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 Conditions

- 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.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 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.

- Connector damage.

- Harness 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 the harness connector D-20 at the fuel tank temperature sensor and harness connector B-11 at ECM for damage.

Q. Is the harness connector in good condition?

YES Go to Step 3.
NO Repair 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-20.





(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 for short circuit to ground between the fuel temperature sensor connector D-20 and the ECM connector B-11.

(1)Disconnect the fuel temperature sensor connector D-20 and the ECM connector B-11.





(2)Check for the continuity between the temperature sensor connector D-20 (terminal No. 3) and ground.

- Not continuity.

Q. Is the harness wire in good condition?

YES Go to Step 5.

NO Check harness connector C-129 at Intermediate connector for damage, and repair as required. Harness Connector Inspection.
If the Intermediate connector C-129 is good condition, repair harness wire between the temperature sensor connector D-20 (terminal No. 3) and the ECM connector B-11 (terminal No.115) because of open circuit. Then go to Step 6.

STEP 5. Check the trouble symptoms.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 22 Monitors, Trips, Drive Cycles and Readiness Codes.

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

Q. Is DTC P0182 set?

YES Replace the ECM. When the ECM is replaced, register the ID code. Refer to ID registration procedure manual - ID codes registration judgement table [Vehicles with KOS] or ID registration procedure manual - ID codes registration judgement table [Vehicles with WCM]. Then go to Step 6.
NO It can be assumed that this malfunction is intermittent. How to Cope With Intermittent Malfunctions.
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 22 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.