, go to next step.
  4. Check for open and short in harness and connector between electric position sensor and ECM. Repair as necessary. If okay, replace ECM.
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