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Starter Signal Circuit: Tacoma

  1. If using Toyota hand-held tester, go to next step. If Toyota hand-held tester is not available, go to step  5.
  2. Connect hand-held tester to data link connector No. 3. See Figure. Turn ignition on and then turn hand-held tester on. Read STA signal display on hand-held tester with ignition on and with ignition switch in START position and engine cranking. The STA signal display should read OFF with ignition on and ON with ignition switch 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 and short in Black/White wire and electrical connectors between terminal No. 7 at Engine Control Module (ECM) electrical connector E5 and park/neutral position switch (A/T models) or clutch start switch (M/T models). See WIRING DIAGRAMS article. This is the STA terminal at ECM. Park/neutral position switch is located on side of transmission. Clutch start switch is located near top of clutch pedal. ECM is located behind glove box. For illustration of ECM location, see THEORY & OPERATION article. For ECM electrical connector terminal identification, see Figure.
  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 WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
  5. Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see THEORY & OPERATION article. Note ECM electrical connector terminals. See Figure.
  6. Using voltmeter, check voltage between body ground and terminal No. 7 (Black/White wire) at ECM electrical connector E5 with ignition switch in START position and engine cranking. This is the STA terminal at ECM. 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 and short in Black/White wire and electrical connectors between terminal No. 7 at ECM electrical connector E5 and park/neutral position switch (A/T models) or clutch start switch (M/T models). See WIRING DIAGRAMS article. Park/neutral position switch is located on side of transmission. Clutch start switch is located near top of clutch pedal.
  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 WIRING DIAGRAMS article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
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