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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
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC stored in memory
for the item monitored below)
Sensor (The sensor below is determined to be normal)
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.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function -
OBD-II Drive
Cycle -
Pattern 23 
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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.
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Required Special Tools:
- MB991958: Scan Tool (M.U.T.-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: USB Cable
- MB991910: Main Harness A
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STEP 1. Using scan tool MB991958, check data list item
53: Fuel Tank Temperature Sensor.
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| 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.
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(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.
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STEP 2. Check harness connector D-18 at the fuel tank temperature
sensor for damage.
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Q.
Is the harness connector in good condition?
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Go to Step 3.
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Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 6.
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STEP 3. Check the fuel tank temperature sensor.
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(1)Disconnect the fuel tank temperature sensor connector D-18.
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(2)Measure the resistance between terminal No. 1 and No. 3 of the fuel tank temperature sensor.
Standard value:
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 6.
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STEP 4. Check harness connector B-109 at ECM for damage.
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Q.
Is the harness connector in good condition?
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Go to Step 5.
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Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 6.
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STEP 5. Check for short circuit to ground between fuel tank temperature
sensor connector D-18 (terminal No. 3) and ECM connector B-109 (terminal No. 115).
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| note |
Check harness after checking intermediate connector C-39. If the intermediate connector
is damaged, repair or replace it. Refer to GROUP 00E, Harness Connector Inspection .
Then go to Step 6.
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Q.
Is the harness wire in good condition?
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Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP
42B, Diagnosis -
ID Code Registration Judgment Table <Vehicles with KOS> or
GROUP 42C, Diagnosis -
ID Codes Registration Judgment Table <Vehicles with WCM> .
Then go to Step 6.
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Repair it. Then go to Step 6.
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STEP 6. Test the OBD-II drive cycle.
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(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function -
OBD-II
Drive Cycle -
Pattern 23 .
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(2)Check the diagnostic trouble code (DTC).
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Retry the troubleshooting.
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The inspection is complete.
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