GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Chevrolet T-Series Medium Duty Truck F6/F7/F8 🢒 DTC 🢒 DTC P0192

DTC P0192 Without RPO CTF

Circuit Description

The engine control module (ECM) monitors the fuel rail pressure via a fuel rail pressure (FRP) sensor. When the fuel rail pressure is high the signal voltage is high. When the fuel rail pressure is low the signal voltage is low. If the fuel rail pressure is not above the lower limit for the sensor, DTC P0192 will set.

Conditions for Running the DTC
    • DTC's P0641 or P0651 are not set.
    • The ignition is ON.

Conditions for Setting the DTC

The ECM detects the signal circuit is less than 0 MPa.

Action Taken When the DTC Sets

The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.

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.
    • Clear the MIL and the DTC with a scan tool.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests for the proper operation of the circuit in the low voltage range.

    2.

  2. This step tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.

DTC P0192

Step

Action

Value(s)

Yes

No

Schematic Reference: Engine Controls Schematics

1

Did you perform the Diagnostic System Check-Engine Controls?

--

Go to Step 2

Go to Diagnostic System Check - Engine Controls

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the Actual Fuel Rail Pressure parameter in the Powertrain, Engine Data 1 list.

Does the scan tool indicate that the Actual Fuel Rail Pressure parameter is within the specified range?

1.2-1.9 MPa

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the fuel rail pressure (FRP) sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the Actual Fuel Rail Pressure parameter.

Does the scan tool indicate that the Actual Fuel Rail Pressure parameter is less than the specified value?

175 MPa

Go to Step 4

Go to Step 5

4

Test the signal circuit of the FRP sensor for a short to ground or high resistance. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 7

Go to Step 6

5

Replace the fuel rail pressure sensor.

Did you complete the replacement?

--

Go to Step 7

--

6

Replace the ECM. Refer to Engine Control Module Replacement/Restore Fuel Rate Data .

Did you complete the replacement?

--

Go to Step 7

--

7
  1. Use the scan tool in order to clear the DTCs.
  2. Turn OFF the ignition for 30 seconds.
  3. Start the engine.
  4. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC run and pass?

--

Go to Step 8

Go to Step 2

8

With a scan tool, observe the stored information, Capture Info.

Does the scan tool display any DTCs that you have not diagnosed?

--

Go to Diagnostic Trouble Code (DTC) List

System OK