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Diagnosis & Repair

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.
  1. Retrieve trouble codes. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If only DTC P0505 is displayed, go to next step. If other codes are displayed, diagnose and repair those codes first and retest.
  2. Check for loose, damaged or cracked air intake hose between throttle body and air cleaner. Check for loose or damaged dipstick, oil fill cap or PCV hose. Repair as necessary. If all components are okay, go to next step.
  3. Check air induction system. Ensure oil dipstick, oil filler cap, PCV system and all other air induction system components are intact and operating properly. Repair as necessary. If okay, go to next step.
  4. Check electric throttle control system. See THROTTLE CONTROLS in SYSTEM & COMPONENT TESTING article. Repair as necessary. If okay, go to next step.
  5. Check for open and short in harness and connector between throttle position sensor and ECM. Repair as necessary. If okay, check and replace ECM.
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