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Celica & ECHO Toyota Tacoma I рестайлинг

Engine Control System & Component Testing - 4-CYLINDER 10 illustrations ~3267 words

Celica & ECHO

Testing information is not available from manufacturer.

  1. If Toyota hand-held tester is available, 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 at driver's side of instrument panel. (Scheme 198) 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. 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»(ref-133220) article.
  3. Check for open in Black/White wire (starter signal wire) and electrical connectors between starter relay and terminal No. 11 at Engine Control Module (ECM) electrical connector E6 on 3-speed A/T and M/T models, or terminal No. 11 at ECM electrical connector E9 on 4-speed A/T models. See «WIRING DIAGRAMS»(ref-133228) article. ECM is located behind stereo on instrument panel, just in front of center console. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. Starter relay is located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower and may be marked as ST relay. For ECM electrical connector terminal identification (Scheme 208)and (Scheme 209).
  4. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
  5. Remove necessary components for access to Engine Control Module (ECM). See «ENGINE CONTROL MODULE»(ref-133226-S19804702592002021900000) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article. Remove bolts from ECM so electrical connectors can be accessed on ECM.
  6. Note ECM electrical connector terminals. (Scheme 208)and (Scheme 209). On 3-speed A/T and M/T models, using voltmeter, check voltage between body ground and terminal No. 11 (Black/White wire) at ECM electrical connector E6 with ignition switch in START position and engine cranking. On 4-speed A/T models, using voltmeter, check voltage between body ground and terminal No. 11 (Black/White wire) at ECM electrical connector E9 with ignition switch in START position and engine cranking. On all models, this is the STA terminal at ECM.
  7. On all models, 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»(ref-133220) article.
  8. Check for open and short in Black/White wire and electrical connectors between starter relay and terminal No. 11 at ECM electrical connector E6 on 3-speed A/T and M/T models, or terminal No. 11 at ECM electrical connector E9 on 4-speed A/T models. See «WIRING DIAGRAMS»(ref-133228) article. This is the starter signal wire. Starter relay is located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower and may be marked as ST relay.
  9. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.
  1. If Toyota hand-held tester is available, 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 at driver's side of instrument panel. (Scheme 200) 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. 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»(ref-133220) article.
  3. Check for open and short in White/Red wire between starter relay and starter fuse, defective starter fuse, and for open and short in Blue wire and electrical connectors between starter fuse and terminal No. 16 at Engine Control Module (ECM) electrical connector E7. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower. ECM is located behind glove box. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. For ECM electrical connector terminal identification (Scheme 211)
  4. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  5. Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article.
  6. Note ECM electrical connector terminals. (Scheme 211) Using voltmeter, check voltage between body ground and terminal No. 16 (Blue wire) at ECM electrical connector E7 with ignition switch in START position and engine cranking. (Scheme 211) 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»(ref-133220) article.
  7. Check for open and short in White/Red wire between starter relay and starter fuse, defective starter fuse, and for open and short in Blue wire and electrical connectors between starter fuse and terminal No. 16 at ECM electrical connector E7. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side front corner of engine compartment, just in front of strut tower.
  8. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  1. If Toyota hand-held tester is available, 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 at driver's side of instrument panel. (Scheme 201) 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. 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»(ref-133220) article.
  3. Check for open and short in Black wire between starter relay and starter fuse, defective starter fuse, and for open and short in Black wire and electrical connectors between starter fuse and terminal No. 11 at Engine Control Module (ECM) electrical connector E3. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side rear corner of engine compartment, just in front of strut tower and may be marked as ST relay and ST fuse. ECM is located on inside of firewall, directly behind driver's seat and luggage compartment. For illustration of ECM location, see THEORY & OPERATION article. To remove components for access to ECM, see «ENGINE CONTROL MODULE»(ref-133226-S19804702592002021900000) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article. For ECM electrical connector terminal identification (Scheme 212)
  4. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  5. Remove necessary components for access to Engine Control Module (ECM). ECM is located on inside of firewall, directly behind driver's seat and luggage compartment. See «ENGINE CONTROL MODULE»(ref-133226-S19804702592002021900000) under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION - 4-CYLINDER article. Remove bolts and disconnect ECM with electrical connectors from inside of firewall.
  6. Note ECM electrical connector terminals. (Scheme 212) Using voltmeter, check voltage between body ground and terminal No. 11 (Black wire) at ECM electrical connector E3 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»(ref-133220) article.
  7. Check for open and short in Black wire between starter relay and starter fuse, defective starter fuse, and for open and short in Black wire and electrical connectors between starter relay and terminal No. 11 at ECM electrical connector E3. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side rear corner of engine compartment, just in front of strut tower and may be marked as ST relay and ST fuse.
  8. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

