To reduce the required power to manipulate steering wheel, hydraulic pressure is used in power steering system. A load is sensed at steering oil pressure sensor then inputted to ECM as a wheel position signal. Controlling idle speed valve, ECM performs appropriate electric load correction With this signal.
Checking output signals from P/S PS(power steering pressure sensor) every 2.5 sec. under detecting condition, if an signal below 0.05V lasts for more than 1.25 sec., ECM sets P0552. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till consecutive 2 driving cycles.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Detects sensor signal short to low voltage | 1. Poor connection 2. Open in power circuit 3. Open or short to ground in signal circuit 4. Faulty P/S pressure sensor 5. Faulty ECM |
Enable Conditions |
•
Engine works
•
11V ≤ Battery voltage ≤ 16V | |
Threshold value |
•
Sensor output voltage < 0.25V | |
Diagnosis Time |
•
Continuous (More than 10 seconds failure for every 20 seconds test) | |
MIL On Condition |
•
NO MIL ON(DTC only) |
Pressure(kpa) | 1350 | 4050 | 6749 | 9449 | 10800 |
Voltage(V) | 1 | 2 | 3 | 4 | 4.5 |
