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 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.

1. READ VALUE OF INTELLIGENT TESTER (ENGINE COOLANT TEMPERATURE) 
   1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
   2. Turn the ignition switch ON and turn the intelligent tester ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
   4. 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 

2. READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the E2 Engine Coolant Temperature (ECT) sensor connector.
   2. Connect terminals 1 and 2 of the ECT sensor wire harness side connector.
   3. Turn the ignition switch ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
   5. Read the value.

      Standard: 140°C (284°F) or more 

   OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

   Fig 1: Checking ECT Sensor (Open In Wire Harness)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: GO TO Next Step 

3. READ VALUE OF INTELLIGENT TESTER (CHECK FOR OPEN IN ECM) 
   1. Disconnect the E2 ECT sensor connector.
   2. Connect terminals THW and E2 of the E5 ECM connector.

      HINT:

      Before checking, do a visual and contact pressure check for the ECM connector.

   3. Turn the ignition switch ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
   5. Read the value.

      Standard: 140°C (284°F) or more 

   NG: CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM 

   Fig 2: Checking ECT Sensor (Open In ECM)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

4. READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the E2 ECT sensor connector.
   2. Turn the ignition switch ON.
   3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
   4. Read the value.

      Standard: -40°C (-40°F) 

   OK: REPLACE ENGINE COOLANT TEMPERATURE SENSOR 

   Fig 3: Checking ECT Sensor (Short In Wire Harness)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: GO TO Next Step 

5. READ VALUE OF INTELLIGENT TESTER (CHECK FOR SHORT IN ECM) 
   1. Disconnect the E2 ECT sensor connector.
   2. Disconnect the E5 ECM connectors.
   3. Turn the ignition switch ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / COOLANT TEMP.
   5. Read the value.

      Standard: -40°C (-40°F) 

   NG: REPLACE ECM 

   Fig 4: Checking ECT Sensor For Short In ECM

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR