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Check Engine Coolant Temperature Sensor

CHECK STEP FOR ENGINE COOLANT TEMPERATURE SENSOR

Step Check Yes No
1 CHECK ENGINE COOLANT TEMPERATURE SENSOR. 
Check the engine coolant temperature sensor. <Ref. to BASIC DIAGNOSTIC PROCEDURE .> or <Ref. to BASIC DIAGNOSTIC PROCEDURE .> or <Ref. to BASIC DIAGNOSTIC PROCEDURE .>		 Is the engine coolant temperature sensor OK? Go to step 2.  Replace the engine coolant temperature sensor.
2 CHECK HARNESS BETWEEN ENGINE COOLANT TEMPERATURE SENSOR AND COMBINATION METER. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from the engine coolant temperature sensor and combination meter.
  3. Measure the resistance between the engine coolant temperature sensor harness connector and combination meter harness connector.

    Connector & terminal 

    Except for STI model 

    (E8) No. 3 - (i12) No. 9: 

    STI model 

    (E8) No. 3 - (i12) No. 11: 

 Is the resistance less than 10 Ω? Except for STI model: Check the engine coolant temperature gauge. <Ref. to REMOVAL , Engine Coolant Temperature Gauge.> STI model: Replace the meter main assembly. Repair the wiring harness.
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