P0192
DTC P0192 or P0193
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P0192
- Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage
DTC P0193
- Fuel Rail Pressure (FRP) Sensor Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The fuel rail pressure sensor has a 5 volt reference circuit, a signal circuit, and a low reference circuit. The engine control module (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. The ECM uses this signal to compared the calculated desired fuel rail pressure with the actual fuel rail pressure from the fuel rail pressure sensor in order to maintain proper engine performance. If the ECM detects a fault on any of the fuel rail pressure sensor circuits a DTC will set.
Conditions for Running the DTC
* The ignition is ON.
* DTC runs continuously.
Conditions for Setting the DTC
P0192
The ECM detects the signal circuit voltage that is less than 0.189 V for less than 1 s.
P0193
The ECM detects that the signal circuit voltage is more than 4.81 V for less than 1 s.
Action Taken When the DTC Sets
* DTCs P0192 and P0193 are Type A DTCs.
* The ECM commands the engine to operate in the Reduced Engine Power mode.
* The message center displays Reduced Engine Power.
Conditions for Clearing the MIL/DTC
DTCs P0192 and P0193 are Type A DTCs.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Description and Operation
Fuel System Description Fuel System Description
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
Note: You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.
1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0641 is not set.
• If DTC P0641 is set, refer to DTC P0641, P0651, P0697, P06A3, P06D2, or P06D6 Powertrain Management for further diagnosis.
2. Observe the Fuel Rail Pressure Sensor parameters with a scan tool. During engine cranking, the pressure should be at least 10 MPa (1450 psi). With the engine running at idle, the Actual Fuel Rail Pressure should be close to the Desired Fuel Rail Pressure.
3. Increase engine speed to 1800 RPM, observe that the Actual Fuel Rail Pressure should be close to the Desired Fuel Rail Pressure.
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
Note: Fuel pressure control will be disable if DTC P128E, P0192, or P0193 are set. Codes must be cleared to enable the device control.
1. Ignition OFF, all vehicle systems OFF, wait 2 minutes for the ECM to power down. Disconnect the harness connector at the B47B fuel rail pressure sensor.
2. Test for less than 5 ohm between the Fuel Rail Pressure Sensor Low Reference circuit terminal 1 and ground.
• If greater than the specified range, test the Fuel Rail Pressure Sensor Low Reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
3. Ignition ON, test for 4.8-5.2 V between the Fuel Rail Pressure Sensor 5 Volt Reference circuit terminal 3 and ground.
• If less than the specified range, test the Fuel Rail Pressure Sensor 5 Volt 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 Fuel Rail Pressure Sensor 5 Volt Reference circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
4. Verify the scan tool Fuel Rail Pressure is greater than 219 MPa (31,763 psi).
• If less than the specified range, test the Fuel Rail Pressure Sensor Signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 engine control module.
5. Install a 3 A fused jumper wire between the Fuel Rail Pressure Sensor Signal circuit terminal 2 and the Fuel Rail Pressure Sensor Low Reference circuit terminal 1. Verify the scan tool Fuel Rail Pressure parameter is less than 1 MPa (145 psi).
• If greater than the specified range, test the Fuel Rail Pressure Sensor Signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
6. If all circuits test normal, replace the B47B fuel rail pressure sensor.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement Fuel Injection Fuel Rail Fuel Pressure Sensor Replacement
* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration procedure.
* Control Module References Control Module References for ECM replacement, programming, and setup.