Exhaust Heat Recirculation System Circuit: Procedure

1. Disconnect the engine coolant temperature sensor (for exhaust heat recirculation system) connector.
   Fig 1: Identifying H19 And F2 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance (Check for Open)

   Tester Connection	Condition	Specified Condition
   F2-2 (TWS3) - H19-26 (TWS3)	Always	Below 1 Ω
   F2-1 (E2) - H19-34 (E2)	Always	Below 1 Ω

   Standard Resistance (Check for Short)

   Tester Connection	Condition	Specified Condition
   F2-2 (TWS3) or H19-26 (TWS3) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Combination Meter Assembly)
   *b	Front view of wire harness connector (to Engine Coolant Temperature Sensor)

4. Reconnect the combination meter assembly connector.
5. Reconnect the engine coolant temperature sensor (for exhaust heat recirculation system) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE COOLANT TEMPERATURE SENSOR - COMBINATION METER) 

OK: Go to next step 

1. Inspect the engine coolant temperature sensor (for exhaust heat recirculation system). Refer to INSPECTION [08/2012 - ] .

NG → See step   3 

OK → See step   4