DTC C1203: ECM Communication Circuit Malfunction [08/2015 - 08/2019]: Procedure

1. Check that the proper ECM is installed.
   RESULT
   
   

   Result	Proceed to
   Proper ECM is installed	A
   Proper ECM is not installed	B

Result: 

B 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

A 

See step  2

1. Check if the brake actuator assembly had been replaced before the DTC was recorded.
   RESULT
   
   

   Result	Proceed to
   The brake actuator assembly was not replaced	A
   The brake actuator assembly was replaced	B

Result: 

B 

See step  4

Result: 

A 

See step  3

1. Clear the DTC (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
2. Check if the same DTC is recorded (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1203 is not output	A
   DTC C1203 is output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2019] )

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )

1. Perform initialization and calibration (Refer to CALIBRATION [08/2015 - 08/2019] ).

Result: 

NEXT 

See step  5

1. Clear the DTC (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
2. Check if the same DTC is recorded (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
   RESULT
   
   

   Result	Proceed to
   DTC C1203 is not output	A
   DTC C1203 is output	B

Result: 

A 

END 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY 

(Refer to REMOVAL [08/2015 - 08/2019] )