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Engine Control System Trouble Shooting - No Codes: Other Toyota Echo I

Testing & Diagnostics ~2348 words

DOES NOT START

Engine Does Not Crank

  1. On all models except Prius, check battery and battery cables.
  2. On all models except Prius, check starter. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
  3. On all models except Prius, check starter relay. See appropriate STARTERS article in STARTING & CHARGING SYSTEMS.
  4. On A/T models except MR2 and Prius, check park/neutral position switch. See PARK/NEUTRAL POSITION SWITCH under ENGINE SENSORS & SWITCHES in appropriate SYSTEM & COMPONENT TESTING article.
  5. On Prius, the Hybrid Vehicle (HV) control Electronic Control Unit (ECU) or Motor Generator No. 1 (MG1) may be the problem. Consult authorized dealer for servicing.

No Initial Combustion

  1. Check Engine Control Module (ECM) power source circuit. See ENGINE CONTROL MODULE POWER SOURCE CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Highlander, Land Cruiser, MR2, Prius, RAV4, Sequoia, Sienna and 4Runner, check engine immobilizer system (if equipped). See appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
  3. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  4. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article. Also, check fuel pump switch. See «FUEL PUMP SWITCH (LAND CRUISER)»(ref-133222-S33326760552002021900000) under FUEL DELIVERY under FUEL SYSTEM in SYSTEM & COMPONENT TESTING - V6 & V8 article.
  5. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.
  6. On all models, check Engine Control Module (ECM) electrical connector for loose, damaged or corroded terminals and repair as necessary. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. If electrical connector is okay, check ECM ground circuits. See «WIRING DIAGRAMS»(ref-133228) article. Repair as necessary. If ground circuits are okay, replace ECM with a known-good ECM and retest.

No Complete Combustion

  1. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  3. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

DIFFICULT TO START

Difficult To Start & Engine Cranks Normally

  1. On Avalon, Camry, Camry Solara, Corolla, Highlander, Land Cruiser, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra and 4Runner, check starter signal circuit. See STARTER SIGNAL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Celica and ECHO, check starter signal circuit at STA terminal on Engine Control Module (ECM). See «WIRING DIAGRAMS»(ref-133228) article. For illustration of ECM location, see THEORY & OPERATION article. No other testing information is available from manufacturer.
  3. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  4. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  5. On with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  6. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.
  7. On all models, check engine compression. See MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in appropriate BASIC DIAGNOSTIC PROCEDURES article.

Difficult To Start When Engine Is Hot Or Cold

  1. On Avalon, Camry, Camry Solara, Corolla, Highlander, Land Cruiser, MR2, RAV4, Sequoia, Sienna, Tacoma, Tundra and 4Runner, check starter signal circuit. See STARTER SIGNAL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Celica and ECHO, check starter signal circuit at STA terminal on Engine Control Module (ECM). See «WIRING DIAGRAMS»(ref-133228) article. For illustration of ECM location, see «THEORY & OPERATION»(ref-133195) article. No other testing information is available from manufacturer.
  3. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  4. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  5. On MR2 with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  6. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

POOR IDLING

High Idle Speed

  1. Check A/C signal. A/C signal may also be referred to as A/C switch signal or compressor circuit. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  2. On MR2 with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  3. On all models, check Engine Control Module (ECM) power source circuit. See ENGINE CONTROL MODULE POWER SOURCE CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.

Low Idle Speed

  1. Check A/C signal. A/C signal may also be referred to as A/C switch signal or compressor circuit. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  2. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  3. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  4. On MR2 with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  5. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

Rough Idle

  1. Check engine compression. See MECHANICAL INSPECTION under PRELIMINARY INSPECTION & ADJUSTMENTS in appropriate BASIC DIAGNOSTIC PROCEDURES article.
  2. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  3. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  4. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

Surging

  1. Check Engine Control Module (ECM) power source circuit. See ENGINE CONTROL MODULE POWER SOURCE CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  3. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  4. On MR2 with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  5. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

