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11.6. Coolant Temperature Sensor Failure Failure codes: P0112, P0113
No. Operating steps Result Follow up steps 1 Put the ignition switch to “ON”.
Next step Yes Next step 2 Pull out joint of coolant temperature sensor on harness; use a multimeter to check if the magnitude of voltage between 1# (+) and 2# (-) pins of this joint is around 5V. No 4 Yes Replace ECU 3 Use a multimeter to check if the resistance value between 1# and 2# pins of the sensor is in proportion to its temperature (refer to relevant part in this service manual). No Replace the sensor Yes Repair or replace harness 4 Use a multimeter to check if it is break or short circuit between 17# and 29# pins of ECU and 2# and 1# pins of sensor joint. No Replace ECU Yes Next step 5 Start the engine, while engine coolant temperature rises, check if the voltages on two wires of the sensor falls as water temperature of the engine rises. No Replace the sensor Yes Check other part 6 Start the engine, disconnect the connector of water temperature sensor, and then observe if cooling fan of the engine starts up and runs at high speed. No Replace the ECU or the circuit
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