P0192-FUEL RAIL PRESSURE SENSOR LOW

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 below 0.25 Volt for 0.14 second.

Possible Causes
(K844) 5-VOLT SUPPLY CIRCUIT OPEN/HIGH RESISTANCE
(K844) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
(K844) 5-VOLT SUPPLY CIRCUIT SHORTED TO THE (K359) FUEL RAIL PRESSURE SENSOR GROUND
(K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
(K181) FUEL RAIL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K359) FUEL PRESSURE SENSOR GROUND
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 (K844) 5-VOLT SUPPLY CIRCUIT 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 (K844) 5-Volt Supply circuit at the Fuel Rail Pressure Sensor harness connector.

Is the voltage above 4.8 Volts?

Yes

Go To 3

Repair the (K844) 5-Volt Supply circuit for an open circuit or a short to ground condition.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

3. FUEL PRESSURE SENSOR

1.	Reconnect the Fuel Rail Pressure Sensor harness connector.

2.	Turn the ignition on.

3.	With the scan tool, Erase DTCs.

4.	Turn the ignition off.

5.	Disconnect the Fuel Rail Pressure Sensor harness connector.

6.	Turn the ignition on.

7.	With the scan tool, select View DTCs.

NOTE: The scan tool should display a P0193-Fuel Rail Pressure Sensor High DTC with the connector unplugged.

Does the scan tool display the DTC as described above?

Yes

Replace the Fuel Rail Assembly 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 4

4. CHECK THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND

1.	Turn the ignition off.

2.	Disconnect the PCM C1 harness connector.

3.	Measure the resistance between ground and the (K181) Fuel Rail Pressure Sensor Signal circuit at the Fuel Rail Pressure Sensor harness connector.

Is the resistance above 10k Ohms?

Yes

Go To 5

Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to ground.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

5. CHECK FOR THE (K181) FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (K359) FUEL PRESSURE SENSOR GROUND CIRCUIT

1.	Measure the resistance between the (K181) Fuel Rail Pressure Sensor Signal circuit and the (K359) Fuel Rail Pressure Sensor Ground circuit at the Fuel Rail Pressure Sensor harness connector.

Is the resistance above 10k Ohms?

Yes

Go To 6

Repair the (K181) Fuel Rail Pressure Sensor Signal circuit for a short to the (K359) Fuel Rail Pressure Sensor Ground circuit.
Perform the PCM VERIFICATION TEST. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure).

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).

P0192-FUEL RAIL PRESSURE SENSOR LOW

Possible Causes