P0190-FUEL PRESS SENSOR SIGNAL VOLTAGE TOO HIGH

For a complete wiring diagram Refer to Section 8W

When Monitored:
With the ignition on.
Set Condition:
The Fuel Rail Pressure Sensor signal voltage is above 4.8 volts.

Possible Causes

ECM - FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

ECM - FUEL PRESSURE SENSOR SIGNAL OPEN

FUEL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

SENSOR GROUND CIRCUIT OPEN

FUEL PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

FUEL PRESSURE SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

FUEL PRESSURE SENSOR

ENGINE CONTROL MODULE

Diagnostic Test

1.CHECKING FOR CURRENT DTC

WARNING: THE FUEL INJECTION PUMP SUPPLIES HIGH-PRESSURE FUEL TO EACH INDIVIDUAL INJECTOR THROUGH HIGH-PRESSURE FUEL LINES. FUEL UNDER HIGH PRESSURE CAN PENETRATE SKIN AND CAUSE PERSONAL INJURY. WEAR SAFETY GOGGLES AND ADEQUATE PROTECTIVE CLOTHING.

NOTE: If DTC P0641, P0651 or P0697 is present with this DTC, diagnose DTCs P0641, P0651 or P0697 before diagnosing this DTC.

NOTE: If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the scan tool at the same time the DTC is displayed.

NOTE: Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC.

Did this DTC set again?

Yes

Go To2

Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

2.CHECK FUEL PRESSURE SENSOR SIGNAL CIRCUIT

Select the appropriate voltage reading.

Voltage is above 5.5 volts.

Go To3

Voltage is between 4.7 and 5.4 volts.

Go To4

Voltage is below 4.7 volts.

Go To9

3.FUEL PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

Is the voltage below 1.0 volt?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Fuel Pressure Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

4.FUEL PRESSURE SENSOR GROUND CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To5

Repair the Fuel Pressure Sensor Ground circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

5.FUEL PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Go To6

Repair the Fuel Pressure Sensor 5-volt Supply circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

6.FUEL PRESSURE SENSOR GROUND CKT SHORTED TO VOLTAGE

NOTE: If the Fuel Pressure Sensor Ground circuit had a short to voltage on it, the ECM could be damaged. Retest the Fuel Pressure Sensor circuit.

Is the voltage above 1.0 volt at either connector?

Yes

Repair the Fuel Pressure Sensor Ground circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To7

7.FUEL PRESSURE SENSOR

Is DTC P0190 FUEL PRESS SENSOR CIRCUIT MALF SIGNAL VOLTAGE TOO LOW present?

Yes

Replace the Fuel Pressure Sensor.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Go To8

8.ENGINE CONTROL MODULE

If there are no possible causes remaining, view repair.

Repair

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

9.FUEL PRESSURE SENSOR SIGNAL CIRCUIT OPEN

Is the resistance below 10.0 ohms?

Yes

Replace and program the Engine Control Module in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

Repair the Fuel Pressure Sensor Signal circuit for an open.
Perform the ECM Verification Test Ver. 1 (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).