DTC P0521, P0522, or P0523
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DTC P0521, P0522, or P0523
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DTC P0521
Engine Oil Pressure Sensor Performance
DTC P0522
Engine Oil Pressure Sensor Circuit Low Voltage
DTC P0523
Engine Oil Pressure Sensor Circuit High Voltage
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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Signal Performance
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5V Reference
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P0522
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P0523
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P0523
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P0521
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Signal
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P0522
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P0523
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P0523
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P0521
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Low Reference
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-
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P0523
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-
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P0521
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Circuit/System Description
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The engine oil pressure sensor changes voltage based on the engine oil pressure. The engine oil pressure sensor is a 3-wire sensor comprised of the signal circuit, the low reference circuit and the 5 V reference circuit. The engine control module (ECM) supplies 5 V to the engine oil pressure sensor via the 5 V reference circuit and provides ground via the engine oil pressure sensor low reference circuit. The ECM monitors the signal circuit of the engine oil pressure sensor to determine the engine oil pressure sensor voltage is within the normal operating range of approximately 1-4 V. When the engine oil pressure is high, the engine oil pressure sensor voltage is high and the sensor senses a high signal voltage. When the engine oil pressure is low, the engine oil pressure sensor voltage is low and the ECM senses a low signal voltage. The ECM sends the engine oil pressure sensor information via High Speed CAN-Bus to the body control module (BCM). The BCM then sends the engine oil pressure sensor information via Low Speed CAN-Bus to the instrument cluster.
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Conditions for Running the DTC
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The engine is running.
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Conditions for Setting the DTC
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P0521
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The engine oil pressure is out of its working range.
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The ECM does not detect a change in the engine oil pressure.
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The above condition is present over a predetermined variance of engine speed.
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P0522
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The ECM detects a short to ground in the engine oil pressure signal circuit.
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The above condition is present for greater than 10 s.
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P0523
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The ECM detects a short to voltage or an open circuit in the engine oil pressure signal circuit.
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The above condition is present for greater than 10 s.
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Action Taken When the DTC Sets
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The instrument cluster illuminates the service vehicle soon indicator.
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Conditions for Clearing the DTC
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The DTC becomes history when the condition for setting the DTC is no longer present.
Schematic Reference
Instrument Cluster Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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Engine running, observe the scan tool Engine Oil Pressure Sensor parameter. The reading should be between 0.3-4.8 V.
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1.
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Ignition OFF, disconnect the harness connector at the B37B Engine Oil Pressure Sensor.
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2.
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Ignition OFF, test for less than 10 Ω between the low reference circuit terminal 1 and ground.
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3.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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4.
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Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal 2 and ground.
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5.
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If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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6.
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If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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7.
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Verify the scan tool Engine Oil Pressure Sensor parameter is greater than 4.8 V.
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8.
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If less than the specified range, test the signal circuit terminal 3 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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9.
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Install a 3 A fused jumper wire between the signal circuit terminal 3 and the low reference circuit terminal 1. Verify the scan tool Engine Oil Pressure Sensor parameter is less than 0.3 V.
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10.
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If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
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11.
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If all circuits test normal, replace the B37B Engine Oil Pressure Sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
