Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

If different DTCs related to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may be open.
Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, it is useful for determining whether the vehicle was running or stopped, the engine was warmed up or not, the air-fuel ratio was lean or rich, etc. at the time of the malfunction.

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 the ignition switch ON and push the hand-held tester or the OBD II scan tool main switch ON.

Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool.

Temperature: Same value as the actual intake air temperature.

Result:

RESULT REFERENCE

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 engine coolant temperature sensor connector.
2. Connect terminals 1 and 2 of the engine coolant temperature sensor connector on the wire harness side.
3. Turn the ignition switch ON.
4. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL /COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool.
  Temperature value: 140°C (284°F) or more
5. Reconnect the engine coolant temperature sensor connector.
Fig 1: Connecting Terminals 1 And 2 Of Engine Coolant Temperature Sensor Connector On Wire Harness Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Identifying Engine Coolant Temperature Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- OK : CONFIRM GOOD CONNECTION AT SENSOR. IF OK, REPLACE ENGINE COOLANT TEMP. SENSOR
- 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 engine coolant temperature sensor connector.
2. Connect the terminals THW and E2 of the E3 ECM connector.
  HINT:
  
  Before checking, do a visual and contact pressure check on the ECM connector.
  
  Fig 3: Connecting Terminals THW And E2 Of E3 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Turn the ignition switch ON.
4. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool.
  Temperature value: 140°C (284°F) or more
5. Reconnect the engine coolant temperature sensor connector.
Fig 4: Identifying Engine Coolant Temperature Sensor Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- OK : REPAIR OR REPLACE HARNESS OR CONNECTOR
- 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 engine coolant temperature sensor connector.
2. Turn the ignition switch ON.
3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool.
  Temperature value: -40°C (-40°F)
4. Reconnect the engine coolant temperature sensor connector.
Fig 5: Connecting Engine Coolant Temperature Sensor Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- OK : REPLACE ENGINE COOLANT TEMPERATURE SENSOR
- NG : GO to next step
READ VALUE OF HAND-HELD TESTER OR OBD II SCAN TOOL (CHECK FOR SHORT IN ECM)
1. Disconnect the E3 ECM connector.
2. Turn the ignition switch ON.
3. Select the item "DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / COOLANT TEMP" and read its value displayed on the hand-held tester or the OBD II scan tool.
  Temperature: -40°C (-40°F)
4. Reconnect the ECM connector.
Fig 6: Connecting ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 7: Identifying E3 ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
- OK : REPAIR OR REPLACE HARNESS OR CONNECTOR
- NG : REPLACE ECM (See REPLACEMENT )