Toyota RAV4 manuals

Toyota Sienna Service Manual: Communication Error from Distance Control ECU to ECM

DTC P1615 Communication Error from Distance Control ECU to ECM

DTC U1101 Lost Communication with Distance Control ECU

DESCRIPTION

The distance control ECU receives information about the area in front of the vehicle from the laser sensor and then sends a brake control demand signal (deceleration demand) and diagnosis signals, such as laser sensor grime signals or laser sensor malfunction signals, to the ECM.

DTC No.

DTC Detection Condition

Trouble Area

P1615

While the dynamic laser cruise control is either preparing for operation or operating, if communication data from the distance control ECU is logically inconsistent for a certain amount of time, the ECM records this logical error code
  • Communication circuit
  •  Distance control ECU
  •  ECM

U1101

While the dynamic laser cruise control is either preparing for operation or operating, if communication data from the distance control ECU is invalid for a certain amount of time, the ECM records this communication cut off code
  • Communication circuit
  •  Distance control ECU
  •  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

END

Brake System Malfunction
DTC P1578 Brake System Malfunction DESCRIPTION This DTC is output when the VSC system has a problem. Check the VSC system when this DTC is output DTC No. DTC Detection Conditio ...

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 sig ...

Other materials:

Driving in vehicle-to-vehicle distance control mode
This mode employs a radar sensor to detect the presence of vehicles up to approximately 400 ft. (120 m) ahead, determines the current vehicle-to-vehicle following distance, and operates to maintain a suitable following distance from the vehicle ahead. Note that vehicle-to-vehicle distance will ...

Diagnosis system
1. CHECK DLC3  The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. NOTICE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do ...

DTC check / clear
1. DTC CHECK  Connect the intelligent tester to the DLC3.  Connect the intelligent tester to the Controller Area Network Vehicle Interface Module (CAN VIM). Then connect the CAN VIM to the Data Link Connector 3 (DLC3).  Turn the ignition switch to the ON posi ...

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