DTC P1631: Communication Error from ECM to VSC [12/2013 - 11/2016]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Refer to DIAGNOSIS SYSTEM [12/2013 - 11/2016]

   Result

   Result	Proceed to
   CAN communication system DTCs are not output	OK
   CAN communication system DTCs are output	NG

Result:  2

NG 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016] 

Result:  1

OK 

See step  2

1. Replace the ECM with a new one.

   Refer to COMPONENTS [12/2013 - 11/2016]

Result: 

NEXT 

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2013 - 11/2016]

4. Perform the following to make sure that the DTC detection conditions are met.

   HINT: 

   If the detection conditions are not met, the malfunction cannot be detected.

   1. Drive the vehicle at a speed for which cruise control operation is possible.
   2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
5. Enter the following menus: Powertrain / Radar Cruise / Trouble Codes.
6. Check for DTCs.

   Powertrain > Radar Cruise > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTC P1631 is output	B

7. Turn the engine switch off.

Result:  1

A 

END 

Result:  2

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [12/2013 - 11/2016]