Also With P1631

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1631: Communication Error from ECM to VSC

DTC P1631 - Communication Error from ECM to VSC

DTC U0100 - Lost Communication with ECM / PCM "A"

DESCRIPTION

The ECM sends signals such as A/T information signals, dynamic radar cruise control operation signals, brake operation demand signals, buzzer operation demand signals and low speed mode signals, etc. to the skid control ECU when the dynamic radar cruise control is in operation. The ECM is the only component that has a function to record and output the DTCs in the dynamic radar 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.






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

1. GO TO CAN COMMUNICATION SYSTEM
Refer to how to proceed with troubleshooting How to Proceed With Troubleshooting.