Engine Oil Pressure (EOP) Sensor
The EOP sensor has been introduced in order to provide feedback for the Variable Oil Pump which is used to control oil pressure in the engine. Unlike the EOP switch, the EOP sensor provides a voltage proportional to the actual oil pressure in one of the oil galleries. The location of the EOP sensor varies, but it is usually mounted near the oil pump or the oil filter. The EOP sensor is continuously monitored for circuit faults by monitoring the input voltage. A rationality check is performed using calculated average pressures during engine off and engine running conditions. Any detected sensor fault illuminates the 'Low Oil Pressure' Warning Lamp on the instrument cluster and will initiate PTLP (Powertrain Limiting Protection) modes to protect the engine.
EOP SENSOR TRANSFER FUNCTION
| Vout=(Vref) * (0.0008 * Pressure (in kPa) + 0.10) |
| Volts |
Pressure, kPa |
Pressure, psi |
| 0.500 |
0 |
0 |
| 0.660 |
40 |
5.80 |
| 0.820 |
80 |
11.60 |
| 0.980 |
120 |
17.40 |
| 1.140 |
160 |
23.21 |
| 1.300 |
200 |
26.11 |
| 1.460 |
240 |
34.81 |
| 1.620 |
280 |
40.61 |
| 1.780 |
320 |
46.41 |
| 1.94 |
360 |
52.21 |
| 2.100 |
400 |
58.02 |
| 2.260 |
440 |
63.82 |
| 2.420 |
480 |
69.62 |
| 2.580 |
520 |
75.42 |
| 2.740 |
560 |
81.22 |
| 2.900 |
600 |
87.02 |
| 3.060 |
640 |
92.82 |
| 3.220 |
680 |
98.63 |
| 3.380 |
720 |
104.43 |
| 3.700 |
800 |
116.03 |
| 4.020 |
880 |
127.63 |
| 4.340 |
960 |
139.24 |
| 4.420 |
980 |
142.14 |
| 4.500 |
1000 |
145.04 |
EOP Sensor Circuit Check Operation
| DTCs |
Analog Sensor
P0522: Engine Oil Pressure Sensor "A" Circuit Low
P0523: Engine Oil Pressure Sensor "A" Circuit High |
| Monitor Execution |
Continuous |
| Monitor Sequence |
None |
| Sensors OK |
Not Applicable |
| Monitoring Duration |
5 seconds to register a malfunction |
EOP SENSOR CIRCUIT CHECK ENTRY CONDITIONS
| Battery voltage > 11.0 volts |
TYPICAL EOP SENSOR CIRCUIT CHECK MALFUNCTION THRESHOLDS
| Voltage < 0.43 volts or voltage > 3.40 volts |