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DTC P0190, P0191, P0192, or P0193 — LNP or LNQ

The fuel rail pressure sensor measures the fuel pressure within the fuel rail. The engine control module (ECM) monitors the voltage on the fuel rail pressure sensor circuits. When the fuel pressure is low, the signal voltage is low. When the fuel pressure is high, the signal voltage is high. The ECM supplies 5 V to the 5 V reference circuit and a ground to the low reference circuit. The fuel rail pressure sensor provides a signal voltage to the ECM, relative to the pressure changes within the fuel rail, on the fuel rail pressure sensor signal circuit.

P0190 00 or P0191 00

The ECM detects that the fuel pressure sensor signal is not plausible.

P0192 00

The ECM detects that the fuel pressure sensor voltage is less than 0.254 V for 0.5 s.

P0193 00

The ECM detects that the fuel pressure sensor voltage is greater than 4.7 V for 0.5 s.

DTCs P0190 00, P0191 00, P0192 00, and P0193 00 are Type B DTCs.

DTCs P0190 00, P0191 00, P0192 00, and P0193 00 are Type B DTCs.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition On, observe the DTC information with a scan tool. Verify that DTC P0651 00 is not set.

⇒	If the DTC is set, refer to DTC P0651 : LNP or LNQ for further diagnosis.

2. Observe the scan tool Fuel Rail Pressure Sensor voltage parameter. The reading should be between 0.4-4.5 V.
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.

1. Ignition OFF, disconnect the harness connector at the B47B Fuel Rail Pressure Sensor.
2. Test for less than 5 Ω between the low reference circuit terminal 1 and ground.

⇒	If not the specified range, test the low reference circuit for an open/high resistance or a short to voltage.

3. Disconnect the harness connector X1 from the K20 Engine Control Module.
4. Test for less than 5 Ω between the signal circuit terminal 2 and K20 Engine Control Module terminal 35

⇒	If greater than the specified range, test the signal circuit for an open/high resistance.

5. Ignition ON, test for less than 0.3 V between the signal circuit terminal 2 and K20 Engine Control Module terminal 35

⇒	If greater than the specified range, test the signal circuit for an short to voltage.

6. Connect the harness connector X1 at the K20 Engine Control Module.
7. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 3 and ground.

⇒	If less than the specified range, test the 5 V reference 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 the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

8. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.8 V.

⇒	If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

9. Install a 3A fused jumper wire between the signal circuit terminal 2 and the low reference circuit terminal 1. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.3 V.

⇒	If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

10. If all circuits test normal, test or replace the B47B Fuel Rail Pressure Sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.