POOR DRIVEABILITY

Hesitation/Poor Acceleration

  1. On Avalon, Camry 2.2L 4-cylinder gasolines models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On all models except MR2 and Prius, on models with electronic controlled automatic transaxle/transmission, check for problem with electronic controls for automatic transaxle/transmission. See appropriate ELECTRONIC CONTROLS article in AUTOMATIC TRANSMISSIONS.
  3. On Corolla, check A/C-cut control system circuit. See A/C-CUT CONTROL SYSTEM CIRCUIT under COMPUTERIZED ENGINE CONTROLS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article.
  4. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  5. On Prius, there may be a problem with the hybrid transaxle.
  6. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

Surging

  1. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  3. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

ENGINE STALLS

Engine Starts And Then Stalls

  1. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Celica, Corolla, ECHO, Highlander, MR2, Prius, RAV4, Sienna, Tacoma, Tundra 3.4L V6 and 4Runner, check fuel pump control circuit. See FUEL PUMP CONTROL CIRCUIT under COMPUTERIZED ENGINE CONTROLS in appropriate SYSTEM & COMPONENT TESTING article.
  2. On Land Cruiser, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY/ECU CIRCUIT test in «SELF-DIAGNOSTICS - LAND CRUISER»(ref-133209) article.
  3. On MR2 with sequential manual transaxle, check throttle body and components for Electronic Throttle Control System (ETCS). See THROTTLE BODY under IDLE CONTROL SYSTEMS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article. Models with sequential manual transaxle may be identified by the shift lever pattern which consists of "R", "N", "S" and "+" in place of the conventional type shift lever pattern and no clutch pedal is used.
  4. On Sequoia and Tundra 4.7L V8, check fuel pump control circuit. See DTC P1200: FUEL PUMP RELAY CIRCUIT test in appropriate SELF-DIAGNOSTICS article.

Engine Stall During A/C Operation

  1. Check A/C signal. A/C signal may also be referred to as A/C switch signal or compressor circuit. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.
  2. Check Engine Control Module (ECM) electrical connector for loose, damaged or corroded terminals and repair as necessary. For illustration of ECM location, see THEORY & OPERATION article. If electrical connector is okay, check ECM ground circuits. See «WIRING DIAGRAMS»(ref-133228) article. Repair as necessary. If ground circuits are okay, replace ECM with a known-good ECM and retest.

REFUELING PROBLEM

Note. On-Board Refilling Vapor Recovery (ORVR) system is used to recover fuel vapors into charcoal canister that are generated during refueling. Manufacturer provides procedure for only the models listed.

Unable/Difficult To Refuel

  1. On Avalon, Camry 2.2L 4-cylinder gasoline models, Camry 3.0L V6, Camry Solara, Corolla, ECHO, Highlander and Prius, a problem may exist in the On-Board Refilling Vapor Recovery (ORVR) system. Check fuel evaporative system. See FUEL EVAP SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.
  2. Check fuel evaporative system. See FUEL EVAPORATIVE SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in appropriate SYSTEM & COMPONENT TESTING article.

A/C SWITCH INDICATOR BLINKING

Note. Manufacturer provides procedure for only the models listed.

  1. On Camry 2.2L 4-cylinder and Camry Solara 2.2L 4-cylinder, check A/C compressor lock sensor circuit. See A/C COMPRESSOR LOCK SENSOR CIRCUIT under COMPUTERIZED ENGINE CONTROLS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article.
  2. On Camry 2.2L 4-cylinder and Camry Solara 2.2L 4-cylinder, check A/C evaporator temperature sensor circuit. See A/C EVAPORATOR TEMPERATURE SENSOR CIRCUIT under COMPUTERIZED ENGINE CONTROLS in «SYSTEM & COMPONENT TESTING - 4-CYLINDER»(ref-133221) article.

Intermittent Simulation

To reproduce the conditions creating an intermittent fault, use the following methods

  1. Lightly vibrate component. See «VIBRATION METHOD»(ref-133220-S20160155952002021900000) .
  2. Heat component. See «HEATING METHOD»(ref-133220-S29493464832002021900000) .
  3. Wiggle or bend wiring harness. See «VIBRATION METHOD»(ref-133220-S20160155952002021900000) .
  4. Spray component with water. See «WATER APPLICATION METHOD»(ref-133220-S02116777222002021900000) .

Monitor circuit/component voltage or resistance while simulating intermittent. If engine is running, monitor for diagnostic trouble codes. Use test results to identify a faulty component or circuit.

More articles — Engine Control System Trouble Shooting - No Codes