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
Poor connection
Open in power circuit
Open or short to ground in signal circuit
Faulty P/S pressure sensor
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