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.

Wiring diagram: 

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

• Non-turbo model

  Courtesy of SUBARU OF AMERICA, INC.

• Turbo model

  Courtesy of SUBARU OF AMERICA, INC.

  CAUTION: For replacement procedure of keyless access Control Module, refer to the "REGISTRATION MANUAL FOR IMMOBILIZER" provided as a separate volume.

1. 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.

2. 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.

3. 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

      Non-turbo model

      (B572) No. 7 - (B134) No. 46:

      Turbo model

      (B572) No. 7 - (B134) No. 45:

   Is the resistance less than 1 Ω

   Yes: Go to  4.

   No: Repair or replace the open circuit of harness.

4. 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.

5. 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.

6. 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 (-):

   Is the voltage 2 V or less → 9 V or more, when the push button ignition switch is turned on while depressing the brake pedal (AT model) or clutch pedal (MT model) with the shift position in P or N and the key placed in the passenger room?

   Yes: Perform inspection according to the diagnosis of engine. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE . Ref. to ENGINE (DIAGNOSTICS) (H4DOTC)>BASIC DIAGNOSTIC PROCEDURE .

   No: Replace the keyless access Control Module. Ref. to SECURITY AND LOCKS>Keyless Access Control Module>REMOVAL .