Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b2275 engine start request control circuit

Subaru Legacy BN/BS (2015-2019) Service Manual / Keyless access with push button start system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / 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 CM.

• When malfunction is detected in external engine start permission signal circuit.

TROUBLE SYMPTOM:

Engine will not start.

CAUTION:

For replacement procedure of keyless access CM, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

WIRING DIAGRAM:

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

Keyless access with push button start system Keyless Access With Push Button Start System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK LAN SYSTEM. Inspect LAN system. Basic Diagnostic Procedure > PROCEDURE	Is LAN system normal-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT	Perform the inspection according to the diagnosis for LAN system.
2.CHECK FUSE. Remove the fuse. Relay and Fuse > INSPECTION	Is the fuse OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT	Replace the fuse. When the replaced fuse is blown immediately, check the power supply circuit for short-circuited.
3.CHECK HARNESS. 1) Disconnect the keyless access CM connector and ECM connector. 2) Using a tester, measure the resistance between the keyless access CM connector and ECM. Connector & terminal (i241) No. 35 — (B134) No. 46:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT	Repair or replace the open circuit of harness.
4.CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i241) No. 21 — Chassis ground: (i75) No. 1 — Chassis ground:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT	Repair or replace the open circuit of harness.
5.CHECK HARNESS. Using a tester, measure the resistance between the keyless access CM connector and chassis ground. Connector & terminal (i241) No. 35 — Chassis ground:	Is the resistance 10 k- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT	Repair or replace the short circuit of the harness.
6.CHECK KEYLESS ACCESS CM. 1) Connect the keyless access CM connector and ECM connector. 2) Place the access key in the passenger room. 3) Using a tester, measure the voltage between the terminals of keyless access CM connector. Connector & terminal (i241) No. 35 (+) — (i241) No. 21 (−):	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. Diagnostics for Engine Starting Failure > PROCEDURE Diagnostics for Engine Starting Failure > PROCEDURE	Replace the keyless access CM. Keyless Access CM

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Other materials:

Removal
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