Code No. P0193: Rail Pressure Sensor Circuit High Input




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgment 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 63: Rail 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 voltage measurement at rail pressure sensor connector.



  • Disconnect connector, and measure at harness side.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU FPS5 line and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?

Go to Step 5.
Go to Step 3.

STEP 3. Check harness between rail pressure sensor connector terminal and engine-ECU connector terminal FPS5.



  • Check power supply line for open/short circuit.

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 63: Rail 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. Perform resistance measurement at rail pressure sensor connector.



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

Q. Is the check result normal?

Go to Step 7.
Go to Step 6.

STEP 6. Check harness between rail pressure sensor connector terminal and engine-ECU connector terminal FPSE.



  • Check earthing line for open circuit and damage.

Q. Is the check result normal?

Go to Step 10.
Repair or replace the connector, or repair the damaged harness wire.

STEP 7. Check harness between rail pressure sensor connector terminal and engine-ECU connector terminal FPS5.



  • Check power supply line for damage.

Q. Is the check result normal?

Go to Step 8.
Repair or replace the connector, or repair the damaged harness wire.

STEP 8. Check harness between rail pressure sensor connector terminal and engine-ECU connector terminal FPS.



  • Check output line for open circuit and damage.

Q. Is the check result normal?

Go to Step 9.
Repair or replace the connector, or repair the damaged harness wire.

STEP 9. Voltage measurement at rail pressure sensor connector.



  • Disconnect connector, and measure at sensor side.
  • With the special tool test harness (MB991658) bridge only the mating terminals of engine-ECU FPS5 line and engine-ECU FPSE line of the disconnected connector.
  • Ignition switch: ON
  • Voltage between terminal engine-ECU FPS line and body earth.
OK: 0.85 V or more

Q. Is the check result normal?

Go to Step 10.
Replace the rail pressure sensor.

STEP 10. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 63: Rail 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.