U0100 / P1631

DTC P1631 COMMUNICATION ERROR FROM ECM TO VSC
DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A"

CIRCUIT DESCRIPTION

DTC Detecting Condition:

The ECM sends signals such as A/T information signal, dynamic laser cruise control operation signal, brake operation demand signal, buzzer operation demand signal and low speed mode signal, etc. to the skid control ECU when the dynamic laser cruise control is in operation.

The ECM is the only component that has a function to record and output the DTCs in the dynamic laser cruise control system. Therefore if the skid control ECU detects a communication error from the ECM, it sends the malfunction signal back to the ECM.

Step 1:

INSPECTION PROCEDURE

HINT: This circuit uses CAN for communication. Therefore, if there are any malfunctions in the communication circuit, one or more DTCs in the CAN communication system is/are output.