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Diagnosis & Repair (Using OBD-II Scan Tool)

WARNING: This page is about a different car, the 2003 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the ECM hood. Turn the ignition switch ON. Measure voltage between terminal STA of the ECM connector E6 and body ground during engine cranking. See Fig 1. If 6 volts or more are present with ignition switch in START position, and no voltage is present with ignition switch in ON position, system is okay. Problem is intermittent. If not, go to next step.
    Fig 1: Identifying ECM STA Terminal
    G00244947Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Check ignition switch. See STEERING COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. Repair as necessary. If okay, go to next step.
  3. Check park/neutral position switch. See DTC P0705: PARK/NEUTRAL POSITION SWITCH MALFUNCTION . Replace switch as necessary. If okay, go to next step.
  4. Check for open in harness and connector between ECM and park/neutral position switch. See Fig 1. Repair as necessary. If okay, replace ECM.
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