PCC1302 generator engine oil pressure sensor is out of range – shorted low. An “OIL PRESSURE SENSOR OOR” warning is displayed after the fault condition is sensed for 10 seconds.
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Possible Causes:
1Failed oil pressure sensor connections
2Failed oil pressure sensor
3Failed engine harness
4Failed extension harness
5Verify the calibrations in the ECM and the PowerCommand controls
Diagnosis and Repair:
1 Failed oil pressure sensor connections
a.Visually inspect the oil pressure sensor and harness connector pins.
a.Disconnect the engine harness connector from the crankshaft speed sensor.
b.Inspect for corroded, bent broken, pushed back, expanded, or loose pins.
c.Inspect for evidence of moisture in or on the connector.
d.Inspect for missing or damaged connector seals.
e.Inspect for dirt or debris in or on the connector pins.
2 Failed oil pressure sensor
a.Check the oil pressure sensor supply voltage.
a.Disconnect the engine harness connector from the oil pressure sensor.
b.Install the pressure sensor breakout cable between the sensor and the sensor harness connector.
c.Measure the supply voltage by connecting the breakout cable’s supply and return connectors to the multimeter. If the reading is between 4.75 and 5.25 VDC, then the supply voltage is correct.
b.Check the oil pressure sensor signal (sense) voltage.
a.Disconnect the engine harness connector from the oil pressure sensor.
b.Install the pressure sensor breakout cable between the sensor and the sensor harness connector.
c.Measure the signal voltage by connecting the breakout cable’s signal and return connectors to the multimeter. If the reading is between 0.46 and 4.56 V, then the signal voltage is correct. If not, sensor is faulty.
3 Faulty engine harness
a.Inspect the engine harness and the connector pins.
a.Disconnect the engine harness connector from the extension harness.
b.Inspect for corroded pins, bent or broken pins, pushed back or expanded pins.
c.Inspect for evidence of moisture in or on the connector.
d.Inspect for missing or damaged connector seals.
e.Inspect for dirt or debris in or on the connector pin.
b.Check for a short circuit from pin to pin.
a.Disconnect the engine harness from the extension harness.
b.Disconnect the engine harness connector from the oil pressure sensor.
c.Disconnect the engine harness from all sensors that have a shared supply or return with the oil pressure sensor.
d.Measure the resistance from the oil pressure 5 VDC supply pin on the engine harness inline connector to all other pins in the engine harness inline connector.
e.Measure the resistance from the oil pressure return pin on the engine harness inline connector to all other pins in the engine harness inline connector.
f.Measure the resistance from the oil pressure signal pin on the engine harness inline connector to all other pins in the engine harness inline connector.
g.If all measurements are greater than 100k ohms, then the resistance is correct.
c.Check for a short circuit to engine block ground.
a.Disconnect the extension harness from the control.
b.Disconnect the extension harness from the engine harness.
c.Measure the resistance from the oil pressure signal pin on the extension harness connector to the engine block ground.
d.Measure the resistance from the oil pressure 5 VDC pin on the extension harness connector to the engine block ground.
e.If the measurement is more than 100k ohms, then the resistance is correct.
4 Faulty extension harness
a.Inspect the extension harness and the generator set control connector pins.
a.Disconnect the extension harness connector from the control.
b.Inspect for corroded, bent broken, pushed back, expanded, or loose pins.
c.Inspect for evidence of moisture in or on the connector.
d.Inspect for missing or damaged connector seals.
e.Inspect for dirt or debris in or on the connector pins.
b.Check for a short circuit from pin to pin.
a.Disconnect the extension harness connector from the control.
b.Disconnect the extension harness from the engine harness.
c.Measure the resistance from the crankshaft speed sensor 5 VDC supply pin on the extension harness connector to all other pins in the extension harness connector.
d.Measure the resistance from the crankshaft speed return pin on the extension harness connector to all other pins in the extension harness connector.
e.Measure the resistance from the crankshaft speed signal pin on the extension harness connector to all other pins in the extension harness connector.
f.If all measurements are greater than 100k ohms, then the resistance is correct.
c.Check for a short circuit to engine block ground.
a.Disconnect the extension harness from the control.
b.Disconnect the extension harness from the engine harness.
c.Measure the resistance from the oil pressure signal pin on the extension harness connector to the engine block ground.
d.Measure the resistance from the oil pressure 5 VDC pin on the extension harness connector to the engine block ground.
e.If the measurement is more than 100k ohms, then the resistance is correct.
d.Check for an open circuit.
a.Disconnect the extension harness from the control.
b.Disconnect the extension harness from the engine harness.
c.Measure the resistance from the engine oil temperature return pin on the extension harness connector to the engine oil temperature return pin at the extension harness inline connector.
d.Measure the resistance from the engine oil temperature signal pin on the extension harness connector to the engine oil temperature signal pin at the extension harness inline connector.
e.If the measurement is less than 10 ohms, then the resistance is correct.
5 Verify the calibrations in the ECM and the PowerCommand controls
a.Using the display or the InPower Service tool, verify the calibration in the PCC.
a.If the calibration in the PCC matches the latest calibration on the InCal website, then the calibration is correct. If it does not, update the calibration to the latest.
b.Using the InSite Service tool, verify the calibration in the ECM.
a.If the calibration in the ECM matches the latest calibration on QSOL, then the calibration is correct. If it does not, update the ECM to the latest calibration.
More repair cases please refer to:PCC1302 PowerCommand trouble repair
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