Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b28a5 engine torque limiter control prohibit

Subaru Legacy BN/BS (2015-2019) Service Manual / Eyesight (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b28a5 engine torque limiter control prohibit

Detected when abnormal data is transmitted from stereo camera to engine control module (ECM) and the engine control module (ECM) prohibits the AT rapid start prevention control, or when the engine control module (ECM) prohibits the AT rapid start prevention control.

DTC DETECTING CONDITION:

• Defective CAN system

• Defective engine control module (ECM)

• Defective stereo camera

• Defective combination meter

• Incorrect assembly of combination meter (when the combination meter that is not for EyeSight is installed.)

TROUBLE SYMPTOM:

• All functions of EyeSight system do not operate.

• EyeSight warning light illuminates.

STEP	CHECK	YES	NO
1.CHECK COMBINATION METER. Check the part number of the combination meter.	Is the combination meter genuine-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A5 ENGINE TORQUE LIMITER CONTROL PROHIBIT	Replace the combination meter. Combination Meter
2.CHECK LAN SYSTEM. Perform the diagnosis for LAN system. Basic Diagnostic Procedure	Is DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A5 ENGINE TORQUE LIMITER CONTROL PROHIBIT
3.CHECK ECM. Perform the diagnosis for the engine. Basic Diagnostic Procedure Basic Diagnostic Procedure	Is DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A5 ENGINE TORQUE LIMITER CONTROL PROHIBIT
4.CHECK CONNECTOR. Check the ECM connector and the stereo camera connector.	Is the connector OK-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A5 ENGINE TORQUE LIMITER CONTROL PROHIBIT	Repair or replace the connector.
5.CHECK STEREO CAMERA. Read the DTC. Diagnostic Code(s) Display	Is another DTC displayed-	Perform the diagnosis according to DTC.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B28A5 ENGINE TORQUE LIMITER CONTROL PROHIBIT
6.CHECK STEREO CAMERA. 1) Clear the memory. Clear Memory Mode 2) Read the DTC again. Diagnostic Code(s) Display	Is the same DTC displayed-	Replace the stereo camera. Stereo Camera > REMOVAL	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, or temporary open or short circuit of harness may be the cause.

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