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Starter Signal Circuit: Sienna

  1. If using scan tool, go to next step. If scan tool is not available, go to step  5.
  2. Connect scan tool to data link connector No. 3. See Figure. Turn ignition on and then turn scan tool on. Read STA signal display on scan tool with ignition on and with ignition in START position and engine cranking. The STA signal display should read OFF with ignition on and ON with ignition in START position. If STA signal display is not as specified, go to next step. If STA signal display is as specified, diagnose by symptom. See TROUBLE SHOOTING - NO CODES article.
  3. Check for open in wiring harness and electrical connectors between ECM and park/neutral position switch. See appropriate wiring diagram in WIRING DIAGRAMS article. ECM is located behind glove box, just above passenger's side lower instrument panel cover. For illustration of ECM location, see THEORY & OPERATION article. Park/neutral position switch is located on side of transaxle.
  4. If wiring harness or electrical connector are defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
  5. Remove passenger's side lower instrument panel cover for access to ECM. For illustration of ECM location, see THEORY & OPERATION article. Note ECM terminals. See Figure. Using voltmeter, check voltage between body ground and terminal No. 7 (Gray wire) at ECM electrical connector E8 with ignition in START position and engine cranking. This is the STA terminal at ECM.
  6. Voltage should be 6 volts or more. If voltage is not within specification, go to next step. If voltage is within specification, diagnose by symptom. See TROUBLE SHOOTING - NO CODES article.
  7. Check for open in wiring harness and electrical connectors between ECM and park/neutral position switch. See appropriate wiring diagram in WIRING DIAGRAMS article. Park/neutral position switch is located on side of transaxle.
  8. If wiring harness or electrical connector are defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See appropriate wiring diagram in WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. If ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.
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