GM Service Manual Online
For 1990-2009 cars only

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 00: Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage

DTC P0193 00: Fuel Rail Pressure (FRP) Sensor Circuit High Voltage

Diagnostic Fault Information

Circuit

Short to Ground

Open or High Resistance

Short to Voltage

Signal Performance

Fuel Rail Pressure (FRP) Sensor Signal

P0192 00

P0191 00 or P0193 00

P0193 00

P0191 00

Circuit/System Description

The fuel pump control module (FPCM) monitors the voltage signal from the fuel pressure sensor. These DTCs will set if the FPCM detects that the FRP sensor voltage is out of range.

Conditions for Running the DTC

The engine is running and the fuel pressure is within normal operating range.

Conditions for Setting the DTC

    • The FSCM detects that the FRP sensor signal circuit is above 4.9 V or below 0.1 V.
    •  DTC P0231, P0232, P023F, P064A, P1255 or P06A6 are not active.
    • DTC P0641 has not failed this ignition cycle.
    • Fuel pump control is enabled and the fuel pump control state is normal.

Action Taken When the DTC Sets

DTC P0192 and P0193 are B type DTCs.

Conditions for Clearing the DTC

DTC P0192 and P0193 are B type DTCs.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Fuel System Description

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

Test the fuel line pressure sensor signal circuit for a short to ground, a short to voltage or an open.

If the circuit tests normal, replace the fuel pressure sensor.

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the fuel line pressure sensor.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the low reference circuit terminal 2 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 fuel system control module.
  4. Ignition ON, test for 4.8 - 5.2 volts between the fuel line pressure sensor 5 volt reference circuit terminal 3 and ground.
  5. If less than the specified range, test the 5 volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel system control module.
    If greater than the specified range, test the 5 volt reference circuit for a short to voltage. If the circuit tests normal, replace the fuel system control module.
  6. Ignition ON, observe the Fuel Pump Control Module Fuel Rail Pressure Sensor parameter.
  7. Install a 3 A fused jumper wire between the 5 volt reference circuit terminal 3 and the fuel line pressure sensor signal circuit terminal 1. The scan tool should display between 4.8 - 5.2 volts.
  8. If less than the specified range, test the signal circuit terminal 1 for a short to ground or an open/high resistance. If the circuit tests normal, replace the fuel system control module.
  9. If all circuits test normal, replace the fuel rail pressure sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Control Module References for FPCM replacement, setup, and programming
    •  Fuel Pressure Sensor Replacement