GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2001 🢒 Corvette 🢒 Engine 🢒 Engine Controls - 5.7L 🢒 DTC P0522

Circuit Description

The Engine Oil Pressure (EOP) sensor measures changes in engine oil pressure.

The EOP sensor changes resistance based on changes in engine oil pressure. When the PCM senses a signal voltage lower than the normal operating range of the sensor, this DTC sets.

Conditions for Running the DTC

The engine is running.

Conditions for Setting the DTC

The EOP sensor voltage is less than 0.48 volts.

Action Taken When the DTC Sets
    • The PCM stores the DTC information into memory when the diagnostic runs and fails.
    • The malfunction indicator lamp (MIL) will not illuminate.
    • The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.
    • The DIC displays a oil pressure message.
    • The EOP gage displays 0 psi.

Conditions for Clearing the MIL or DTC
    • A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
    • A last test failed, or current DTC, will clear when the diagnostic runs and does not fail.
    • Use a scan tool in order to clear the DTC.

Diagnostic Aids

Important: Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the module. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.

    • Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature, etc.) that you observed. This isolates when the DTC failed.
    • For an intermittent, refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Step

Action

Values

Yes

No

Schematic Reference: Instrument Cluster Schematics

1

Did you perform the IPC Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check - Instrument Cluster

2

Important: Before proceeding with the engine oil pressure sensor diagnostic, perform the engine oil pressure test. Refer to Oil Pressure Diagnosis and Testing in Engine Mechanical.

  1. Install the scan tool.
  2. Start the engine.
  3. Monitor the DTC Information using the scan tool.

Did DTC P1635 fail this ignition cycle?

--

Go to DTC P1635 in Engine Controls

Go to Step 3

3
  1. Turn ON the ignition leaving the engine OFF.
  2. Monitor the PCM Engine Data 3 Engine Oil Pressure voltage using the scan tool.

Is the Engine Oil Pressure voltage below the specified value?

0.48 V

Go to Step 5

Go to Step 4

4
  1. Turn ON the ignition leaving the engine OFF.
  2. Review the Freeze Frame and/or Failure Records data for this DTC and observe the parameters.
  3. Turn OFF the ignition for 15 seconds.
  4. Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in the Freeze Frame/Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
  5. Select the Diagnostic Trouble Code (DTC) option, the Specific DTC option, and enter the DTC number using the scan tool.

Does the scan tool indicate that this diagnostic failed this ignition?

--

Go to Step 5

Go to Diagnostic Aids

5
  1. Disconnect the engine oil pressure sensor electrical connector. Refer to Engine Oil Pressure Sensor or Switch Replacement .
  2. Jumper the 5 volt reference circuit and the engine oil pressure signal circuit together at the engine oil pressure sensor harness connector.
  3. Observe the Engine Oil Pressure voltage display on the scan tool.

Is the Engine Oil Pressure voltage near the specified value?

5 V

Go to Step 11

Go to Step 6

6
  1. Connect the test lamp between B+ and the engine oil pressure sensor signal circuit at the engine oil pressure sensor harness connector. Refer to Circuit Testing in Wiring Systems.
  2. Observe the Engine Oil Pressure voltage display on the scan tool.

Is the Engine Oil Pressure voltage at the specified value?

5 V

Go to Step 7

Go to Step 9

7
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C1 located on the same side as the manufacturer's logo. Refer to Powertrain Control Module Replacement in Engine Controls.
  3. Test the 5 volt reference circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 8

8

Inspect the 5 volt reference circuit for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

9
  1. Turn OFF the ignition.
  2. Disconnect the PCM connector C2 located on the opposite side of the manufacturer's logo. Refer to Powertrain Control Module Replacement in Engine Controls.
  3. Test the engine oil pressure signal circuit for an open, short to ground, or a short to the sensor ground circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 10

10

Inspect the engine oil pressure sensor signal circuit for a poor connection at the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 13

Go to Step 12

11

Important: Before replacing the sensor inspect for poor connections. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Replace the engine oil pressure sensor. Refer to Engine Oil Pressure Sensor or Switch Replacement .

Did you complete the replacement?

--

Go to Step 13

--

12

Important: Program the replacement PCM.

Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls.

Did you complete the replacement?

--

Go to Step 13

--

13
  1. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC option using the scan tool.
  2. Start the engine and idle at the normal operating temperature.
  3. Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
  4. Operate vehicle within the Conditions for Running this DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?

--

Go to Step 14

Go to Step 2

14

Select the Capture Info option and the Review Info option using the scan tool.

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

--

Go to the applicable DTC table

System OK