DTC P0554: Power Steering Pressure Sensor Circuit Intermittent

CIRCUIT OPERATION
• A battery positive voltage is applied to the power steering pressure switch output terminal (terminal No. 1) from the ECM (terminal No. 37) <M/T> or PCM (terminal No. 52) <A/T> via the resistor in the ECM <M/T> or PCM <A/T>.
TECHNICAL DESCRIPTION
• The power steering pressure switch converts the existence of a power steering load into a high/low voltage, and inputs it into the ECM <M/T> or PCM <A/T>.
• 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 ECM <M/T> or PCM <A/T> checks whether the power steering pressure switch turns "OFF" or "ON" during driving.
DESCRIPTIONS OF MONITOR METHODS
• Power steering pressure switch changes from off to on more than 10 times for 1 second.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Not applicable

Sensor (The sensor below is determined to be normal)
• Engine coolant temperature sensor
DTC SET CONDITIONS Logic Flow Chart


Check Conditions
Engine coolant temperature is higher than 18°C (64°F).
Vehicle speed is higher than 50 km/h (31 mph).

Judgment Criterion
• The ON/OFF frequency of a power steering pressure switch is 10 Hz or more for 20 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 16 .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Power steering pressure switch failed.
• Air entered to power steering system.
• Open or shorted power steering pressure switch circuit, or connector damage.
• ECM <M/T> or PCM <A/T> failed.