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P0193




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





Circuit/System Description

The fuel rail pressure (FRP) 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 low reference circuit. The ECM receives a varying signal voltage on the signal circuit. The ECM monitors the voltage on the FRP 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

* The ignition is ON or the engine is running.
* The DTCs run continuously within the enabling conditions.

Conditions for Setting the DTC

P0192

The ECM detects that the signal circuit voltage is less than 0.3 volt for greater than 4 seconds.

P0193

The ECM detects that the signal circuit voltage is greater than 4.7 volts for greater than 4 seconds.

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 ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning)for scan tool information

Circuit/System Verification

1. Ignition ON, observe the DTC information with a scan tool, DTC P0641, P0642, or P0643 should not be set.

• If a DTC is set, refer to DTC P0641-P0643, P0651-P0653, or P0697-P0699 (ECM) (ECM).

2. Engine idling, observe the DTC information with a scan tool. DTC P0192 or P0193 should not set.
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.

Circuit/System Testing

1. Ignition OFF, disconnect the multi-way harness connector X161 at the rear of the intake manifold.
2. Remove the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.

Note: Testing for steps 3 through 7 is performed on the ECM side of the multi-way harness connector.

3. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal 5 and ground.

• 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. Install the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
5. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 11 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 ECM.
• 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.

6. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V.

• If less than the specified value, test the signal circuit terminal 12 for a short to ground. If the circuit tests normal, replace the ECM.

7. Connect a 3 A fused jumper wire between the signal circuit terminal 12 and the low reference circuit terminal 5. Verify the scan tool Fuel Rail Pressure Sensor voltage parameter transitions from greater than 4.96 V to less than 0.02 V.

• If the parameter does not transition from the maximum to minimum value, test the signal circuit for an open/high resistance or a short to voltage. If the circuit tests normal, replace the K20 ECM.

8. Ignition OFF, remove the intake manifold.
9. Connect the multi-way harness connector X161.

Note: Testing for steps 12 through 16 are performed at the FRP sensor connector.

10. Disconnect the B47 FRP sensor connector.
11. Remove the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
12. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal 1 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance.

13. Install the fuse that supplies B+ to terminal 56-X2 of the K20 ECM.
14. 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 greater than the specified range, test the 5 V reference circuit for a short to voltage.

15. Ignition ON, verify the scan tool Fuel Rail Pressure Sensor voltage parameter is greater than 4.96 V.

• If less than the specified value, test the signal circuit terminal 2 for a short to ground.

16. Connect a 3 A 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 transitions from greater than 4.96 V to less than 0.02 V.

• If the parameter does not transition from the maximum to the minimum value, test the signal circuit for an open/high resistance or a short to voltage.

17. If all circuits test normal, replace the B47 FRP sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail (Fuel Pressure Sensor Replacement - Fuel Injection Fuel Rail)
* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming

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