DTC B2275: Engine Start Request Control Circuit

DTC detecting condition:

When malfunction is detected in engine start permission signal output circuit in the keyless access CONTROL MODULE.
When malfunction is detected in external engine start permission signal circuit.

Trouble symptom:

Engine will not start.

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 FUSE .
Check the fuse. Ref. to SECURITY AND LOCKS>Relay and Fuse

Is the check result OK?

Yes: Go to 3

No: Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
CHECK HARNESS (OPEN CIRCUIT) .
1. Disconnect the keyless access CONTROL MODULE connector and ECM connector.
2. Using a tester, measure the resistance between the keyless access CONTROL MODULE connector and ECM.
  Connector & terminal
  
  Engine type: FA
  
  (B572) No. 7 - (B134) No. 45:
  
  Engine type: EJ
  
  (B572) No. 7 - (B136) No. 16:
Is the resistance less than 1 Ω?

Yes: Go to 4

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

Connector & terminal

(B572) No. 11 - Chassis ground:

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. 7 - Chassis ground:

Is the resistance 10 kΩ or more?

Yes: Go to 6

No: Repair or replace the short circuit of the harness.
CHECK KEYLESS ACCESS CONTROL MODULE .
1. Connect the keyless access CONTROL MODULE connector and ECM connector.
2. Using a tester, measure the voltage between the terminals of keyless access CONTROL MODULE connector.
  Connector & terminal
  
  (B572) No. 7 (+) - (B572) No. 11 (-):
Does the voltage change as 2 V or less → 9 V or more when the push button ignition switch is turned on while depressing the brake pedal with the shift position in P or N (AT model) or while depressing clutch pedal (MT model)?

Yes: Perform inspection according to the diagnosis of engine. Ref. to ENGINE (DIAGNOSTICS) (EXCEPT FOR STI)>Diagnostics for Engine Starting Failure . Ref. to ENGINE (DIAGNOSTICS) (STI)>Diagnostics for Engine Starting Failure>PROCEDURE

No: Replace the keyless access CONTROL MODULE. Ref. to SECURITY AND LOCKS>Keyless Access CONTROL MODULE