P0182
DTC P0182 FUEL TEMP SENSOR A CIRCUIT LOW INPUTComponent Location:
COMPONENT LOCATION
GENERAL DESCRIPTION
The fuel temperature sensor is located in the fuel tank for detecting the fuel tank temperature.
The fuel temperature sensor uses a thermistor whose resistance changes with the temperature.
The electrical resistance of the fuel temperature sensor decreases as the temperature increases, and increases as the temperature decreases.
The reference 5 V in the PCM is supplied to the fuel temperature sensor via a resistor in the PCM. The resistor in the PCM and the thermistor in the fuel temperature sensor are connected in series. When the resistance value of the thermistor in fuel temperature sensor changes with variations in fuel tank temperature, the output voltage also changes.
DTC DESCRIPTION
If fuel temperature sensor's signal is less than 0.1 V after starting, the PCM determines that a fault exists and a DTC is stored.
DTC Detecting Condition:
Specification:
Schematic Diagram:
TERMINAL & CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?
YES: Repair as necessary and go to "Verification of Vehicle Repair" procedure.
NO: Go to "Signal Circuit Inspection" procedure.
SIGNAL CIRCUIT INSPECTION
1. Check Voltage
1. Ignition "OFF"
2. Disconnect FLS sensor connector.
3. Ignition "ON" & Engine "OFF"
4. Measure voltage between terminal 1 of FLS harness connector and chassis ground.
Specification: Approx. 5 V
5. Is the measured voltage within specifications?
YES: Go to "Component Inspection" procedure.
NO: Go to "Check for short to ground in harness" as below.
2. Check for short to ground in harness
1. Ignition "OFF"
2. Disconnect FLS sensor connector.
3. Measure resistance between terminal 1 and chassis ground.
Specification: Infinite
4. Is the measured resistance within specifications?
YES: Go to "Component Inspection" procedure.
NO:
- Check for short to ground in harness.
- Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.
COMPONENT INSPECTION
1. Ignition "OFF"
2. Disconnect Fuel Tank Unit connector.
3. Measure resistance between terminal 1 and 2 of the Fuel Temperature Sensor connector (To Component Side).
Specification
At 0 °C (32 °F), Resistance 4 - 7 kOhms
At 20 °C (68 °F), Resistance 2 - 3 kOhms
At 40 °C (104 °F), Resistance 0.9 - 1.3 kOhms
At 80 °C (176 °F), Resistance 0.2 - 0.4 kOhms
4. Is the measured resistance of FTS within specifications?
YES: Substitute with a known - good PCM and check for proper operation.
If the problem is corrected, replace PCM and go to "Verification of Vehicle Repair" procedure.
NO: Substitute with a known - good FTS and check for proper operation.
If the problem is corrected, replace FTS and go to "Verification of Vehicle Repair" procedure.
VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Monitor and record the Freeze Frame Data for the Diagnostic Trouble Code(DTC) which has been diagnosed.
2. Using a Scantool, Clear the DTCs.
3. Operate the vehicle within conditions noted in the freeze frame data or enable conditions.
4. Monitor that all readiness tests have been verified as "Complete"
5. Are any DTCs present?
YES: Go to the applicable troubleshooting procedure.
NO: System is performing to specification at this time.