DTC U0047-00 (Electric Brake Booster Control Unit: Without ACC)

DTC U0047-00  : CAN Communication Failure (Ch2 Bus OFF)

NOTE: Before you troubleshoot, review the general troubleshooting information .

DTC (Electric brake booster)

1. Electric brake booster communication check

   -1. Turn the vehicle to the ON mode.

   -2. Check for communication between the electric brake booster and the HDS.

   Is there communication between the electric brake booster and the HDS?

   YES 

   Intermittent failure, the system is OK at this time. Refer to intermittent failures troubleshooting . If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   Go to step 2.

2. Open wire check (F-CAN B_H, F-CAN B_L lines)

   -1. Turn the vehicle to the OFF (LOCK) mode with driver's door open.

   -2. Jump the SCS line with the HDS, and wait more than 1 minute.

   -3. Wait for 3 minutes.

   NOTE:  Do not close the driver's door.

   -4. Disconnect the following connectors.

   Electric brake booster 26P connector

   PCM connector A (50P)

   -5. Check for continuity between test points 1 and 2.

   Test condition

   Vehicle OFF (LOCK) mode

   	Electric brake booster 26P connector: disconnected
   	PCM connector A (50P): disconnected
   Test point 1	Electric brake booster 26P connector No. 19
   Test point 2	PCM connector A (50P) No. 39

   Test point 1	Electric brake booster 26P connector No. 12
   Test point 2	PCM connector A (50P) No. 38

   Is there continuity?

   YES 

   The F-CAN B_H and F-CAN B_L wires are OK. Check for loose terminals and poor connections in the electric brake booster 26P connector. Check for any authorized service information related to the DTCs or symptoms you are troubleshooting. If they are OK, replace the electric brake booster .

   NO 

   Repair an open in the wire between the electric brake booster and the PCM.