Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM1000000018WSO
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: U010087,U010487,U012287; Lost Communication With ECM/PCM "A" Missing Message; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

U010087

Lost Communication With ECM/PCM "A" Missing Message

DTC

U010487

Lost Communication with Cruise Control Module Missing Message

DTC

U012287

Lost Communication with Vehicle Dynamics Control Module Missing Message

DESCRIPTION

The ECM communicates with each sensor and ECU via CAN communication.

If any malfunction is detected in a CAN communication circuit, one or more CAN communication system DTCs are stored.

DTC No.

DTC Detection Condition

Trouble Area

MIL

U010087

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, the ECM continuously receives a communication cut-off signal from the skid control ECU (brake actuator assembly) for approximately 1 second or more.

  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

Does not come on

U010487

While the vehicle speed is 36 km/h (22 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and ECM is detected for 1 second or more.

  • CAN communication system
  • ECM
  • Driving support ECU assembly

Does not come on

U012287

When the ignition switch is ON and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (brake actuator assembly) and the ECM is detected for approximately 2.6 seconds or more.

  • CAN communication system
  • ECM
  • Skid control ECU (brake actuator assembly)

Does not come on

CAUTION / NOTICE / HINT

NOTICE:

  • When the millimeter wave radar sensor is replaced with a new one, adjustment of the radar sensor beam axis must be performed (See page 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: MILLIMETER WAVE RADAR SENSOR: ADJUSTMENT ).
  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1.

CHECK FOR DTCs

(a) Clear the DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR

(b) Perform the following to make sure that the DTC detection conditions are met.

HINT:

If the following conditions are not met, the system cannot detect the malfunction.

  1. Turn the ignition switch to ON.
  2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON-OFF button).
  3. Drive the vehicle at 36 km/h (22 mph) or more for 5 seconds or more.

(c) Check for DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; CRUISE CONTROL: DYNAMIC RADAR CRUISE CONTROL SYSTEM: DTC CHECK / CLEAR

Result

Proceed to

DTC U010087, U010487 and U012287 are not output

A

DTC U010087, U010487 or U012287 is output

B

A

USE SIMULATION METHOD TO CHECK

B

GO TO CAN COMMUNICATION SYSTEM