P0183-FUEL TEMPERATURE SENSOR CIRCUIT HIGH
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For a complete wiring diagram, refer to the Wiring Information.
Theory of Operation
The Fuel Temperature Sensor is combined with the Fuel Heater and located on the Fuel Filter/water separator housing which is mounted on the left frame rail next to the Transmission. The Fuel Temperature Sensor operates as a typical two wire sensor. It receives a 5-Volt signal on the (K156) Fuel Temperature Sensor Signal circuit and uses the (K914) Sensor Ground circuit.
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When Monitored:
With the ignition on.
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Set Condition:
The (K156) Fuel Temperature Sensor Signal circuit voltage is above 4.93 volts for 0.5 second.
Possible Causes |
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| (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN/HIGH RESISTANCE |
| (K914) FUEL TEMPERATURE SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE |
| FUEL TEMPERATURE SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
| 1. | Ignition on, engine not running. |
| 2. | With the scan tool, select View DTCs. |
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
2. CHECK THE (K156) FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
| 1. | Turn the ignition off. |
| 2. | Disconnect the Fuel Temperature Sensor harness connector. |
| 3. | Turn the ignition on. |
| 4. | Measure the voltage of the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector. |
Does the voltage measure above 5.2 volts?
Yes
- Repair the (K156) Fuel Temperature Sensor Signal circuit for a short to voltage.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Go To 3
3. CHECK THE (K156) FUEL TEMPERATURE SENSOR SIGNAL FOR AN OPEN/HIGH RESISTANCE
| 1. | Turn the ignition off. |
| 2. | Disconnect the PCM C1 harness connector. |
| 3. | Measure the resistance of the (K156) Fuel Temperature Sensor Signal circuit between the Fuel Temperature Sensor harness connector and the PCM C1 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 4
No
- Repair the (K156) Fuel Temperature Sensor Signal circuit for an open or high resistance.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
4. CHECK THE (K914) FUEL TEMPERATURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
| 1. | Measure the resistance of the (K914) Fuel Temperature Sensor Ground circuit between the Fuel Temperature Sensor harness connector and the PCM C1 harness connector. |
Is the resistance below 5.0 Ohms?
Yes
- Go To 5
No
- Repair the (K914) Fuel Temperature Sensor Ground circuit for an open or high resistance.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
5. CHECK THE FUEL TEMPERATURE SENSOR
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| 1. | Turn the ignition off. |
| 2. | Reconnect the Fuel Temperature Sensor harness connector. |
| 3. | Reconnect the PCM C1 harness connector. |
| 4. | Turn the ignition on. |
| 5. | With the scan tool, clear DTCs. |
| 6. | Turn the ignition off. |
| 7. | Disconnect the Fuel Temperature Sensor harness connector. |
| 8. | Connect a jumper wire between the (K914) Fuel Temperature Sensor Ground circuit and the (K156) Fuel Temperature Sensor Signal circuit in the Fuel Temperature Sensor harness connector. |
| 9. | Turn the ignition on. |
| 10. | With the scan tool, select View DTCs. |
| NOTE: | The scan tool should display a P0182-Fuel Temperature Sensor Low DTC as active with the jumper wire in place. |
Does the scan tool display the DTC as described above?
Yes
- Replace the Fuel Temperature Sensor in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
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Go To 6
| 1. | Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Temperature Sensor and the Powertrain Control Module (PCM). |
| 2. | Look for any chafed, pierced, pinched, or partially broken wires. |
| 3. | Look for broken, bent, pushed out or corroded terminals. |
| 4. | Perform any Technical Service Bulletins that may apply. |
Were any problems found?
Yes
- Repair as necessary.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).
No
- Replace the Powertrain Control Module in accordance with the service information.
- Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).