Inspection Procedure 23: Engine Oil Pressure Switch System
OPERATION
- Battery voltage is applied to the oil pressure switch connector terminal from the engine-ECU connector terminal OPSW.
FUNCTION
- Detect the engine oil pressure conditions and enter the result into the engine-ECU. After starting the engine if the oil pressure rises to higher than the given pressure, the engine oil pressure switch turns OFF. Under this condition the engine-ECU sends the command of turning off the oil warning lamp to the combination meter via CAN.
PROBABLE CAUSES
- Failed engine oil pressure switch
- Open/short circuit or damage in the oil pressure switch circuit or loose connector contact
- Failed engine-ECU
|
STEP 1. Voltage measurement at oil pressure switch connector (OPSW line).
|
|
(1)Disconnect the connector, and measure at the wiring harness side.
|
|
(3)Check the voltage between the oil pressure switch connector (OPSW line) and body earth. OK: System voltage
|
|
Q.
Is the check result normal?
|
|
Go to Step 4.
|
|
|
|
Go to Step 2.
|
|
|
|
STEP 2. Check of short to earth, and open circuit in OPSW line between oil pressure switch connector and engine-ECU connector.
|
|
Q.
Is the check result normal?
|
|
Go to Step 3.
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|
|
STEP 3. M.U.T.-III data list
|
|
- Refer to Data List Reference Table
.
- 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. Voltage measurement at engine-ECU connector (OPSW terminal).
|
|
(1)Disconnect engine-ECU connector, and connect special tool power plant ECU check harness (MB992110) to measure at connector for inspection.
|
|
(3)Check the voltage between the engine-ECU connector (OPSW terminal) and body earth. OK:
1 V or less (ignition switch: ON) System voltage (during idling)
|
|
Q.
Is the check result normal?
|
|
Go to Step 3.
|
|
|
|
Go to Step 5.
|
|
|
|
STEP 5. Check of harness damage in OPSW line between oil pressure switch connector and engine-ECU connector.
|
|
Q.
Is the check result normal?
|
|
Replace the oil pressure switch.
|
|
|
|
Repair the connector(s) or wiring harness.
|
|
|