P0182
DTC P0182, P0183, P0187, or P0188
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0182
- Fuel Temperature Sensor 1 Circuit Low
DTC P0183
- Fuel Temperature Sensor 1 Circuit High
DTC P0187
- Fuel Temperature Sensor 2 Circuit Low
DTC P0188
- Fuel Temperature Sensor 2 Circuit High
Diagnostic Fault Information
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 5 volt bias voltage cold and decreases as the sensor warms. The ECM monitors the fuel temperature sensor signal circuit in order to calculate the temperature of the fuel entering and leaving the engine fuel rail.
Conditions for Running the DTC
P0182 or P0187
* Engine speed is greater than 600 RPM.
* Engine has been running for greater than 10 seconds.
* DTCs P0182 and P0187 run continuously within the enabling conditions.
P0183 or P0188
* Engine speed is greater than 600 RPM.
* Engine has been running for greater than 10 seconds.
* DTCs P0183 and P0188 run continuously within the above enabling conditions.
Conditions for Setting the DTC
P0182 or P0187
The fuel temperature sensor is greater than 149°C (300°F) for 5 seconds.
P0183 or P0188
The fuel temperature sensor is less than -39°C (-38°F) for 5 seconds.
Action Taken When the DTC Sets
DTCs P0182, P0183, P0187 and P0188 are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P0182, P0183, P0187 and P0188 are Type B DTCs.
Diagnostic Aids
* Fuel Temperature Sensor 1 is located on the back side of the fuel injection pump.
* Fuel Temperature Sensor 2 also referred to as the Fuel Rail Temperature Sensor is located in the fuel return line near the quick-connect fittings.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Fuel System Description Fuel System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (Fuel Temperature Sensor)Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (ECT Sensors)Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 1)Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (IAT Sensor 2)Temperature Versus Resistance (EGT Sensors) Temperature Versus Resistance (EGT Sensors)Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (EGR Temperature Sensors)Temperature Versus Resistance (Emission Reduction Fluid Injector) [1][2]Diesel Emissions Fluid (DEF) System
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Observe the Fuel Temperature Sensor and Fuel Rail Temperature Sensor parameters with a scan tool. Both fuel temperature parameters should be within the operating range of -39 to 149°C (-38 to 300°F), depending on current ambient temperature and the vehicle operating conditions
• If not between -39 to 149°C (-38 to 300°F)
Refer to Circuit/System Testing
• If between -39 to 149°C (-38 to 300°F)
3. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
• If DTC resets
Refer to Circuit/System Testing
• If DTC does not reset
4. All OK.
Circuit/System Testing
DTC P0182 or P0183
1. Ignition OFF.
2. Disconnect the 12-way harness connector at the engine harness jumper. Refer to Inline Harness Connector End Views X100 connector X113.
Note: Testing for steps 2-3 are performed on the ECM side of the harness connector.
3. Ignition ON.
4. Test for 4.8-5.2 V between the signal circuit terminal 3 and ground.
• If less than 4.8 V
Test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
• If greater than 5.2 V
Test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
• If within 4.8 to 5.2 V
Note: If the fuse opens repair the short to voltage in the low reference circuit.
5. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 4.
6. Verify the scan tool Fuel Temperature Sensor parameter is greater than 120°C (248°F).
• If less than 120°C (248°F)
Test the low reference circuit for an open, high resistance or short to voltage. If the circuit tests normal, replace the K20 engine control module.
• If greater than 120°C (248°F)
Note: Testing for this step is performed on the engine side of the harness connector.
7. Disconnect the harness connector at the B48 fuel temperature sensor.
8. Test for poor connection at the B48 Fuel Temperature Sensor.
• If poor connection was found
Repair as necessary.
• If no poor connection was found
9. Test the Fuel Temperature Sensor signal circuit for an open, high resistance or short between the B48 Fuel Temperature Sensor terminal 1 and the 12-way harness connector at the engine harness jumper terminal 3.
• If an open, high resistance or short was found
Repair as necessary.
• If no open, high resistance or short was found
10. Test the Fuel Temperature Sensor low reference circuit for and open, high resistance or short between the B48 Fuel Temperature Sensor terminal 2 and the 12-way harness connector at the engine harness jumper terminal 4.
• If an open, high resistance or short was found
Repair as necessary.
• If no open, high resistance or short was found
11. Replace the B48 Fuel Temperature Sensor.
DTC P0187 or P0188
1. Ignition OFF.
2. Disconnect the harness connector at the B132 Fuel Rail Temperature Sensor.
3. Ignition ON.
4. Test for 4.8-5.2 V between the signal circuit terminal 1 and ground.
• If less than 4.8 V
Test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
• If greater than 5.2 V
Test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
• If within 4.8 to 5.2 V
Note: If the fuse opens repair the short to voltage in the low reference circuit.
5. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2.
6. Verify the scan tool Fuel Temperature Sensor parameter is greater than 120°C (248°F).
• If less than 120°C (248°F)
Test the low reference circuit for an open, high resistance or short to voltage. If the circuit tests normal, replace the K20 engine control module.
• If greater than 120°C (248°F)
7. Replace the B132 Fuel Rail Temperature Sensor.
Component Testing
Measure and record the resistance of the fuel temperature sensor at various temperatures and compare those measurements to the Temperature vs. Resistance table. Refer to Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (Fuel Temperature Sensor)Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (ECT Sensors)Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 1)Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (IAT Sensor 2)Temperature Versus Resistance (EGT Sensors) Temperature Versus Resistance (EGT Sensors)Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (EGR Temperature Sensors)Temperature Versus Resistance (Emission Reduction Fluid Injector) [1][2]Diesel Emissions Fluid (DEF) System.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Temperature Sensor Replacement (Fuel Return Rail) Fuel Temperature Sensor Replacement (Fuel Return Rail)Fuel Temperature Sensor Replacement (Injection Pump) Fuel Temperature Sensor Replacement (Injection Pump)
* Control Module References Control Module References for ECM replacement, programming, and setup.