Also With P1616

CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: P1616: Communication Error from ECM to Distance Control ECU

DTC P1616 - Communication Error from ECM to Distance Control ECU

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

DESCRIPTION

The ECM receives signals from each sensor and ECU, then sends signals such as A/T signals, cruise control operation signals, low speed operation signals, brake control operation signals, and radar light emission prohibiting signals, to the distance control ECU. 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 distance control ECU detects a communication error from the ECM, it sends a 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. CHECK CAN COMMUNICATION SYSTEM
Refer to HOW TO PROCEED WITH TROUBLESHOOTING How to Proceed With Troubleshooting.