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Toyota Sienna Service Manual: 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 laser 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 laser 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.

DTC No.

DTC Detection Condition

Trouble Area

P1616

While the dynamic laser cruise control is either preparing for operation or operating, if the ECM continuously receives a logical error signal from the distance control ECU for more than a specific amount of time, the ECM records this logical error code
  • Communication circuit
  •  ECM
  •  Distance control ECU

U0100

While the dynamic laser cruise control is either preparing for operation or operating, if the ECM continuously receives a communication cut off signal from the distance control ECU for more than a specific amount of time, the ECM records this communication cut off code
  • Communication circuit
  •  ECM
  •  Distance 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 CHECK CAN COMMUNICATION SYSTEM

Refer to HOW TO PROCEED WITH TROUBLESHOOTING

END

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