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
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Communication Error from ECM to Distance Control ECU
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Other materials:

Concept, General information, Safety information
Concept Using this system, a desired speed and a distance to a vehicle ahead can be adjusted using the buttons on the steering wheel. The system maintains the desired speed on clear roads. For this purpose, the vehicle accelerates or brakes automatically. If a vehicle is driving ahead of you, the ...

How to proceed with troubleshooting
1 VEHICLE BROUGHT INTO A WORKSHOP 2 DIAGNOSTIC QUESTIONING AND SYMPTOM CONFIRMATION Ask the customer about symptoms and confirm malfunctions. 3 CONFIRM THE SYSTEM NORMAL CONDITION 4 CHECK DTC HINT: If the system cannot enter the diagnosis mode, inspect each AVC-LAN communication signal ...

Removal
HINT: Remove the RH side by the same procedure as the LH side. 1. REMOVE FRONT WHEEL 2. DRAIN BRAKE FLUID NOTICE: Wash the brake fluid off immediately if it attaches to any painted surface. 3. REMOVE FRONT DISC BRAKE CYLINDER SUBASSEMBLY (a) Remove the union bolt and 2 gaskets from the f ...

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