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 the intelligent tester. Freeze frame data records the engine conditions when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, 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 INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE)

Connect the intelligent tester to the DLC3.
Turn the ignition switch ON and turn the tester ON.
Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / 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

RESULT 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, the intelligent tester indicates - 40°C (-40°F).
If there is a short circuit, the intelligent tester 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 INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector.
  
  Fig 1: Identifying ECT Sensor Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals 1 and 2 of the ECT sensor connector on the wire harness side.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
6. Read the value displayed on the tester.
  
  Fig 2: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard: 140°C (284°F) or higher.
OK : CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG : GO TO NEXT STEP
READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN ECM)
1. Disconnect the E2 ECT sensor connector.
  
  Fig 3: Disconnecting E2 ECT Sensor Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect terminals THW and E2 of the ECM connector.
  HINT:
  
  Before checking, perform visual and contact pressure checks on the ECM connector.
3. Connect the intelligent tester to the DLC3.
4. Turn the ignition switch ON and turn the tester ON.
5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
6. Read the value displayed on the tester.
  
  Fig 4: Identifying ECM Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard: 140°C (284°F) or higher.
OK : REPAIR OR REPLACE HARNESS OR CONNECTOR

NG : CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM
READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the E2 ECT sensor connector.
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch ON and turn the tester ON.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
5. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
  
  Fig 5: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK : REPLACE ENGINE COOLANT TEMPERATURE SENSOR

NG : GO TO NEXT STEP
READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN ECM)
1. Disconnect the E3 ECM connector.
  
  Fig 6: Disconnecting E3 ECM Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the intelligent tester to the DLC3.
3. Turn the ignition switch ON and turn the tester ON.
4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
5. Read the value displayed on the tester.
  Standard: -40°C (-40°F)
OK : REPAIR OR REPLACE HARNESS OR CONNECTOR

Fig 7: Identifying ECM Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG : REPLACE ECM