DTC C1203: ECM Communication Circuit Malfunction; DTC C1270: Initialization Incomplete (Test Mode DTC): Procedure

1. Check that the part number of the installed ECM is correct.

   OK

   ECM installed in the vehicle has the correct part number.

   Result

   Result	Proceed to
   OK	A
   NG (for 2GR-FSE)	B
   NG (for 4GR-FSE)	C

B → See step   5 

C → See step   7 

A: Go to next step 

1. Clear the system information. Refer to CALIBRATION .
2. Store the system information. Refer to CALIBRATION .

NEXT: Go to next step 

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Check if the same DTC is recorded. Refer to DTC CHECK / CLEAR .

   Result

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

B → See step   6 

A → See step   4