DTC P0183: Fuel Tank Temperature Sensor Circuit High Input

CIRCUIT OPERATION

• 5-volt voltage is applied to the fuel tank temperature sensor output terminal (terminal No. 3) from the ECM (terminal No. 115) via the resistor in the ECM.
  
• The fuel tank temperature sensor output voltage increases when the resistance increases and decreases when the resistance decreases. The ground terminal (terminal No. 1) is grounded to the vehicle body.
  

TECHNICAL DESCRIPTION

• The fuel tank temperature sensor converts the fuel tank temperature to a voltage.
  
• The ECM detects the fuel tank temperature with this output voltage.
  

DESCRIPTIONS OF MONITOR METHODS

Fuel tank temperature sensor output voltage is out of specified range.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

• Not applicable
  

• Not applicable
  

DTC SET CONDITIONS

• More than 2 seconds have passed since the engine starting sequence was completed.
  

• Fuel tank temperature sensor output voltage is more than 4.6 volts for 2 seconds.
  

FAIL-SAFE AND BACKUP FUNCTION

• None
  

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• Fuel tank temperature sensor failed.
  
• Open fuel tank temperature sensor circuit, harness damage, or connector damage.
  
• ECM failed.
  

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. (1)Connect scan tool MB991958 to the data link connector. (2)Turn the ignition switch to the "ON" position. (3)Set scan tool MB991958 to the data reading mode for item 53, Fuel Tank Temperature Sensor. Approximately the same as the ambient air temperature when the engine is cooled. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is the sensor operating properly? It can be assumed that this malfunction is intermittent. 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.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

(2)Measure the resistance between terminal No. 1 and No. 3 of the fuel tank temperature sensor. Standard value: 0.5 - 12.0 kΩ Q. Is the measured resistance between 0.5 and 12.0 kΩ? Go to Step 4. Replace the fuel tank temperature sensor. Then go to Step 10.

(3)Measure the voltage between terminal No. 3 and ground. Voltage should be between 4.5 and 4.9 volts. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is the measured voltage between 4.5 and 4.9 volts? Go to Step 7. Go to Step 5.

	Go to Step 6.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

(1)Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors. (2)Disconnect the fuel tank temperature sensor connector D-18. (3)Turn the ignition switch to the "ON" position.

(4)Measure the voltage between terminal No. 115 and ground. Voltage should be between 4.5 and 4.9 volts. (5)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is the measured voltage between 4.5 and 4.9 volts? Check harness connector C-39 at intermediate connector for damage, and repair or replace as required. Refer to GROUP 00E, Harness Connector Inspection . If intermediate connector is in good condition, repair harness wire between fuel tank temperature sensor connector D-18 (terminal No. 3) and ECM connector B-109 (terminal No. 115) because of open circuit. Then go to Step 10. Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 10.

(2)Check for the continuity between terminal No. 1 and ground. Continuity (2 ohms or less) Q. Does continuity exist? Go to Step 8. Repair harness wire between fuel tank temperature sensor connector D-18 (terminal No. 1) and ground because of open circuit or harness damage. Then go to Step 10.

	Go to Step 9.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

note Check harness after checking intermediate connector C-39. If intermediate connector is damaged, repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 10.

	Repair it. Then go to Step 10.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

	Retry the troubleshooting.

	The inspection is complete.