P0554
DTC P0554: Power Steering Pressure Sensor Circuit IntermittentPower Steering Pressure Switch Circuit Part 1:
Power Steering Pressure Switch Circuit Part 2:
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) 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
DTC SET CONDITIONS
Check Conditions
- Engine coolant temperature is higher than 30 °C (86 °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.
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 loose connector.
- ECM
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 How to Use Troubleshooting/Inspection Service Points.
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: Go to Step 3.
NO: Repair it. Then go to Step 7.
STEP 3. Check the power steering pressure switch.
Refer to On-Vehicle Service - Power Steering Pressure Switch Check.
Q: Are there any abnormalities?
YES: Go to Step 4.
NO: Replace the power steering pressure switch. Then go to Step 7.
STEP 4. Check the oil pump pressure.
Refer to On-Vehicle Service - Oil Pump Pressure Test.
Q: Are there any abnormalities?
YES: Go to Step 5.
NO: Repair it. Then go to Step 7.
STEP 5. Check connector B-116 at the power steering pressure switch and connector C-119 at ECM
Q: Is the 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-116 (terminal No. 1) and ECM connector C-119 (terminal No. 37)
Q: Is the harness wire in good condition?
YES: Replace the ECM
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 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 switch operating properly?
YES: The procedure is complete.
NO: Repeat the troubleshooting.