GM Service Manual Online
For 1990-2009 cars only

DTC P0182 Without RPO CTF

Circuit Description

The fuel temperature sensor (FTS) is a thermistor. The engine control module (ECM) supplies the FTS a reference voltage of 5 volts on the signal circuit and also provides a low reference circuit to the sensor. When the FTS is cold, the resistance is high. The FTS signal voltage remains near the supplied voltage cold and decreases the signal voltage as the sensor warms. The control module monitors the FTS signal circuit in order to calculate the temperature of the fuel entering the engine. If the ECM detects an excessively low FTS signal voltage, a high temperature indication, this DTC will set.

Conditions for Running the DTC

    • The ignition is ON.
    •  The FTS is continuously monitored by the ECM .

Conditions for Setting the DTC

The FTS temperature is more than 130°C (266°F) for 1 second.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

Conditions for Clearing the MIL/DTC

    • The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
    • A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
    • Clear the MIL and the DTC with a scan tool.

Diagnostic Aids

    • Before starting a cold engine, the fuel temperature should be within a few degrees of the manifold air temperature (MAT) sensor.
    • Use the Temperature vs. Resistance table in order to test the fuel temperature sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor could result in poor driveability concerns.
    • If the condition is suspected of being an intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. If DTC P0182 can only be repeated by duplicating the Failure Records, refer to Temperature vs Resistance. The table may be used to test the FTS at various temperatures in order to evaluate the possibility of a shifted sensor that may be shorted above or below a certain temperature. If this is the case, replace the FTS. If the FTS appears to be OK, the malfunction is intermittent: refer to Diagnostic Aids.

  2. When testing FTS signal circuit for a short to ground, you may need to inspect for continuity between all other PCM circuits.

DTC P0182- Fuel Temperature Sensor Circuit Low Voltage

Step

Action

Values

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

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Go to Step 2

Go to Diagnostic System Check - Engine Controls

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Observe the fuel temperature sensor display.

Does the scan tool indicate that the fuel temperature sensor is greater than the specified value?

130°C (266°F)

Go to Step 4

Go to Step 3

3

  1. Observe the Freeze Frame/Failure Records data for this DTC.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text or as close to the Freeze Frame/Failure Records data that you observed.

Does the DTC reset?

--

Go to Step 4

Go to Diagnostic Aids

4

  1. Remove the air cleaner outlet duct from the air intake pipe.
  2. Disconnect the FTS.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the fuel temperature sensor parameter.

Does the scan tool indicate that the fuel temperature sensor is less than the specified value?

-30°C (-86°F)

Go to Step 6

Go to Step 5

5

  1. Turn OFF the ignition.
  2. Disconnect the PCM.
  3. Test the signal circuit of the FTS for a short to ground or a short to any low reference circuit. Refer to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 8

Go to Step 7

6

Replace the FTS. Refer to Fuel Temperature Sensor Replacement .

Did you complete the replacement?

--

Go to Step 8

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7

Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data .

Did you complete the replacement?

--

Go to Step 8

--

8

  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

--

Go to Step 9

Go to Step 2

9

With a scan tool observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK