P1631

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1631,U0122-732: Communication Error from HV ECU to Skid Control ECU
U0122-732 - Lost Communication with HV ECU

DESCRIPTION

The hybrid vehicle control ECU 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 hybrid vehicle control ECU 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 hybrid vehicle control ECU, it sends the malfunction signal back to the hybrid vehicle control ECU.





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

(a) Refer to "How to Proceed with Troubleshooting" in the CAN communication system How to Proceed With Troubleshooting.