DTC C1203: ECM Communication Circuit Malfunction; DTC C1270: Initialization Incomplete (Test Mode DTC) [10/2015 - 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 (w/ VGRS System)	A
   OK (w/o VGRS System)	B
   NG (A proper ECM is not installed and/or the ECM was replaced.)	C

Result: 

B 

See step  4

Result: 

C 

REPLACE ECM 

for 2GR-FSE: Refer to REMOVAL [09/2014 - 11/2017]

for 8AR-FTS: Refer to REMOVAL [10/2015 - ]

Result: 

A 

See step  2

1. Check that a proper front steering control ECU is installed.

   OK

   Proper front steering control ECU is installed.

2. Check if the front steering control ECU had been replaced before the DTC was stored.

   OK

   Front steering control ECU had not been replaced.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT STEERING CONTROL ECU. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  3

1. w/ DRS System:

   Check that a correct rear steering control ECU is installed.

   w/o DRS System:

   Check that the rear steering control ECU is not installed.

   OK

   The rear steering control ECU is installed according to the vehicle specifications.

2. Check if the rear steering control ECU had been replaced before the DTC was stored.

   OK

   Rear steering control ECU had not been replaced.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE REAR STEERING CONTROL ECU. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  4

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  5

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  6

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 [10/2015 - 11/2017] 

Result: 

B 

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