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 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.

READ VALUE OF TECHSTREAM (ENGINE COOLANT TEMPERATURE)

Connect Techstream to the DLC3.
Turn the ignition switch to the ON position.
Turn the tester on.
On the tester, select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.

Read the value displayed on the tester.

Standard: Between 80°C and 97°C (176°F and 207°F) with warm engine.

Result

DTC RESULT DESCRIPTION CHART

Temperature Displayed	Proceed to
-40°C (-40°F)	A
140°C (284°F) or higher	B
Between 80°C and 97°C (176°F and 207°F)	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) or higher.

B: Go to step 4

C: CHECK FOR INTERMITTENT PROBLEMS

A: Go to Next Step

READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN WIRE HARNESS)
1. Confirm connector connecting condition.
2. Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector.
3. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.
4. Connect Techstream to the DLC3.
5. Turn the ignition switch to the ON position.
6. Turn the tester on.
7. On the tester, select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
8. Read the value displayed on the tester.
  Standard: 140°C (284°F) or higher
9. Reconnect the ECT sensor connector.
  
  Fig 1: Identifying ECT Sensor And ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to Next Step
READ VALUE OF TECHSTREAM (CHECK FOR OPEN IN ECM)
1. Disconnect the E2 ECT sensor connector.
2. Connect terminals THW and E2 of the E3 ECM connector.
  HINT:
  
  Before checking, do visual and contact pressure checks on the ECM connector.
3. Connect Techstream to the DLC3.
4. Turn the ignition switch to the ON position.
5. Turn the tester on.
6. On the tester, select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
7. Read the value displayed on the tester.
  Standard: 140°C (284°F) or higher
8. Reconnect the ECT sensor connector.
  
  Fig 2: Identifying ECT Sensor And ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: REPLACE ECM
READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E2 ECT sensor connector.
2. Connect Techstream to the DLC3.
3. Turn the ignition switch to the ON position.
4. Turn the tester on.
5. On the tester, select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
6. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
7. Reconnect the ECT sensor connector.
  
  Fig 3: Identifying Short In Wire Harness
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG: Go to Next Step
READ VALUE OF TECHSTREAM (CHECK FOR SHORT IN ECM)
1. Disconnect the E3 ECM connector.
2. Connect Techstream to the DLC3.
3. Turn the ignition switch to the ON position.
4. Turn the tester on.
5. On the tester, select the following menu items: Powertrain / Engine and ECT / Data List / Coolant Temp.
6. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
7. Reconnect the ECM connector.
  
  Fig 4: Identifying Short In ECM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: REPAIR OR REPLACE HARNESS OR CONNECTOR

NG: REPLACE ECM