Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Lost Communication with ECM / PCM "A" (U0100,U0122)

Toyota Tacoma 2015-2018 Service Manual / Vf2cm Transfer / Touch Select 2-4 And High-low System / Lost Communication with ECM / PCM "A" (U0100,U0122)

DESCRIPTION

This DTC is output when communication is lost with the skid control ECU (brake actuator assembly) or ECM.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0100

Lost Communication with ECM / PCM "A"

  • Diagnosis Condition: Ignition switch turned to ON (3 seconds elapse after ignition switch is turned to ON)
  • Malfunction Status: Communication is lost between ECM and 4 wheel drive control ECU
  • Malfunction Time: 1.85 seconds or more
  • Other: 1 trip detection logic

CAN communication system

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

NOTICE:

  • When the data in the ECM and skid control ECU (brake actuator assembly) is being overwritten, a message is displayed on the multi-information display and the 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.
  • Clear all DTCs, since DTCs are stored after the data in the ECM or 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

Clutch Switch Circuit
DESCRIPTION While depressing the clutch pedal, the clutch start switch assembly sends a signal to terminal MTN of the 4 wheel drive control ECU. While the signal is input, switching between H4 an ...

4WD Control Switch Circuit
WIRING DIAGRAM PROCEDURE 1. CONFIRM PROBLEM SYMPTOM (a) Confirm the problem symptoms. Result Result Proceed to The 4WD ind ...

Other materials:

Reassembly
REASSEMBLY PROCEDURE 1. INSTALL FRONT AXLE HUB OIL SEAL (a) Using a brass bar and a hammer, install a new front axle hub oil seal. NOTICE: Do not damage the oil seal. 2. INSTALL FRONT AXLE WITH ABS ROTOR BEARING ASSEMBLY (a) Using SST and a press, install a new bearing onto the front axle ...

Clearance Warning ECU Communication Stop Mode
DESCRIPTION Detection Item Symptom Trouble Area Clearance Warning ECU Communication Stop Mode Either Condition is met: Communication stop for "Clearance Warning (Intuitive Parking Assist1)" is indicated on th ...

Rear Differential Lock Control SW Stuck ON (P17CC)
DESCRIPTION This DTC is output when a malfunction of the differential lock switch is detected. DTC No. Detection Item DTC Detection Condition Trouble Area P17CC Rear Differential Lock Control SW Stuck ON ...

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