Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P0182: Fuel Temperature Sensor Circuit Low VoltageDTC P0183: Fuel Temperature Sensor Circuit High Voltage
Diagnostic Fault Information
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
|---|---|---|---|---|---|
Fuel Temperature Signal | P0182 | P0183² | P0183 | P0183 | -- |
Low Reference | -- | ² | P0183 | ¹ | -- |
¹ Opens fuse in 12-volt circuit ² Temperature is skewed and may not have any codes | |||||
Typical Scan Tool Data
Circuit | Short to Ground | High Resistance | Open | Short to Voltage |
|---|---|---|---|---|
Operating Conditions: The Ignition ON, with the Engine OFF Parameter Normal Range: -30 to +120°C (-22 to +248°F) | ||||
Fuel Temperature Signal | 120°C (248°F) | Varies¹ | -40°C (-40°F) | -40°C (-40°F) |
¹ Skewed sensor | ||||
Circuit/System Description
The fuel temperature sensor is a thermistor. The engine control module (ECM) supplies the fuel temperature sensor a bias voltage of 5 volts on the signal circuit and also provides a low reference circuit to the sensor. When the fuel temperature sensor is cold, the resistance is high. The fuel temperature sensor signal voltage remains near the bias voltage cold and decreases as the sensor warms. The control module monitors the fuel temperature sensor signal circuit in order to calculate the temperature of the fuel entering the engine.
Conditions for Running the DTC
P0182
| • | The ignition is ON. |
| • | DTC P0182 runs continuously within the enabling conditions. |
P0183
| • | The ignition is ON. |
| • | DTC P0183 runs continuously within the above enabling conditions. |
Conditions for Setting the DTC
P0182
The fuel temperature sensor is more than 120°C (248°F) for 2 seconds.
P0183
The fuel temperature sensor is less than -30°C (-22°F) for 2 seconds.
Action Taken When the DTC Sets
| • | The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. |
| • | The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records. |
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. |
| • | A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic. |
| • | Clear the MIL and the DTC with a scan tool. |
Diagnostic Aids
| • | A short to a separate 5-volt source may set a DTC P0183. |
| • | A skewed sensor could result in poor driveability concerns. |
Reference Information
Schematic Reference
Connector End View Reference
Engine Controls Connector End Views
Electrical Information Reference
Circuit/System Verification
Important: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
- Turn ON the ignition and observe the Fuel Temperature Sensor parameter with a scan tool. The fuel temperature parameter should be within the operating range.
- Engine running, observe the DTC information with a scan tool. DTCs P0182 or P0183 should not set.
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
P0182
- Turn OFF the ignition for 30 seconds or until the ECM powers down.
- Disconnect the fuel temperature sensor .
- Turn ON the ignition, with the engine OFF and observe the fuel temperature sensor parameter with a scan tool. Fuel temperature should go to -40°C (-40°F).
- If all circuits test normal, replace the fuel temperature sensor.
| ⇒ | If the fuel temperature is warmer than -40°C(-40°F) , test the signal circuit for a short to ground, a short to any low reference circuits. If the circuits test normal, replace the control module. |
P0183
- Turn ON the ignition, with the engine OFF and observe the fuel temperature sensor parameter with a scan tool.
- Disconnect the fuel temperature sensor connector.
- Using a DMM, measure the voltage between the fuel temperature signal circuit and a ground.
- Connect a 3A fused jumper between the signal circuit of the fuel temperature sensor and the low reference circuit.
- Observe the fuel temperature sensor parameter with a scan tool.
- With the ignition still turned ON , connect a DMM between the signal circuit and a ground.
- With the DMM set to the mA scale, measure the current.
- If all circuits test normal, replace the fuel temperature sensor.
| ⇒ | If the fuel temperature is colder than -30°C (-22°F), test the low reference circuit for an open. If the circuits test normal, replace the control module. |
Important: If a short to voltage is found, the fuel temperature sensor will also need to be replacement .
| ⇒ | If the voltage measures more than 5.2 volts, test the signal circuit for a short to voltage. If the circuits test normal, replace the control module. |
| ⇒ | If temperature is colder than 120°C (248°F), test the signal circuit for an open, high resistance or a faulty ECM. |
| ⇒ | If the current measures more than 15 mA , test the signal circuit for a short to a 5-volt reference circuit . If the circuits test normal, replace the control module. |
Component Testing
- Disconnect the fuel temperature sensor and measure the resistance of the sensor with a DMM.
- Record the values at varies engine temperatures and compare those results to the Temperature vs. Resistance Table (Fuel Temperature).
| ⇒ | If the sensor does not closely match through the temperature ranges, replace the fuel temperature sensor. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
