Inspection Procedure

READ DATA LIST (ENGINE COOLANT TEMPERATURE)

Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
Turn the engine switch on (IG) and turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP.
Read the values.
Standard:

Same value as the actual ECT.

Result

RESULT CHART

Engine Coolant Temperature	Proceed to
-40°C (-40°F)	A
140°C (284°F) or more	B
OK (same as present temperature)	C

HINT:

If there is an open circuit, the intelligent tester indicates -40°C (-40°F).

If there is a short circuit, the intelligent tester indicates 140°C (284°F) or more.

B: Go to step 4

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to next step

READ DATA LIST (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the E40 ECT sensor connector.
2. Connect terminals 1 and 2 of the ECT sensor wire harness side connector.
3. Turn the engine switch on (IG).
4. Read the value.
  Standard:
  
  140°C (284°F) or more
  
  Fig 1: Identifying E40 ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to next step
READ DATA LIST (CHECK FOR OPEN IN ECM)
1. Disconnect the E40 ECT sensor connector.
2. Connect terminals the E6 and E8 ECM connectors.
  HINT:
  
  Before checking, do a visual and contact pressure check for the ECM connector.
3. Turn the engine switch on (IG).
4. Read the value.
  Standard:
  
  140°C (284°F) or more
  
  Fig 2: Identifying E40 ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR
READ DATA LIST (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E40 ECT sensor connector.
2. Turn the engine switch on (IG).
3. Read the value.
  Standard:
  
  -40°C (-40°F)
  
  Fig 3: Identifying E40 ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to next step
READ DATA LIST (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E40 ECT sensor connector.
2. Disconnect the E6 and E8 ECM connectors.
3. Turn the engine switch on (IG).
4. Read the value.
  Standard:
  
  -40°C (-40°F)
  
  Fig 4: Identifying E6 And E8 ECM Connectors
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
NG: REPLACE ECM

OK: REPAIR OR REPLACE HARNESS AND CONNECTOR