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 PCM as a wheel position signal. Controlling idle speed valve, PCM 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., PCM sets P0552. MIL(Malfunction Indicatin Lamp) turns on when the malfunction lasts till cosecutive 2 driving cycle.
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 PCM
Enable Conditions
? Engine works
? 11V = Battery voltage = 16V
Threshold value
? Sensor output voltage < 0.25V
Diagnosis Time
? Continuous
MIL On Condition
? 2 driving cycles
Pressure(Kgf/?)
37.9
41.3
68.8
96.4
Voltage(V)
1
2
3
4