Inspection Procedure

HINT:

• If DTCs related 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 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 OUTPUT DTC 
   1. Connect Techstream to the DLC3.
   2. Turn the power switch ON (IG) and turn Techstream ON.
   3. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.
   4. Read the DTCs.

      Result 

      RESULT CHART
      
      

      Display (DTC Output)	Proceed To
      P0115	A
      P0117	B
      P0118	C

   B:  Go to step  5

   C:  Go to step  3

   A: Go To Next Step 

2. READ VALUE OF TECHSTREAM (ENGINE COOLANT TEMPERATURE) 
   1. Connect Techstream to the DLC3.
   2. Turn the power switch ON (IG).
   3. Turn Techstream ON.
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
   5. Read the value.
   6. Measure the coolant temperature using a thermometer and compare the value with the value displayed on Techstream.

      Temperature value: 

      Almost same as the actual engine coolant temperature. 

      Result 

      RESULT CHART
      
      

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

      HINT:

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

   B:  Go to step  5

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: Go To Next Step 

3. READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the E1 engine coolant temperature sensor connector.
      Fig 1: Identifying E1 Engine Coolant Temperature Sensor Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect terminals 1 and 2 of the engine coolant temperature sensor wire harness side connector.
   3. Turn the power switch ON (IG).
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp. Read the value.

      OK: 

      Temperature value: 140C (284°F) 

   5. Reconnect the engine coolant temperature sensor connector.

   OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMP. SENSOR 

   Fig 2: Identifying Engine Coolant Temperature Sensor Wire Harness Side Connector Terminals 1 And 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go To Next Step 

4. READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN ECM) 
   1. Disconnect the E1 engine coolant temperature sensor connector.
      Fig 3: Identifying E1 Engine Coolant Temperature Sensor Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Connect terminals THW and E2 of the E4 ECM connector.

      HINT:

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

   3. Turn the power switch ON (IG).
   4. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp. Read the value.

      OK: 

      Temperature value: 140°C (284°F) 

   5. Reconnect the engine coolant temperature sensor connector.
      Fig 4: Identifying ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM 

5. READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the E1 engine coolant temperature sensor connector.
   2. Turn the power switch ON (IG).
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
   4. Read the value.

      OK: 

      Temperature value: -40°C (-40°F) 

   5. Reconnect the engine coolant temperature sensor connector.

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

   Fig 5: Identifying E1 Engine Coolant Temperature Sensor Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go To Next Step 

6. READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN ECM) 
   1. Disconnect the E4 ECM connector.
      Fig 6: Identifying E4 ECM Connector Terminal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the power switch ON (IG).
   3. Enter the following menus: Powertrain / Engine and ECT / Data List / Coolant Temp.
   4. Read the value.

      OK: 

      Temperature value: -40°C (-40°F) 

   5. Reconnect the ECM connector.

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 7: Identifying E4 ECM Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE ECM