P0521 Engine Oil Pressure Sensor Performance
October 31, 2017
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P0521 Engine Oil Pressure Sensor Performance - The engine oil pressure is below the calibrated specification for more than 29.8 seconds with the engine speed at or above 1150 rpm.
Step 2. Engine oil/ engine mechanical
The following items should be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis.
Possible causes P0521 code
- Engine oil/engine mechanical.
- 5-Volt supply circuit open or shorted to ground.
- High resistance in the engine oil pressure sensor signal circuit.
- High resistance in the sensor return circuit.
- Engine oil pressure sensor.
- Powertrain Control Module (PCM).
Diagnose DTC P0521 Engine Oil Pressure Sensor Performance
Step 1. Check for an active DTC
Make sure that the engine oil is at the proper level. Also, review the customers oil change history to ensure that the oil being changed at the correct intervals and that the proper oil viscosity is being used.
Test drive or operate the vehicle in accordance with the when monitored and set conditions. With the scan tool, read DTC.
Is the DTC active or pending?
YES, go to step 2.
NO, perform the the PCM intermittent condition.
Step 2. Engine oil/ engine mechanical
The following items should be considered before determining the cause of this DTC. Failure to do so may lead to misdiagnosis.
- Engine mechanical tolerances out of specification
- Engine oil pressure out of specification.
- Low engine oil.
- Deteriorated or dirty oil.
- Engine oil contaminated (i.e., coolant and/or fuel).
If any of the above conditions present?
YES, repair as necessary.
NO, go to step 3.
Step 3. Engine oil pressure sensor
Trun the ignition off, disconnect the Engine Oil Pressure harness connector. Turn the ignition on, with the scan tool, monitor the Engine Oil pressure sensor voltage. Connect a jumper between the sensor ground and the Engine Oil Pressure signal circuit.
Engine oil pressure voltage should change from approximately 4.9 volts to less than 0.1 volt.
Is the voltage reading within the listed specification when the jumper is installed?
YES, verify that there is good pin to terminal contact in the sensor and PCM connectors. Remove the engine oil pressure sensor and ensure the oil passage/port is free from any blockage. If no problem is found, replace the engine oil pressure sensor.
NO, go to step 4.
Step 4. Check for high resistance the Engine Oil Presusre signal circuit
Turn the ignition off, disconnect the PCM harness connector. Measure the resistance of the Engine Oil Pressure signal circuit from the engine oil pressure sensor harness connector to the PCM harness connector.
Is the resistance below 3.0 Ohms?
YES, go to step 5.
NO, repair the high resistance or open in the Engine Oil Pressure signal circuit.
Step 5. Check for high resistance in the 5-Volt supply circuit
Measure the resistance of the 5-Volt supply circuit from the Engine Oil Pressure sensor harness connector to the PCM harness connector.
Is the resistance below 3.0 Ohms?
YES, go to step 6.
NO, repair the high resistance in the 5-Volt supply circuit.
Step 6. Check for high resistance in the sensor ground circuit
Measure the resistance of the sensor ground circuit from the Engine Oil Pressure sensor harness connector to the PCM harness connector.
Is the resistance below 3.0 Ohms?
YES, go to step 7.
NO, repair the high resistance in the sensor ground circuit.
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