Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM (U0100,U0142,U0155)



DTC Detecting Condition

Trouble Area


No communication with ECM

  • CAN communication system
  • ECM


No communication with main body ECU

  • CAN communication system
  • Main body ECU (multiplex network body ECU)


No communication with combination meter

  • CAN communication system
  • Combination meter assembly





Refer to CAN Communication System (See page ). ).



Air Inlet Damper Position Sensor Circuit (B1432/32)
DESCRIPTION This sensor detects the position of the air inlet damper and sends the appropriate signals to the air conditioning amplifier assembly. The position sensor is built into the No. 1 air ...

Air Outlet Damper Control Servo Motor Circuit (B1443/43)
DESCRIPTION This No. 1 air conditioning radiator damper servo sub-assembly (for mode switching) is controlled by the air conditioning amplifier assembly and moves the mode damper to the desired p ...

Other materials:

Evaporator Temperature Sensor Circuit (B1413/13)
DESCRIPTION The cooler thermistor sensor (evaporator temperature sensor) is installed on the evaporator in the air conditioner unit to detect the temperature of the cooled air that has passed through the evaporator and is used to control the air conditioning. It sends signals to the air condi ...

Theft Deterrent System cannot be Set or Unset
DESCRIPTION When the ignition switch is turned off and all doors and the engine hood are closed, the theft deterrent system is set when doors are locked by wireless operation*1, key linked operation or entry operation*2. If all doors are closed but engine hood is open when doors are locked by ...

System Voltage Circuit Short to Ground or Open (P056014)
DESCRIPTION The battery supplies power to the ECM even when the ignition switch is off. This power allows the ECM to store data such as DTC history, freeze frame data and fuel trim values. If the battery voltage falls below a minimum level, the ECM data is cleared and the ECM determines that ...

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