Code No. P0558: Brake Booster Pressure Sensor Circuit High Input




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 171: Brake booster pressure sensor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Perform resistance measurement at brake booster pressure sensor connector.



  • Disconnect connector, and measure at harness side.
  • Resistance between terminal engine-ECU BPES line and body earth.
OK: Continuity (2 Ω or less)

Q. Is the check result normal?

Go to Step 5.
Go to Step 3.

STEP 3. Check harness between brake booster pressure sensor connector terminal and engine-ECU connector terminal BPES.



  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 4.
Repair or replace the connector, or repair the damaged harness wire.

STEP 4. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 171: Brake booster pressure sensor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.

STEP 5. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 171: Brake booster pressure sensor

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 6.

STEP 6. Replace the brake booster pressure sensor



  • After replacing the brake booster pressure sensor, reconfirm whether the diagnosis code is set.

Q. Is the diagnosis code set?

Replace the engine-ECU.
Check end.