Dtc U0100 Lost Communication With Ecm / Pcm

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Theft Deterrent Keyless Entry. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

INSPECTION PROCEDURE

CHECK FOR DTC

DTC U0100 Lost Communication with ECM / PCM

DTC U0140 Lost Communication with Main Body ECU

DTC U0142 Lost Communication with Main Body ECU

DTC U0155 Lost Communication with Combination Meter

DTC U1117 Lost Communication with Accessory Gateway


DESCRIPTION

These DTCs are stored when there is a CAN communication error between the certification ECU (smart key ECU assembly) and the ECM, main body ECU (multiplex network body ECU) or combination meter assembly.
HINT:
When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC Code
DTC Detection Condition
Trouble Area
DTC Output Confirmation Operation
U0100
CAN communication error between the certification ECU (smart key ECU assembly) and ECM (1-trip detection*)
ECM
Turn the engine switch on (IG) and wait 10 seconds or more.
U0140
U0142
CAN communication error between the certification ECU (smart key ECU assembly) and main body ECU (1-trip detection*)
Main body ECU (multiplex network body ECU)
Always
U0155
CAN communication error between the certification ECU (smart key ECU assembly) and combination meter assembly (1-trip detection*)
Combination meter assembly
Turn the engine switch on (IG) and wait 10 seconds or more.
U1117
Data from the option connector (bus buffer ECU) cannot be received.
  1. Connector and branch wire of sub bus 2 of option connector (bus buffer ECU)
  2. Internal malfunction of option connector (bus buffer ECU)
Turn the engine switch on (IG) and wait 10 seconds or more.
  1. *: Only detected while a malfunction is present and the engine switch is on (IG)

Vehicle Condition and Fail-safe Function when Malfunction Detected
DTC Code
Vehicle Condition when Malfunction Detected
Fail-safe Function when Malfunction Detected
U0100
There is no effect on vehicle behavior.
If the following conditions are met, it is determined that the malfunction is not in the direct line (NE) but in CAN communication.
  1. When the engine switch is pressed, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking.
  2. When the engine switch is pressed and held, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking.
If the following conditions are met, it is determined that there is a malfunction in both CAN communication and the direct line (NE).
  1. When the engine switch is pressed, the engine stops cranking after 6 seconds.
  2. When the engine switch is pressed and held, the engine remains cranking for up to 30 seconds.
U0140
U0142
Doors cannot be locked or unlocked. The warning (wireless buzzer) does not sound.
-
U0155
The warning (meter buzzer) does not sound and the meter does not indicate a warning.
-
U1117
The engine cannot be started using the wireless remote control function.
-

HINT:

Related Data List and Active Test Items
DTC
Data List Item
Active Test Item
U0100
U0140
U0142
U0155
U1117
-
-

INSPECTION PROCEDURE

NOTICE:
  1. When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus:
    Body Electrical / Entry&Start. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  2. After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.
1.CHECK FOR DTC

  1. Note any DTCs that are output (Click here).

    Result
    Result
    		Proceed to
    NEXT
    		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



B
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

C
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)

D
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)
A

GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) (Click here)