DTC P0192 or P0193 (LF1, LFW)

/ 9-4x / 2011 / 2. Engine / Engine management and fuel system, V6 / Fault diagnosis, diagnostic trouble codes / DTC P0192 or P0193 (LF1, LFW)

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P0192

Fuel Rail Pressure Sensor Circuit Low Voltage

DTC P0193

Fuel Rail Pressure Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
5 V Reference Voltage	P0192, P0193, P0340, P0345, P0365, P0390, P0506, P0641, P2227, P2229	P0192	P0193, P0641, P2227, P2229	P0191
Fuel Rail Pressure Sensor Signal	P0192	P0192, P0193	P0193	P0191
Low Reference	-	P0193	P0193	P0191

Circuit/System Description

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

Conditions for Running the DTC

•	Engine is running.

•	The ignition voltage is between 11-18 V.

•	The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0192

The ECM detects that the fuel rail pressure sensor signal voltage is low.

P0193

The ECM detects that the fuel rail pressure sensor signal voltage is high.

Action Taken When the DTC Sets

•	DTCs P0192 and P0193 are Type A DTCs.

•	A message center or an indicator may display Reduced Engine Power.

Conditions for Clearing the DTC

DTCs P0192 and P0193 are Type A DTCs.

Reference Information

Schematic Reference

Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description (LF1) Fuel System Description (LAU or LY7)

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

1.	Ignition ON, check the diagnostic trouble code (DTC) information with a scan tool. DTC P0641 should not be set.

2.	If a DTC is set, refer to DTC P0641, P0651, P0697, or P06A3 (ECM, LF1) .

3.	Engine idling, check the DTC information with a scan tool. DTCs P0192 or P0193 should not set.

4.	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.

Circuit/System Testing

1.	Ignition OFF, disconnect the B47B fuel rail pressure sensor connector.

2.	Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal C and ground.

3.	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

4.	Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal A and ground.

5.	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 ECM.

6.	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 ECM.

7.	Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is less than 0.02 V.

8.	If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

9.	Connect a 3 A fused jumper wire between the signal circuit terminal B and the 5 V reference circuit terminal A. Verify the scan tool Fuel Rail Pressure Sensor Voltage parameter is greater than 4.96 V.

10.	If less than the specified value, test the signal circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.

11.	If all circuits test normal, replace the B47B fuel rail pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail

•	Control Module References for ECM replacement, setup, and programming

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