ECD SYSTEM(for Swirl Control Valve), Diagnostic DTC:P0182 and P0183

DTC Code	DTC Name
P0182	Fuel Temperature Sensor "A" Circuit Low
P0183	Fuel Temperature Sensor "A" Circuit High

DESCRIPTION

The fuel temperature sensor monitors the fuel temperature. The fuel temperature sensor has a thermistor that varies its resistance depending on the fuel temperature. When the fuel temperature is low, the resistance of the thermistor is high. When the temperature is high, the resistance is low.

The variations of resistance are communicated to the ECM as changes of voltage.

The fuel temperature sensor is connected to the ECM. The 5 V power source voltage in the ECM is applied to the fuel temperature sensor from terminal THF via resistor R.

Resistor R and the fuel temperature sensor are connected in series. When the resistance value of the fuel temperature sensor changes due to a change of fuel temperature, the voltage at terminal THF also changes. Based on this signal, the ECM corrects the pressure control compensation of the fuel supply pump assembly and determines if there are errors.

Tip:

When the fuel temperature sensor output is outside the normal range, the ECM determines that this is a malfunction.


DTC No.	DTC Detection Condition	Trouble Area
P0182	Fuel temperature sensor output voltage is 0.15 V or less for 0.6 seconds (3 trip detection logic)	Open or short in fuel temperature sensor circuit Fuel temperature sensor ECM


DTC No.	DTC Detection Condition	Trouble Area
P0183	Fuel temperature sensor output voltage is 4.96 V or more for 0.6 seconds (3 trip detection logic)	Open or short in fuel temperature sensor circuit Fuel temperature sensor ECM

Table 1. Related Data List
DTC No.	Data List
P0182 P0183	Fuel Temperature

WIRING DIAGRAM

CAUTION / NOTICE / HINT

Note:

When replacing the ECM, the ECM needs Registration and Initialization (Click here).

Tip:

When the ECM must be replaced, before replacing the ECM, perform the "Learning Values Save" function using the GTS. Then after installing the new ECM, perform all of the initialization/registrations for the "Learning Values Write" function by following the instructions shown on the GTS display.
Read freeze frame data using the GTS. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

READ VALUE USING GTS (FUEL TEMPERATURE)

Connect the GTS to the DLC3.
Turn the ignition switch to ON and turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.

Read the value.

Same as actual fuel temperature.

Table 2. Result
Result	Proceed to
-40°C (-40°F)	A
120°C (248°F) or higher	B
Same as actual fuel temperature	C

Tip:

If there is an open circuit, the GTS indicates -40°C (-40°F).
If there is a short circuit, the GTS indicates 120°C (248°F) or higher.

READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)Click here

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here

READ VALUE USING GTS (CHECK FOR OPEN IN WIRE HARNESS)
1. Disconnect the fuel temperature sensor connector.
2. Connect terminals C95-1 (THF) and C95-2 (E2) of the fuel temperature sensor wire harness side connector.
3. Connect the GTS to the DLC3.
4. Turn the ignition switch to ON and turn the GTS on.
5. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.
6. Read the value.
  
  Standard value
  
  120°C (248°F) or higher
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE FUEL TEMPERATURE SENSORClick here

CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)

Disconnect the fuel temperature sensor connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
C95-1 (THF) - C112-93 (THF)	Always	Below 1 Ω
C95-2 (E2) - C112-124 (ETHF)	Always	Below 1 Ω

CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECMClick here

REPAIR OR REPLACE HARNESS OR CONNECTORClick here

READ VALUE USING GTS (CHECK FOR SHORT IN WIRE HARNESS)
1. Disconnect the fuel temperature sensor connector.
2. Connect the GTS to the DLC3.
3. Turn the ignition switch to ON and turn the GTS on.
4. Enter the following menus: Powertrain / Engine and ECT / Data List / Fuel Temperature.
5. Read the value.
  
  Standard value
  
  -40°C (-40°F)
REPLACE FUEL TEMPERATURE SENSORClick here

CHECK HARNESS AND CONNECTOR (FUEL TEMPERATURE SENSOR - ECM)

Disconnect the fuel temperature sensor connector.
Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance


Tester Connection	Condition	Specified Condition
C95-1 (THF) or C112-93 (THF) - Body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTORClick here

REPLACE ECM
1. Replace the ECM (Click here).
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here
CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE FUEL TEMPERATURE SENSOR
1. Replace the fuel temperature sensor (Click here).
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here
REPAIR OR REPLACE HARNESS OR CONNECTOR
1. Repair or replace the harness or connector.
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here
CONFIRM GOOD CONNECTION TO ECM. IF OK, REPLACE ECM
1. Replace the ECM (Click here).
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIREDClick here
REPLACE FUEL TEMPERATURE SENSOR
1. Replace the fuel temperature sensor (Click here).
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
1. Connect the GTS to the DLC3.
2. Turn the ignition switch to ON and turn the GTS on.
3. Clear the DTCs (Click here).
4. Turn the ignition switch off and wait for 60 seconds or more [A].
5. Perform road test [B].
6. Repeat [A] and [B] for the number of trips detected.
7. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
8. Confirm that the DTC is not output again.
END