P0182

DTC P0182: Fuel Tank Temperature Sensor Circuit Low 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)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)

- Not applicable
Sensor (The sensor below is determined to be normal)

- Not applicable

DTC SET CONDITIONS

Logic Flow Chart






Check Condition

- 2 seconds or more have passed since the engine starting sequence was completed.
Judgement Criterion

- Sensor output voltage has continued to be 0.1 volt or lower for 2 seconds.

FAIL-SAFE AND BACKUP FUNCTION

- None

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 Monitors, Trips, Drive Cycles and Readiness Codes .

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

- Fuel tank temperature sensor failed.
- Shorted fuel tank temperature sensor circuit or connector damage.
- ECM failed.


DIAGNOSIS

Required Special Tools:

- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A

STEP 1. Using scan tool MB991958, check data list item 53: Fuel Tank Temperature Sensor.





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?

YES It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.

NO Go to Step 2.

STEP 2. Check harness connector D-22 at the fuel tank temperature sensor for damage.

Q. Is the harness connector in good condition?

YES Go to Step 3.
NO Repair or replace it. Harness Connector Inspection.
Then go to Step 6.
STEP 3. Check the fuel tank temperature sensor.

(1)Disconnect the fuel tank temperature sensor connector D-22.





(2)Measure the resistance between terminal No. 1 and No. 3 of the fuel tank temperature sensor.
Standard value:

0.5 - 12.0 kohms

Q. Is the measured resistance between 0.5 and 12.0 kohms?

YES Go to Step 4.

NO Replace the fuel tank temperature sensor. Then go to Step 6.

STEP 4. Check harness connector B-10 at ECM for damage.

Q. Is the harness connector in good condition?

YES Go to Step 5.
NO Repair or replace it. Harness Connector Inspection.
Then go to Step 6.
STEP 5. Check for short circuit to ground between fuel tank temperature sensor connector D-22 (terminal No. 3) and ECM connector B-10 (terminal No. 115).

NOTE:
Check harness after checking intermediate connector C-47. If the intermediate connector is damaged, repair or replace it. Harness Connector Inspection.
Then go to Step 6.

Q. Is the harness wire in good condition?

YES Replace the ECM (Refer to, Removal and Installation Removal and Replacement).
Then go to Step 6.
NO Repair it. Then go to Step 6.
STEP 6. Test the OBD-II drive cycle.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 Monitors, Trips, Drive Cycles and Readiness Codes.

(2)Check the diagnostic trouble code (DTC).

Q. Is DTC P0182 set?

YES Retry the troubleshooting.
NO The inspection is complete.