Dtc U0100 Lost Communication With Ecm / Pcm A

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
Cruise Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTCs

DTC U0100 Lost Communication with ECM / PCM "A"

DTC U0122 Lost Communication with Vehicle Dynamics Control Module

DTC U0125 Lost Communication with Yaw Rate Sensor Module

DTC U0126 Lost Communication with Steering Angle Sensor Module

DTC U0129 Lost Communication with Brake System Control Module

DTC U0235 Lost Communication with Cruise Control Front Distance Range Sensor

DTC U1104 Lost Communication with Driving Support ECU


DESCRIPTION

The ECM and driving support ECU assembly communicate signals with each sensor and ECU via CAN communication.
If there are any malfunctions in the communication circuit, one or more CAN communication system DTCs are output.

DTC No.
DTC Detection Condition
Trouble Area
U0100
While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the ECM and the driving support ECU assembly is detected for approximately 1 second or more.
  1. CAN communication system
  2. ECM
  3. Driving support ECU assembly
U0122
When the engine switch is on (IG) and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (master cylinder solenoid) and the ECM is detected for approximately 2.24 seconds or more.
  1. CAN communication system
  2. Skid control ECU (master cylinder solenoid)
  3. ECM
U0125
While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the yaw rate sensor and the driving support ECU assembly is detected for approximately 1 second or more.
  1. CAN communication system
  2. Yaw rate sensor (airbag sensor assembly)
  3. Driving support ECU assembly
U0126
While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the steering sensor and the driving support ECU assembly is detected for approximately 1 second or more.
  1. CAN communication system
  2. Steering sensor
  3. Driving support ECU assembly
U0129
While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the skid control ECU (master cylinder solenoid) and the driving support ECU assembly is detected for approximately 2.5 seconds or more.
  1. CAN communication system
  2. Skid control ECU (master cylinder solenoid)
  3. Driving support ECU assembly
U0235
While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the millimeter wave radar sensor assembly and the driving support ECU assembly is detected for approximately 1 second.
  1. CAN communication system
  2. Millimeter wave radar sensor assembly
  3. Driving support ECU assembly
U1104
Condition 1:
  1. While the vehicle speed is 5 km/h (3 mph) or more and the dynamic radar cruise control system is operating, a communication error between the driving support ECU assembly and the millimeter wave radar sensor assembly is detected for approximately 1 second.
Condition 2:
  1. While the vehicle speed is 5 km/h (3 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.
Condition 1:
  1. CAN communication system
  2. Millimeter wave radar sensor assembly
  3. Driving support ECU assembly
Condition 2:
  1. CAN communication system
  2. ECM
  3. Driving support ECU assembly

INSPECTION PROCEDURE

1.CHECK FOR DTCs

  1. Connect the GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Clear the DTCs (Click here).

  1. Make sure that the DTC detection conditions are met.

    HINT:
    If the detection conditions are not met, the system cannot detect the malfunction.
    1. Turn the engine switch on (IG).
    2. Turn the dynamic radar cruise control system on using the cruise control main switch (ON/OFF).
    3. Drive the vehicle at 5 km/h (3 mph) or more for 5 second or more.

  1. Check for DTCs (Click here).

    Result:

    Result
    		Proceed to
    DTC U0100, U0122, U0125, U0126, U0129, U0235 and U1104 are not output
    		A
    DTC U0100, U0122, U0125, U0126, U0129, U0235 or U1104 is output (for LHD)
    		B
    DTC U0100, U0122, U0125, U0126, U0129, U0235 or U1104 is output (for RHD)
    		C


B
GO TO CAN COMMUNICATION SYSTEM (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (Click here)
A

USE SIMULATION METHOD TO CHECK (Click here)