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.

WIRING DIAGRAM:

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

Engine type: FA

Fig 1: Engine Start Request Control - Wiring Diagram (Engine Type FA)
Courtesy of SUBARU OF AMERICA, INC.
Engine type: EJ

Fig 2: Engine Start Request Control - Wiring Diagram (Engine Type EJ)

Courtesy of SUBARU OF AMERICA, INC.

Step	Check	Yes	No
1 CHECK LAN SYSTEM. Inspect LAN system. <Ref. to PROCEDURE , Basic Diagnostic Procedure.>	Is the check result OK?	Go to step 2 .	Perform the inspection according to the diagnosis for LAN system.
2 CHECK FUSE. Check the fuse. <Ref. to Relay and Fuse .>	Is the check result OK?	Go to step 3 .	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
3 CHECK HARNESS (OPEN CIRCUIT). Disconnect the Keyless Access Control Module connector and ECM connector. 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?	Go to step 4 .	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?	Go to step 5 .	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?	Go to step 6 .	Repair or replace the short circuit of the harness.
6 CHECK Keyless Access Control Module. Connect the Keyless Access Control Module connector and ECM connector. 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)?	Perform inspection according to the diagnosis of engine. <Ref. to Diagnostics for Engine Starting Failure .> <Ref. to PROCEDURE , Diagnostics for Engine Starting Failure.>	Replace the Keyless Access Control Module. <Ref. to Keyless Access Control Module .>