Inspection Procedure

WARNING: This page is about a different variant/trim than selected.

HINT:

If DTCs that are related to different systems are output simultaneously while terminal E2 is used as a ground terminal, terminal E2 may have an open circuit.
Read freeze frame data using the hand-held tester or the OBDII scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (ENGINE COOLANT TEMPERATURE)

Connect the hand-held tester or the OBD II scan tool to the DLC3.
Turn ON the ignition switch. Push the hand-held tester or the OBD II scan tool main switch ON.

On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP. Read the values.

Temperature: Same value as the actual engine coolant temperature.

Result:

ECT TEMPERATURE DISPLAY

Temperature Displayed	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 hand-held tester or the OBD II scan tool indicates -40°C (-40°F).
If there is a short circuit, the hand-held tester or the OBD II scan tool indicates 140°C (284°F) or more.

B: Go to step 4
C: CHECK FOR INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )
A: GO TO NEXT STEP.

READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the E2 ECT sensor connector.
2. Connect terminals 1 and 2 of the E2 ECT sensor wire harness side connector.
3. Turn the ignition switch ON.
4. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP. Read the values.
  
  Fig 1: Connecting ECT Sensor Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Temperature value: 140°C (284°F) or more
1. OK: CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR
2. NG: GO TO NEXT STEP.
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR OPEN IN ECM)
1. Disconnect the E2 ECT sensor connector.
2. Connect terminals THW and E2 of the E7 ECM connector.
  HINT:
  
  Before checking, do a visual and contact pressure check for the ECM connector.
3. Turn the ignition switch ON.
4. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP. Read the values.
  
  Fig 2: Identifying ECM and ECT Sensor Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Temperature value: 140°C (284°F) or more
1. OK: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. NG: CONFIRM GOOD CONNECTION AT ECM. IF OK, REPLACE ECM (See REPLACEMENT )
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E2 ECT sensor connector.
2. Turn the ignition switch ON.
3. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP. Read the values.
  
  Fig 3: Disconnecting ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Temperature value: -40°C (-40°F)
1. OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR
2. NG: GO TO NEXT STEP.
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM)
1. Disconnect the E7 ECM connector.
2. Turn the ignition switch ON.
3. On the hand-held tester or the OBD II scan tool, enter the following menus: DIAGNOSIS/ENHANCED OBD II/DATA LIST/ALL/COOLANT TEMP. Read the values.
  
  Fig 4: Disconnecting ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  OK: Temperature value: -40°C (-40°F)
1. OK: REPAIR OR REPLACE HARNESS AND CONNECTOR
2. NG: REPLACE ECM (See REPLACEMENT )