Testing information is not available from manufacturer.

  1. If Toyota hand-held tester is available, 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 at driver's side of instrument panel. (Scheme 203) 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. 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»(ref-133220) article.
  3. Check for open and short in Black/White wire between starter relay and starter fuse, defective starter fuse, and for open and short in Black/Red or White wire and electrical connectors between starter fuse and terminal No. 7 (Black/Red or White wire) at Engine Control Module (ECM) electrical connector E8. There are 2 different wiring harnesses used. Wire color at between starter fuse and terminal No. 7 at ECM may vary according to wiring harness used. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side front corner of engine compartment and may be marked as ST relay and ST fuse. ECM is located near passenger's side kick panel, just below instrument panel. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. For ECM electrical connector terminal identification (Scheme 214)
  4. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  5. Remove glove box for access to Engine Control Module (ECM). For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article.
  6. Note ECM electrical connector terminals (Scheme 214) Using voltmeter, check voltage between body ground and terminal No. 7 (Black/Red or White wire) at ECM electrical connector E8 with ignition switch in START position and engine cranking. There are 2 different wiring harnesses used. Wire color at terminal No. 7 at ECM may vary according to wiring harness used. 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»(ref-133220) article.
  7. Check for open and short in Black/White wire between starter relay and starter fuse, defective starter fuse, and for open and short in Black/Red or White wire and electrical connectors between starter fuse and terminal No. 7 at ECM electrical connector E8. This is the starter signal circuit between starter relay and ECM. See «WIRING DIAGRAMS»(ref-133228) article. Starter relay and starter fuse are located in fuse/relay box at driver's side front corner of engine compartment and may be marked as ST relay and ST fuse.
  8. If starter fuse, wiring harness or electrical connector is defective, replace fuse or repair wiring harness or electrical connector as necessary. If starter fuse, wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM. On models equipped with engine immobilizer system, if ECM is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  1. If Toyota hand-held tester is available, 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 at driver's side of instrument panel. (Scheme 204) 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. 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»(ref-133220) article.
  3. Check for open in Black/White wire between park/neutral position switch (A/T) or clutch start switch (M/T) and terminal No. 7 at Engine Control Module (ECM) electrical connector E5. This is the starter signal circuit to ECM. See «WIRING DIAGRAMS»(ref-133228) article. ECM is located behind glove box. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. For ECM electrical connector terminal identification (Scheme 215) Park/neutral position switch is located on side of transmission and clutch start switch is located near top of clutch pedal.
  4. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) 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»(ref-133195) article.
  6. Note ECM electrical connector terminals. (Scheme 215) Using voltmeter, check voltage 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»(ref-133220) article.
  7. Check for open in Black/White wire between park/neutral position switch (A/T) or clutch start switch (M/T) and terminal No. 7 at ECM electrical connector E5. This is the starter signal circuit to ECM. See «WIRING DIAGRAMS»(ref-133228) article. Park/neutral position switch is located on side of transmission and clutch start switch is located near top of clutch pedal.
  8. If wiring harness or electrical connector is defective, repair as necessary. If wiring harness and electrical connectors are okay, check ECM ground circuit. See «WIRING DIAGRAMS»(ref-133228) article. If ECM ground circuit is defective, repair ground circuit as necessary. If ECM ground circuit is okay, replace ECM.

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