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Home >> Toyota >> 2019 >> Yaris LE >> Repair and Diagnosis (Single Page) >> Electrical >> Gauges >> Clock System - Diagnostic Codes (2 Of 2) & Symptom Tests >> Clock System >> DTC U0001-88: High Speed CAN Communication Bus bus off; DTC U0100-00: Lost Communication With ECM/PCM "A"; DTC U0101-00: Lost Communication with TCM; DTC U0121-00: Lost Communication With Anti-Lock Brake System (ABS) Control Module; DTC U0151-00: Lost Communication With Restraints Control Module; DTC U0155-00: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0214-00: Lost Communication With Remote Function Actuation [07/2015 - ] >> Contents
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DTC U0001-88: High Speed CAN Communication Bus bus off; DTC U0100-00: Lost Communication With ECM/PCM "A"; DTC U0101-00: Lost Communication with TCM; DTC U0121-00: Lost Communication With Anti-Lock Brake System (ABS) Control Module; DTC U0151-00: Lost Communication With Restraints Control Module; DTC U0155-00: Lost Communication With Instrument Panel Cluster (IPC) Control Module; DTC U0214-00: Lost Communication With Remote Function Actuation [07/2015 - ]: Contents

DTC No. Detection Item DTC Detection Condition Warning Indicate Memory Fail-safe Operation Note
U0001-88 High Speed CAN Communication Bus bus off Module communication error (HS-CAN) Not applicable DTC Stored Applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0100-00 Lost Communication With ECM/PCM "A" Communication error with ECM Not applicable DTC Stored Applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0101-00 Lost Communication with TCM Communication error with TCM Not applicable DTC Stored Not applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0121-00 Lost Communication With Anti-Lock Brake System (ABS) Control Module Communication error with brake actuator Not applicable DTC Stored Not applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0151-00 Lost Communication With Restraints Control Module Communication error with center airbag sensor assembly Not applicable DTC Stored Not applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0155-00 Lost Communication With Instrument Panel Cluster (IPC) Control Module Communication error with combination meter Not applicable DTC Stored Applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
U0214-00 Lost Communication With Remote Function Actuation Communication error with engine stop and start ECU Not applicable DTC Stored Applicable
  • Drive cycle: Not applicable
  • Self test type: CM DTC self test, OD DTC self test
DTC Detection Condition U0001-88 
  • Module communication error (HS-CAN)

U0100-00 
  • Communication error with ECM

U0101-00 
  • Communication error with TCM

U0121-00 
  • Communication error with brake actuator

U0151-00 
  • Communication error with center airbag sensor assembly

U0155-00 
  • Communication error with combination meter

U0214-00 
  • Communication error with engine stop and start ECU
U0001-88 
  • Main body ECU detects the CAN bus communication line (HS-CAN) malfunction 10 times continuously with the ignition switched ON (engine off or on).

U0100-00 
  • Main body ECU could not receive the CAN signal from the ECM for 5 s or more with the ignition switched ON (engine off or on).

U0101-00 
  • Main body ECU could not receive the CAN signal from the TCM for 5 s or more with the ignition switched ON (engine off or on).

U0121-00 
  • Main body ECU could not receive the CAN signal from the brake actuator for 5 s or more with the ignition switched ON (engine off or on).

U0151-00 
  • Main body ECU could not receive the CAN signal from the center airbag sensor assembly for 5 s or more with the ignition switched ON (engine off or on).

U0155-00 
  • Main body ECU could not receive the CAN signal from the combination meter for 5 s or more with the ignition switched ON (engine off or on).

U0214-00 
  • Main body ECU could not receive the CAN signal from the engine stop and start ECU for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe Operation U0001-88 
  • Exterior lighting system
    • Turn the TNS (Parking Lights) and headlights LO on, and turn off other exterior light controls.
  • Interior light control system
    • Continue the controls prior to the interior light malfunction detection for 5 s and turn the light on using the initial value after 5 s have elapsed.
  • Front washer system
    • Stop the front washer control.
  • Blower system
    • Main body ECU power supply condition is on: Turn the blower relay on.
    • Main body ECU power supply condition is off: Turn the blower relay off.

U0100-00 
  • Not applicable

U0101-00 
  • Not applicable

U0121-00 
  • Not applicable

U0151-00 
  • Not applicable

U0155-00 
  • Interior light control system
    • Continue the controls prior to the interior light malfunction detection for 5 s and turn the light on using the initial value after 5 s have elapsed.
  • Blower system
    • Main body ECU power supply condition is on: Turn the blower relay on.
    • Main body ECU power supply condition is off: Turn the blower relay off.

U0214-00 
  • Exterior lighting system
    • Turn the TNS (Parking Lights) and headlights LO on, and turn off other exterior light controls.
  • Windshield wiper system
    • Continue the controls prior to the windshield wiper malfunction detection.
  • Front washer system
    • Stop the front washer control.
Trouble Area
  • Malfunction in CAN bus communication line
  • Malfunction in CAN line between ECM and main body ECU
  • Malfunction in CAN line between TCM and main body ECU
  • Malfunction in CAN line between brake actuator and main body ECU
  • Malfunction in CAN line between center airbag sensor assembly and main body ECU
  • Malfunction in CAN line between combination meter and main body ECU
  • Malfunction in CAN line between engine stop and start ECU and main body ECU