P0554
Power Steering Pressure Switch Circuit:
Connectors:
DTC P0554: Power Steering Pressure Switch 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. 54) or PCM (terminal No. 52) via the resistor in the ECM
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
- 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
DESCRIPTIONS OF MONITOR METHODS
Power steering pressure switch stays on during specified go/stop operations.
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 10° C (50° F).
- Vehicle speed is higher than 50 km/h (31 mph).
Judgment Criteria
- The ON/OFF frequency of a power steering pressure switch is 10 Hz or more for 20 seconds.
OBD-II DRIVE CYCLE PATTERN
None.
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
- Power steering pressure switch failed.
- Incorrect power steering fluid level.
- Incorrect oil pump pressure.
- Harness damage in power steering pressure switch circuit, or connector damage.
- PCM failed.
DIAGNOSIS
Required Special Tool:
- MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 27: Power Steering Pressure Switch.
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for item 27, Power Steering Pressure Switch.
- If the steering wheel is stopped while idling, "OFF" will be displayed.
- If the steering wheel is steered while idling, "ON" will be displayed.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES: It can be assumed that this malfunction is intermittent. Refer to INTRODUCTION, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.
NO: Go to Step 2.
STEP 2. Check the power steering fluid level. Refer to On-Vehicle Service - Fluid Level Check.
Q: Are there any abnormalities?
YES: Repair it. Then go to Step 7.
NO: Go to Step 3.
STEP 3. Check the power steering pressure switch. Refer to On-Vehicle Service - Power Steering Pressure Switch Check.
Q: Are there any abnormalities?
YES: Replace the power steering pressure switch. Then go to Step 7.
NO: Go to Step 4.
STEP 4. Check the oil pump pressure. Refer to On-Vehicle Service - Oil Pump Pressure Test.
Q: Are there any abnormalities?
YES: Repair it. Then go to Step 7.
NO: Go to Step 5.
STEP 5. Check harness connector B-19 at the power steering pressure switch and harness connector C-118 at ECM or C-115 at PCM for damage.
Q: Is the harness connector in good condition?
YES: Go to Step 6.
NO: Repair or replace it. Refer to Harness Connector Inspection. Then go to Step 7.
STEP 6. Check for harness damage between power steering pressure switch connector B-19 (terminal No. 1) and ECM connector C-118 (terminal No. 54) or PCM connector C-115 (terminal No. 52).
NOTE: Check harness after checking intermediate connector B-117. If intermediate connector is damaged, repair or replace them. Refer to Harness Connector Inspection. Then go to Step 7.
Q: Is the harness wire in good condition?
YES: Replace the PCM. Then go to Step 7.
NO: Repair it. Then go to Step 7.
STEP 7. Using scan tool MB991502, check data list item 27: Power Steering Pressure Switch.
CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.
1. Connect scan tool MB991502 to the data link connector.
2. Start the engine and run at idle.
3. Set scan tool MB991502 to the data reading mode for item 27, Power Steering Pressure Switch.
- If the steering wheel is not turned while idling, "OFF" will be displayed.
- If the steering wheel is turned while idling, "ON" will be displayed.
4. Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the switch operating properly?
YES: The inspection is complete.
NO: Retry the troubleshooting.