DTC B2286: Engine Speed Signal(Without Auto Start Stop)

DTC detecting condition:

When the engine speed signal transmitted from the ECM via solid line and the engine speed signal transmitted from the ECM via CAN communication line do not match.

Trouble symptom:

Cannot start the engine, or the engine stops after starting.

CAUTION: For replacement procedure of keyless access CONTROL MODULE, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume. Contact an Authorized Subaru Dealership.

Wiring diagram:

Push button start system Ref. to WIRING SYSTEM>Push Button Start System>WIRING DIAGRAM

Engine type: FA

Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Courtesy of SUBARU OF AMERICA, INC.

CHECK LAN SYSTEM .
Inspect LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>Basic Diagnostic Procedure>PROCEDURE

Is the check result OK?

Yes: Go to 2

No: Perform the inspection according to the diagnosis for LAN system.
CHECK COMBINATION METER .
Confirm that the speedometer is displayed normally.

Is the check result OK?

Yes: Go to 3

No: Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Basic Diagnostic Procedure>PROCEDURE . Ref. to ENGINE (DIAGNOSTICS) (STI)>Basic Diagnostic Procedure>PROCEDURE
CHECK CURRENT DATA .
Check the current data display of «Keyless Access with Push Button Start» using Subaru Select Monitor. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)>Read Current Data
- Engine speed
Can the data be read normally?

Yes: Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

No: Go to 4
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the keyless access CONTROL MODULE connector.
2. Disconnect the ECM connector.
3. Using a tester, measure the resistance between the keyless access CONTROL MODULE connector and ECM connector.
  Connector & terminal
  
  Engine type: FA
  
  (B572) No. 17 - (B134) No. 4:
  
  Engine type: EJ
  
  (B572) No. 17 - (B135) No. 15:
Is the resistance less than 1 Ω?

Yes: Go to 5

No: Repair or replace the open circuit of harness.
CHECK HARNESS (GROUND SHORT CIRCUIT) .
Using a tester, measure the resistance between the keyless access CONTROL MODULE connector and chassis ground.

Connector & terminal

(B572) No. 17 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes: Go to 6

No: Repair or replace the short circuit of the harness.
CHECK HARNESS .
1. Connect the keyless access CONTROL MODULE connector and ECM connector.
2. Using the Subaru Select Monitor, measure the waveform between the keyless access CONTROL MODULE connector and chassis ground.
  Connector & terminal
  
  (B572) No. 17 - Chassis ground:
Does the pulse stop when the engine is stopped, and does the pulse generate when the engine is started?

Yes: Replace the keyless access CONTROL MODULE. Ref. to SECURITY AND LOCKS>Keyless Access CONTROL MODULE

No: Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Diagnostics for Engine Starting Failure>PROCEDURE . Ref. to ENGINE (DIAGNOSTICS) (STI)>Diagnostics for Engine Starting Failure>PROCEDURE