Code No. P0182: Fuel Temperature Sensor Circuit Low input

OPERATION

• A power voltage of 5 V is applied to the fuel temperature sensor output terminal from the engine-ECU connector terminal FTS.
  
• The power voltage is earthed to the engine-ECU connector terminal FTSE from the fuel temperature sensor connector terminal.
  

FUNCTION

• The fuel temperature sensor converts the fuel temperature into a voltage and inputs the voltage signal to the engine-ECU.
  
• In response to the signal, the engine-ECU corrects the fuel injection amount, etc.
  
• The fuel temperature sensor is a kind of resistor, which has characteristics to reduce its resistance as the fuel temperature rises. Therefore, the sensor output voltage varies with the fuel temperature, and becomes lower as the fuel temperature rises.
  

TROUBLE JUDGEMENT

• Battery positive voltage is 8 - 16 V
  
• 2 seconds later after the ignition switch has been in "ON" position or the engine has started up.
  

• The fuel temperature sensor output voltage is 0.10 V or less.
  

FAIL-SAFE AND BACKUP FUNCTION

• The fuel temperature is controlled to be 45°C (start-up of -25°C)
  

PROBABLE CAUSES

• Failed fuel temperature sensor
  
• Short circuit in fuel temperature sensor circuit or loose connector contact
  
• Failed engine-ECU
  

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Go to Step 2.

	Go to Step 3.

	Replace the fuel temperature sensor.

	Go to Step 4.

	Repair the connector(s) or wiring harness.

	Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions).

	Replace the engine-ECU.