Inspection Procedure

HINT

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit
• Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction

1. READ VALUE USING TECHSTREAM (COOLANT TEMP) 
   1. Connect the Techstream to the DLC3
   2. Turn the engine switch on (IG)
   3. Turn the Techstream ON
   4. Enter the following menus: Powertrain / Engine / Data List / Coolant Temp.
   5. Read the value displayed on the Techstream

      Standard: Same as actual engine coolant temperature. 

      Result 

      RESULT CHART
      
      

      Temperature Displayed	Proceed to
      -40°C (-40°F)	A
      140°C (284°F)	B
      Same as actual engine coolant temperature	C

      HINT

      • If there is an open circuit, the Techstream indicates 40°C (-40°F)
      • If there is a short circuit, the Techstream indicates 140°C (284°F)

   B: Go to step  4

   C: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

   A: Go to next step 

2. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN SENSOR) 
   1. Disconnect the engine coolant temperature sensor connector
   2. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side
   3. Connect the Techstream to the DLC3
   4. Turn the engine switch on (IG)
   5. Turn the Techstream ON
   6. Enter the following menus Powertrain / Engine / Data List / Coolant Temp.
   7. Read the value displayed on the Techstream

      Standard: 140°C (284°F) 

   8. Reconnect the engine coolant temperature sensor connector
   Fig 1: Identifying Engine Coolant Temperature Sensor Connector E40
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 3 

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR  (See REMOVAL )

3. READ VALUE USING TECHSTREAM (CHECK FOR OPEN IN ECM) 
   1. Disconnect the engine coolant temperature sensor connector.
   2. Connect terminals THW and E2 of the ECM connector.

      HINT:

      Before checking, do visual and contact pressure checks on the ECM connector.

   3. Connect the Techstream to the DLC3.
   4. Turn the engine switch on (IG).
   5. Turn the Techstream ON.
   6. Enter the following menus. Powertrain / Engine / Data List / Coolant Temp
   7. Read the value displayed on the Techstream

      Standard: 140°C (284°F) 

   8. Reconnect the engine coolant temperature sensor connector
   Fig 2: Identifying Engine Coolant Temperature Sensor And ECM Circuit With ECM Connector Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM  (See REMOVAL )

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

4. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN SENSOR) 
   1. Disconnect the engine coolant temperature sensor connector
   2. Connect the Techstream to the DLC3.
   3. Turn the engine switch on (IG)
   4. Turn the Techstream ON
   5. Enter the following menus Powertrain / Engine / Data List / Coolant Temp
   6. Read the value displayed on the Techstream

      Standard: -40°C (-40°F) 

   7. Reconnect the engine coolant temperature sensor connector
   Fig 3: Identifying Engine Coolant Temperature Sensor And ECM Circuit
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to step 5 

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR  (See REMOVAL )

5. READ VALUE USING TECHSTREAM (CHECK FOR SHORT IN ECM) 
   1. Disconnect the ECM connector.
   2. Disconnect the engine coolant temperature sensor connector
   3. Connect the Techstream to the DLC3
   4. Turn the engine switch on (IG).
   5. Turn the Techstream ON
   6. Enter the following menus- Powertrain / Engine / Data List / Coolant Temp
   7. Read the value displayed on the Techstream

      Standard: -40°C (-40°F) 

   8. Reconnect the engine coolant temperature sensor connector.
   9. Reconnect the ECM connector
   Fig 4: Identifying Engine Coolant Temperature Sensor And ECM Circuit With ECM Connectors Terminals
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM  (See REMOVAL )

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR