Code No.P0946: Electric Oil Pump Relay Stuck On <Vehicles with AS&G system>


DIAGNOSTIC FUNCTION


CVT-ECU monitors if the electric oil pump relay is operating normally.

JUDGMENT CRITERIA


The electric oil pump state signal is other than 0% for 1.5 seconds or longer.

PROBABLE CAUSES



DIAGNOSTIC PROCEDURE

STEP 1. Check electric oil pump relay stand-alone itself.
Refer to .

Q. Is the check result normal?
Go to Step 2.
Replace the electric oil pump relay.

STEP 2. Perform voltage measurement at CVT-ECU connector (OPRL terminal).
(1)Turn the ignition switch to the "ON" position.
(2)Measure the voltage between CVT-ECU connector OPRL terminal and earth at ECU side.
OK: System voltage

Q. Is the check result normal?
Go to Step 4.
Go to Step 3.

STEP 3. Check for short to earth in OPRL line between the electric oil pump relay connector and the CVT-ECU connector.

Q. Is the check result normal?
Replace the CVT-ECU.
Repair the connector(s) or wiring harness.

STEP 4. Check for short to power supply in power supply line between the electric oil pump relay connector and the electric oil pump connector.

Q. Is the check result normal?
Go to Step 5.
Repair the connector(s) or wiring harness.

STEP 5. Perform voltage measurement at electric oil pump connector (input terminal).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Measure the voltage between the electric oil pump connector (input terminal) and body earth.
(3)Turn the ignition switch to the "ON" position.
OK: System voltage

Q. Is the check result normal?
Go to Step 7.
Go to Step 6.

STEP 6. Check for short to earth in EOPI line between the CVT-ECU connector and the electric oil pump connector.

Q. Is the check result normal?
Replace the CVT-ECU.
Repair the wiring harness.

STEP 7. Reconfirmation of diagnosis code

Q. Is the diagnosis code set?
Replace the CVT-ECU.
Intermittent malfunction.