MALFUNCTION OF FUEL TEMPERATURE SENSOR [LO]
(DTC CODE P0187 / DIAGNOSIS MONITOR CODE 14)

1. Set the starter key to the "LOCK" position and disconnect the fuel temperature sensor connector.
2. Measure resistance between the 1st and 2nd terminals of the fuel temperature sensor connector (component side).

   
   

   Standard value

   Fuel temperature in measurement (ºC {ºF})	Resistance
   -20 {-4}	13.84-16.33 kΩ
   20 {68}	2.32-2.59 kΩ
   80 {176}	0.310-0.326 kΩ
   110 {230}	0.1399-0.1435 kΩ

    

NO Fault in fuel temperature sensor	YES Proceed to [2] Measuring voltage between sensor terminals

1. Turn the starter key "ON" and measure voltage between the 1st and 2nd terminals of the fuel temperature sensor connector (vehicle harness side).

   

   Standard value: 4.5-5.5 V

NO Go to [3] Measuring resistance between terminals.	YES Proceed to [3] Measuring resistance between terminals

1. Set the starter key to the "LOCK" position and connect the signal check harness.
2. Disconnect the signal check harness connectors from the ECU.
3. Turn the starter key "ON" and measure resistance between the terminals E48 and E50.
   

    

   
   

   Standard value

   Fuel temperature in measurement (ºC {ºF})	Resistance
   -20 {-4}	13.84-16.33 kΩ
   20 {68}	2.32-2.59 kΩ
   80 {176}	0.310-0.326 kΩ
   110 {230}	0.1399-0.1435 kΩ

NO Fault in fuel temperature sensor or faulty harness	YES Proceed to [4] Measuring voltage between terminals

1. Set the starter key to the "LOCK" position and connect the signal check harness connectors to the ECU.
2. Disconnect the signal check harness connectors from the vehicle harness.
3. Turn the starter key "ON" and measure voltage between the terminals E48 and E50.
   

   

   Standard value: 4.5-5.5 V

NO Fault in engine ECU and/or ECU connectors	YES Disconnection of the harness

1. Confirm the DTC P0187 is inactive

   • Start the engine and let it idling condition.
   • Verify the DTC P0187 is inactive.

   

2. DTC Clear

   • Clear the DTC with Hino DX
   • Confirm the same DTC is not reoccurred

   

P0187 is reoccur: Return to first process Other DTC appear: Refer to concerned Trouble shooting

Complete