P0193-FUEL RAIL PRESSURE SENSOR HIGH

For a complete wiring diagram, refer to the Wiring Information.

When Monitored:
With the ignition on.
Set Condition:
The (K181) Fuel Rail Pressure Sensor Signal circuit voltage is above 4.75 Volts for 0.14 second.

Possible Causes
(K844) 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE
(K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
(K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT OPEN/HIGH RESISTANCE
(K359) FUEL RAIL PRESSURE SENSOR GROUND CIRCUIT OPEN/HIGH RESISTANCE
FUEL RAIL PRESSURE 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. DTC IS ACTIVE

NOTE: If any Sensor Reference DTCs are present, perform those diagnostic procedures before continuing with this test.

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

Perform the INTERMITTENT DTC diagnostic procedure. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

2. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE

1.	Turn the ignition off.

2.	Disconnect the Fuel Rail Pressure Sensor harness connector.

3.	Turn the ignition on.

4.	Measure the voltage of the (K181) Fuel Rail Pressure Sensor Signal circuit in the Fuel Rail Pressure Sensor harness connector.

Does the voltage measure above 5.2 Volts?

Yes

Repair the (K181) Fuel Rail Pressure 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).

Go To 3

3. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE

1.	Turn the ignition off.

2.	Disconnect the PCM C1 harness connector.

3.	Measure the resistance of the (K181) Fuel Rail Pressure Sensor Signal circuit between the Fuel Rail Pressure Sensor harness connector and the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Go To 4

Repair the (K181) Fuel Rail Pressure 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 (K359) FUEL PRESSURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE

1.	Measure the resistance of the (K359) Fuel Rail Pressure Sensor Ground circuit between the Fuel Rail Pressure Sensor harness connector and the PCM C1 harness connector.

Is the resistance below 5.0 Ohms?

Yes

Go To 5

Repair the (K359) Fuel Rail Pressure 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 PRESSURE SENSOR

1.	Reconnect the Fuel Rail Pressure Sensor harness connector.

2.	Reconnect the PCM C1 harness connector.

3.	Turn the ignition on.

4.	With the scan tool, clear DTCs.

5.	Turn the ignition off.

6.	Disconnect the Fuel Rail Pressure Sensor harness connector.

7.	Connect a jumper wire between the (K359) Fuel Rail Pressure Sensor Ground circuit and the (K181) Fuel Rail Pressure Sensor Signal circuit at the Fuel Rail Pressure Sensor harness connector.

8.	Turn the ignition on.

9.	With the scan tool, select View DTCs.

NOTE: The scan tool should display a Fuel Rail Pressure 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 Rail Pressure Sensor in accordance with the service information.

NOTE: The Fuel Rail Pressure Sensor is not serviceable separate from the Fuel Rail Assembly.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

Go To 6

6. POWERTRAIN CONTROL MODULE

1.	Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Fuel Rail Pressure 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).

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).

P0193-FUEL RAIL PRESSURE SENSOR HIGH

Possible Causes