DTC C1203: ECM Communication Circuit Malfunction; DTC C1270: Initialization Incomplete (Test Mode DTC) [09/2014 - 11/2017]: Procedure

1. Check that the proper ECM is installed.

   OK

   Proper ECM is installed.

2. Check if the ECM was replaced before the DTC was stored.

   OK

   ECM was not replaced.

   Result

   Result	Proceed to
   OK	A
   NG (A proper ECM is not installed and/or the ECM was replaced.)	B

Result: 

B 

REPLACE ECM. Refer to  REMOVAL [09/2014 - ] 

Result: 

A 

See step  2

1. Check that a proper skid control ECU (brake actuator assembly) is installed.

   OK

   Proper skid control ECU (brake actuator assembly) is installed.

2. Check if the skid control ECU (brake actuator assembly) had been replaced before the DTC was stored.

   OK

   Skid control ECU (brake actuator assembly) had not been replaced.

   Result

   Result	Proceed to
   OK	A
   NG (The skid control ECU (brake actuator assembly) had been replaced.)	B
   NG (A proper skid control ECU (brake actuator assembly) is not installed.)	C

Result: 

B 

PERFORM ZERO POINT CALIBRATION AND STORE SYSTEM INFORMATION. Refer to  CALIBRATION [09/2014 - 11/2017] 

Result: 

C 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017] 

Result: 

A 

See step  3

1. Clear the system information.

   Refer to CALIBRATION [09/2014 - 11/2017]

2. Store the system information.

   Refer to CALIBRATION [09/2014 - 11/2017]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

   Chassis > ABS/VSC/TRAC > Clear DTCs 

2. Turn the engine switch off.
3. Turn the engine switch on (IG).
4. Check if the same DTC is output.

   Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

   Chassis > ABS/VSC/TRAC > Trouble Codes 

   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 [09/2014 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017] 

Result: 

B 

REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL [09/2014 - 11/2017]