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Toyota Tacoma (2015-2018) Service Manual: Lost Communication With Vehicle Dynamics Control Module (U0122)

Toyota Tacoma (2015-2018) Service Manual / Differential / Differential System(w/ Rear Differential Lock) / Lost Communication With Vehicle Dynamics Control Module (U0122)

DESCRIPTION

This DTC is detected if communication is lost with the skid control ECU (brake actuator assembly).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0122

Lost Communication with Vehicle Dynamics Control Module

  • Diagnosis Condition: Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  • Malfunction Status: Communication is lost between skid control ECU and 4 wheel drive control ECU
  • Malfunction Time: 0.72 seconds or more
  • Other: 1 trip detection logic

CAN communication system

CAUTION / NOTICE / HINT

HINT:

  • for 4WD:

    When the data in the skid control ECU (brake actuator assembly) is being overwritten, a message is displayed on the multi-information display and the 4LO indicator light rapidly blinks 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.

    for 2WD:

    When the data in the skid control ECU (brake actuator assembly) is being overwritten, the rear differential lock 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.

  • Clear all DTCs, since DTCs are stored after the data in the skid control ECU (brake actuator assembly) is overwritten.

PROCEDURE

1.

PERFORM DTC

(a) Clear the DTCs (See page (b) Check if the same DTCs are output (See page ).

(b) Check if the same DTCs are output (See page Result ).

Result

Result

Proceed to

DTC is output

A

DTC is not output

B

A

CHECK CAN COMMUNICATION SYSTEM

B

USE SIMULATION METHOD TO CHECK

Lock Switch Circuit
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Differential System(w/o Differential Lock)
Precaution PRECAUTION 1. Before disassembly, clean the outside of the front and rear differential assembly and remove any sand and mud to prevent it from entering the assembly during disassembly ...

Other materials:

Operation Check
OPERATION CHECK 1. NOTICE WHEN CHECKING FOLLOWING (a) Wireless door lock/unlock function: This wireless door lock control function operates only when the following 3 conditions are met: (1) The engine switch is off. (2) All doors are closed. (3) The power door lock control system is operatin ...

Inspection
INSPECTION PROCEDURE 1. INSPECT REAR AXLE SHAFT (a) Using a dial indicator, measure the runout of the shaft and flange. Maximum runout: Shaft runout: 1.5 mm (0.0591 in.) Flange runout: 0.05 mm (0.0020 in.) If the rear axle shaft or flange is damaged or worn, or the runout is greater than ...

System Description
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