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Circuit Description

The engine oil pressure (EOP) sensor changes resistance based on engine oil pressure. The powertrain control module (PCM) monitors the signal circuit of the EOP sensor. When the engine oil pressure is high, the sensor resistance is high, and the PCM senses a high signal voltage. When the engine oil pressure is low, the sensor resistance is low, and the PCM senses a low signal voltage. The PCM sends the engine oil pressure information to the instrument panel cluster (IPC) via the class 2 serial data circuit.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC P0522 Engine Oil Pressure (EOP) Sensor Circuit Low Voltage

Conditions for Running the DTC
    • The engine is running.
    • DTC P1635, (LBZ, LLY, LMM, and late L18) or DTC P0641, (early L18 and LG4) is not present.

Conditions for Setting the DTC
    • The PCM detects that the EOP sensor signal circuit is less than 0.4 volts.
    • The above condition is present for greater than 9 seconds.

Action Taken When the DTC Sets

The PCM records the operating conditions at the time the diagnostic test fails. The PCM displays this information in the Failure Records on the scan tool.

Conditions for Clearing the DTC
    • The DTC becomes history when the conditions for setting the DTC are no longer present.
    • The history DTC clears after 40 malfunction-free warm-up cycles.
    • The PCM receives a clear code command from the scan tool.

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. Refer to Testing for Intermittent Conditions and Poor Connections .

Test Description

The number below refers to the step number on the diagnostic table.

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

Step

Action

Values

Yes

No

Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2
  1. Install a scan tool.
  2. Start the Engine.
  3. With the scan tool, observe one of the following Engine Oil Pressure parameters:
    4. • Engine Oil Pressure Sensor Parameter in the Fuel Data data list (LBZ, LLY, LMM, and LG4 only)
    • Engine Oil Pressure Sensor parameter in the powertrain control module (PCM) Engine Data 2 data list (L18 only)

Does the scan tool indicate that the Engine Oil Pressure parameter is at or less than the specified value?

0.4 V

Go to Step 3

Go to Diagnostic Aids

3

Is DTC P1635, (LBZ, LLY, LMM, and late L18) or DTC P0641, (early L18 and LG4) current in the powertrain control module (PCM)?

--

Go to Diagnostic Trouble Code (DTC) List - Vehicle

Go to Step 4

4

  1. Turn the ignition OFF.
  2. Disconnect the engine oil pressure (EOP) sensor.
  3. Connect a 3-amp fused jumper between the EOP sensor signal circuit and the 5-volt reference circuit of the EOP sensor.
  4. With the scan tool, observe one of the following engine oil pressure parameters:
    5. • Engine Oil Pressure Sensor Parameter in the Fuel Data data list (LBZ, LLY, LMM, and LG4 only)
    • Engine Oil Pressure Sensor parameter in the PCM Engine Data 2 data list (L18 only)

Does the scan tool indicate that the Engine Oil Pressure parameter is at or greater than the specified value?

4.6 V

Go to Step 8

Go to Step 5

5
  1. Disconnect the fused jumper.
  2. Measure the voltage between the 5-volt reference circuit of the EOP sensor and the low reference circuit of the EOP sensor.

Does the voltage measure greater than the specified value?

4.6 V

Go to Step 7

Go to Step 6

6

Test the 5-volt reference circuit of the EOP sensor for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

7

Test the EOP sensor signal circuit for an open, for a short to ground or for a high resistance. Refer to Circuit Testing and to Wiring Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the EOP sensor. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs .

Did you find and correct the condition?

--

Go to Step 12

Go to Step 11

10

Replace the EOP sensor. Refer to one of the following procedures:

    •  Engine Oil Pressure Sensor and/or Switch Replacement for the 6.6L (LBZ and LLY) engine

Did you complete the replacement?

--

Go to Step 12

--

11

Replace the PCM. Refer to Control Module References for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 12

--

12
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.

Does the DTC reset?

--

Go to Step 2

System OK