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.

1. CHECK COMBINATION METER  .

   Check the part number of the combination meter.

   Is the combination meter genuine?

   Yes  : Go to  2 .

   No  : Replace the combination meter. Ref. to INSTRUMENTATION/DRIVER INFO>COMBINATION METER .

2. CHECK LAN SYSTEM  .

   Perform the diagnosis for LAN system. Ref. to LAN SYSTEM (DIAGNOSTICS)>BASIC DIAGNOSTIC PROCEDURE .

   Is the check result OK?

   Yes  : Go to  3 .

   No  : Perform the diagnosis for LAN system.

3. CHECK ECM  .

   Perform the diagnosis for the engine. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .

   Is the check result OK?

   Yes  : Go to  4 .

   No  : Perform the diagnosis for the engine.

4. CHECK CONNECTOR  .

   Check the ECM connector and the stereo camera connector.

   Is the check result OK?

   Yes  : Go to  5 .

   No  : Repair or replace the connector.

5. CHECK STEREO CAMERA  .

   Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

   Is any DTC other than DTC B28A5 displayed? (Current malfunction)

   Yes  : Perform the diagnosis of DTCs other than B28A5.

   No  : Go to  6 .

6. CHECK STEREO CAMERA  .
   1. Using the Subaru Select Monitor, perform the clear memory of [EyeSight]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
   2. Read the DTC of [EyeSight] using the Subaru Select Monitor. Ref. to EYESIGHT (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

      Is DTC B28A5 displayed? (Current malfunction)

      Yes  : Replace the stereo camera. Ref. to EYESIGHT>STEREO CAMERA .

      No  : 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, temporary open or short circuit of harness may be the cause.