Dtc U0100 Lost Communication With Ecm / Pcm A

Drivetrain. Land Cruiser. Urj200, 202 Grj200 Vdj200
Jf2A Transfer 4Wd Awd. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

RECONFIRM DTC

DTC U0100 Lost Communication with ECM / PCM "A"

DTC U0122 Lost Communication with Vehicle Dynamics Control Module


DESCRIPTION

This DTC is output when communication is lost with the skid control ECU (master cylinder solenoid) or ECM.

DTC No.
DTC Detection Condition
  1. Diagnosis Condition
  2. Malfunction Status
  3. Malfunction Time
  4. Other
Trouble Area
U0100
  1. Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  2. Communication is lost between ECM and 4 wheel drive control ECU
  3. 5.12 seconds or more when transfer is switching between high and low
  4. 1 trip detection logic
CAN communication system
U0122
  1. Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  2. Communication is lost between skid control ECU and 4 wheel drive control ECU
  3. 0.72 seconds or more when transfer is switching between high and low, or when center differential is switching between free and lock
  4. 1 trip detection logic
CAN communication system

INSPECTION PROCEDURE

NOTICE:
  1. When the data in the ECM or skid control ECU (master cylinder solenoid) is being overwritten, the indicator light may rapidly blink due to the 4 wheel drive control ECU detecting a communication malfunction (blinks at 0.25 second intervals (0.25 seconds on and 0.25 seconds off)), but this is not a malfunction.
  2. Clear all DTCs, since DTCs are stored after the data in the ECM or skid control ECU (master cylinder solenoid) is overwritten.
1.RECONFIRM DTC

  1. Clear the DTCs (Click here).

  1. Check if the same DTCs are output (Click here).

    Result
    Result
    		Proceed to
    DTCs are output
    		for LHD with Central Gateway ECU
    		A
    for LHD without Central Gateway ECU
    		B
    for RHD with Central Gateway ECU
    		C
    for RHD without Central Gateway ECU
    		D
    DTCs are not output
    		E



B
CHECK CAN COMMUNICATION SYSTEM (Click here)

C
CHECK CAN COMMUNICATION SYSTEM (Click here)

D
CHECK CAN COMMUNICATION SYSTEM (Click here)

E
USE SIMULATION METHOD TO CHECK (Click here)
A

CHECK CAN COMMUNICATION SYSTEM (Click here)