P0551 Power Steering Pressure Sensor Circuit Range/Performance
The power steering pressure switch converts the existence of a power steering load into a high/low voltage, and inputs it into the PCM.
When the steering wheel is turned, hydraulic pressure rises. The power steering pressure switch closes, and the applied battery positive voltage will be grounded. With this, the power steering pressure switch output voltage will fluctuate between 12 volts and 0 volt.
While driving with the steering wheel held straight, the power steering pressure switch turns "OFF".
The PCM checks whether the power steering pressure switch turns "OFF" or "ON" during driving.
DTC SET CONDITIONS
Check Conditions
Engine coolant temperature is higher than 30°C (86°F).
Drive for 4 seconds or more with the vehicle speed is 50 km/h (31 mph) or more. Stop the vehicle [vehicle speed is 1.5 km/h (0.93 mph) or less]. Repeat 10 times or more.
Judgment Criteria
Power steering pressure switch continues to be "ON".
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Power steering pressure switch failed.
- Open or shorted power steering pressure switch circuit, or loose connector.
- PCM failed.
The power steering pressure switch converts the existence of a power steering load into a high/low voltage, and inputs it into the PCM.
When the steering wheel is turned, hydraulic pressure rises. The power steering pressure switch closes, and the applied battery positive voltage will be grounded. With this, the power steering pressure switch output voltage will fluctuate between 12 volts and 0 volt.
While driving with the steering wheel held straight, the power steering pressure switch turns "OFF".
The PCM checks whether the power steering pressure switch turns "OFF" or "ON" during driving.
DTC SET CONDITIONS
Check Conditions
Engine coolant temperature is higher than 30°C (86°F).
Drive for 4 seconds or more with the vehicle speed is 50 km/h (31 mph) or more. Stop the vehicle [vehicle speed is 1.5 km/h (0.93 mph) or less]. Repeat 10 times or more.
Judgment Criteria
Power steering pressure switch continues to be "ON".
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Power steering pressure switch failed.
- Open or shorted power steering pressure switch circuit, or loose connector.
- PCM failed.