Inspection Procedure 13: Oil Pressure Switch System




OPERATION




FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. Perform measurement at oil pressure switch connector



  • Disconnect connector, and measure at the harness side.
  • Power supply mode of electric motor switch: ACC
  • Voltage between terminal output line and body earth.
OK: System voltage

Q. Is the check result normal?

Go to Step 4.
Go to Step 2.

STEP 2. Check harness between oil pressure switch connector terminal and engine-ECU connector terminal OPSW.



  • Check output line for open/short circuit.

Q. Is the check result normal?

Go to Step 3.
Repair or replace the connector, or repair the damaged harness wire.

STEP 3. M.U.T.-III data list



  • Refer to Data List Reference Table .

  1. Item 90: Oil pressure switch

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 4. Perform voltage measurement at engine-ECU connector.



  • Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
  • Voltage between terminal OPSW and body earth.
OK:
    1 V or less (power supply mode of electric motor switch: ACC)
    System voltage (during idling)

Q. Is the check result normal?

Go to Step 3.
Go to Step 5.

STEP 5. Check harness between oil pressure switch connector terminal and engine-ECU connector terminal OPSW.



  • Check output line for damage.

Q. Is the check result normal?

Replace the oil pressure switch.
Repair or replace the connector, or repair the damaged harness wire.