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HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISENGINE MECHANICALENGINE LUBRICATION SYSTEM (H4DO)OIL LEVEL SWITCHINSPECTIONINSPECTION WHEN LOW ENGINE OIL WARNING LIGHT ILLUMINATES ON LCD
2016 Subaru Legacy 2.5i

Inspection When Low Engine Oil Warning Light Illuminates On LCD

2016 Subaru Legacy 2.5iSECTION Inspection When Low Engine Oil Warning Light Illuminates On LCD
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK ENGINE OIL LEVEL.  Is engine oil level normal? Go to step 2  . Replace engine oil or refill, and check again while the oil level is normal condition. < Ref. to REPLACEMENT , Engine Oil. > To disable the low engine oil warning, install the spare fuse at the delivery mode fuse in the main fuse box. Then turn the ignition switch to ON (engine off) again, to confirm the low engine oil warning is not displayed. Remove the spare fuse installed to finish.
NOTE: The engine oil level switch is normal if the low engine oil level warning is not displayed with the delivery mode fuse inserted.
2 CHECK LAN SYSTEM.  Has a DTC of the LAN system been input? Perform the diagnosis according to DTC. Go to step 3  .
3 CHECK OIL LEVEL SWITCH CIRCUIT. 
  1. Turn the ignition switch to ON (engine OFF).
  2. Read the current data for engine in the Subaru Select Monitor to confirm the item for "Oil level switch". < Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. >
 Is the "Oil level switch" signal displayed in Subaru Select Monitor HIGH? To disable the low engine oil warning, install the spare fuse at the delivery mode fuse in the main fuse box. Then turn the ignition switch to ON (engine off) again, to confirm the low engine oil warning is not displayed. Remove the spare fuse installed to finish.
NOTE: The engine oil level switch is normal if the low engine oil level warning is not displayed with the delivery mode fuse inserted.
 Go to step 4  .
4 CHECK COMBINATION METER. 
Perform the self-diagnosis of combination meter to check if there are any faults in the combination meter. < Ref. to OPERATION , Combination Meter System. >		 Is combination meter OK? Go to step 5  . Replace the combination meter. < Ref. to REMOVAL , Combination Meter. >
5 CHECK SECURE CONNECTION OF CONNECTOR BETWEEN ENGINE HARNESS AND OIL LEVEL SWITCH.  Is there any insecure connection? Repair the connection condition. Then, to disable the low engine oil warning display, install the spare fuse at the delivery mode fuse in the main fuse box. Then turn the ignition switch to ON (engine OFF) again to confirm the low engine oil warning is not displayed. Remove the spare fuse installed to finish.
NOTE: The engine oil level switch is normal if the low engine oil level warning is not displayed with the delivery mode fuse inserted.
 Go to step 6  .
6 CHECK OIL LEVEL SWITCH. 
  1. Deliberately short circuits by connecting the engine harness connector terminal and chassis ground.
  2. Turn the ignition switch to ON (engine OFF).
  3. Read the current data for engine in the Subaru Select Monitor to confirm the item for "Oil level switch". < Ref. to DISPLAY CURRENT ENGINE DATA , OPERATION, Subaru Select Monitor. >

    Connector & terminal 

    (E130) No. 1 - Chassis ground: 

 Is the "Oil level switch" signal displayed in Subaru Select Monitor HIGH? Replace the oil level switch. < Ref. to REMOVAL , Oil Level Switch. > Go to step 7  .
7 CHECK SECURE CONNECTION OF CONNECTOR BETWEEN ENGINE CONTROL MODULE (ECM) AND ENGINE HARNESS.  Is there any insecure connection? Repair the connection condition. Then, to disable the low engine oil warning display, install the spare fuse at the delivery mode fuse in the main fuse box. Then turn the ignition switch to ON (engine OFF) again to confirm the low engine oil warning is not displayed. Remove the spare fuse installed to finish.
NOTE: The engine oil level switch is normal if the low engine oil level warning is not displayed with the delivery mode fuse inserted.
 Go to step 8  .
8 CHECK ENGINE HARNESS. 
  1. Disconnect the engine control module (ECM) side connector.
  2. Set the ST between the engine control module (ECM) and engine harness. < Ref. to CAUTION , General Description. >
  3. Disconnect the connector between the engine harness and the oil level switch.
  4. Measure the resistance between connector terminals.

    Connector & terminal 

    (B158) No. 3 - (B130) No. 1: 

 Is the resistance less than 1 Ω? Replace the engine control module (ECM). < Ref. to REMOVAL , Engine Control Module (ECM). > Repair or replace the open circuit of engine harness.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.