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Home >> Hummer >> 2006 >> H1 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0192

P0192



DTC P0192

DTC DESCRIPTORS

DTC P0191
Fuel Rail Pressure (FRP) Sensor Performance

DTC P0192
Fuel Rail Pressure (FRP) Sensor Circuit Low Voltage

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

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

TYPICAL SCAN TOOL DATA

Actual Fuel Rail Pressure:






CIRCUIT/SYSTEM DESCRIPTION
The fuel rail pressure (FRP) 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 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. The fuel pressure regulator has a solenoid supply voltage circuit and a solenoid control circuit. The ECM controls the fuel pressure regulator , which regulates high pressure fuel that goes to the fuel injector rails and the injectors.

CONDITIONS FOR RUNNING THE DTC

P0191
- DTCs P0016, P062F, P0116, P0117, P0118, P0192, P0193, P0652 or P0653 are not set.
- The ignition is ON, with the engine OFF.OR
- The ignition has been off less than 70 seconds.
- This diagnostic runs continuously within the above conditions.

P0192 and P0193
- The ignition is ON.
- DTCs P0652 or P0653 are not set.
- These diagnostics run continuously within the enabling conditions.

CONDITIONS FOR SETTING THE DTC

P0191
- The actual FRP is below 0 MPa (0 psi), or above 0.77 MPa (112 psi), when the ignition is ON and the engine is OFF.OR
- The actual FRP is below 0 MPa (0 psi), or above 0.77 MPa (112 psi) within 70 seconds of the ignition being turned OFF.

P0192
The ECM detects the signal circuit voltage that is less than 0.254 volts for more than one second.

P0193
The ECM detects that the signal circuit voltage is more than 4.75 volts for more than one second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION

IMPORTANT: If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.

Observe the Actual Fuel Rail Pressure parameter with a scan tool. During engine cranking, the pressure should be at least 10 MPa. With the engine running at idle, the pressure should be close to the Desired Fuel Rail Pressure. As the engine speed increases, the Desired Fuel Rail Pressure and the Actual Fuel Rail Pressure should closely match each other.

CIRCUIT/SYSTEM TESTING

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
1. Turn OFF the ignition.
2. Disconnect the ECM connector and the fuel pressure regulator connector.
3. Test the fuel pressure regulator solenoid supply voltage circuit for a short to voltage.
4. Disconnect the FRP sensor.
5. 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
1. Turn ON the ignition, with the engine OFF.
2. 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
1. Turn ON ignition, with the engine OFF.
2. 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.
3. 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.
4. 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.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Fuel Rail Pressure (FRP) Sensor Replacement
- Control Module References for ECM replacement, programing and setup
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