DTC C1203: ECM Communication Circuit [02/2019 - 12/2021]: Description

This circuit is used to send TRC (TRAC) and VSC information from the skid control ECU (brake booster with master cylinder assembly) to the hybrid vehicle control ECU assembly, and hybrid control system information from the hybrid vehicle control ECU assembly to the skid control ECU (brake booster with master cylinder assembly) via CAN communication.

Identification information sent from other ECUs is stored when the vehicle is shipped from the factory and used as the default values.

NOTE:

DTC C1203 is output when an incorrect ECU is installed. If initialization is performed and learning occurs with an incorrect ECU installed, operations and functions will differ from those stored when the vehicle was shipped from the factory. Therefore, make sure that learning occurs properly.

DTC No.	Detection Item	INF Code	DTC Detection Condition	Trouble Area	Note
C1203	ECM Communication Circuit	-	Either of the following is detected: Identification information sent from other ECUs does not match with the value stored when shipped from the factory. No stored information for destination.	The wrong ECU or sensor was installed Skid control ECU (Brake booster with master cylinder assembly)	-

DTC DETECTION CONDITIONS: C1203

		Vehicle Condition
		Pattern 1	Pattern 2
Diagnosis Condition	-	-	-
Malfunction Status	Identification information sent from other ECUs does not match with the value stored when shipped from the factory	◦	-
Malfunction Status	No stored information for destination	-	◦
Detection Time		-	-
Number of Trips		1 trip	1 trip

HINT:

DTC will be output when conditions for either of the patterns in the table above are met.