Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 10 (ENGINE CONTROL SYSTEM - 6.6L (LLY) - DTC P0016 TO DTC P0342)DTC P0191 - P0193CIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V
Circuit/System Testing
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Circuit/System Testing
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
Fuel pressure control will be disable if DTC P0087, P0088, P0912, or P0193 are set. Codes must be cleared to enable the device control.
P0191
- Turn OFF the ignition.
- Disconnect the ECM connector and the fuel pressure regulator connector.
- Test the fuel pressure regulator solenoid supply voltage circuit for a short to voltage.
- Disconnect the FRP sensor.
- Test the FRP signal circuit, the 5-volt reference circuit, and the low reference circuit for high resistance.
- If all circuits test normal, replace the FRP sensor.
P0192
- Turn ON the ignition, with the engine OFF.
- Disconnect the FRP connector and observe the Actual Fuel Pressure parameter with a scan tool.
- If fuel pressure is 0 MPa (0 psi), test the FRP sensor signal circuit for a short to ground or a faulty ECM.
- If fuel pressure is 200 MPa (29,00 psi), replace the FRP sensor.
P0193
- Turn ON ignition, with the engine OFF.
- Disconnect the FRP sensor connector and probe the signal circuit with a test lamp connected to ground.
- If the test lamp illuminates, test the signal circuit for a short to voltage or a faulty ECM.
- Connect a DMM between the FRP 5-volt reference circuit and ground, and measure the voltage.
- If the voltage is not 0.254-4.75 volts, test for an open in the 5-volt reference circuit or a faulty ECM.
- Connect a fused jumper between the FRP signal circuit and the low reference circuit and observe the actual fuel rail pressure parameter with a scan tool.
- If fuel pressure goes to 0 MPa, replace the FRP sensor.
- If fuel pressure does not go to 0 MPa, test the signal circuit and the low reference circuit for an open or a faulty ECM.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.