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Home >> Mazda >> 2022 >> MX-5 Miata RF Club >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> On-Board Diagnostics - Electric Vacuum Pump (EVP) >> DTC U0001-88/U0100-00/U0100-08/U0121-00/U0121-02/U0121-87/U0155-00: Can Communication - Communication Error [EVP Control Unit] >> Notes

DTC U0001-88/U0100-00/U0100-08/U0121-00/U0121-02/U0121-87/U0155-00: Can Communication - Communication Error [EVP Control Unit]: Notes

DTC U0001-88/U0100-00/U0100-08/U0121-00/U0121-02/U0121-87/U0155-00: (EVP CONTROL UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0001:88 CAN communication: module communication error
U0100:00 CAN communication: communication error to PCM
U0100:08
U0121:00 CAN communication: communication error to DSC HU/CM
U0121:02
U0121:87
U0155:00 CAN communication: communication error to instrument cluster
DETECTION CONDITION
  • DTC U0001:88
    • Open or short circuit in CAN system wiring harness for a continuous 1.4 s.
  • DTC U0100:00
    • Engine speed signal via CAN communication cannot be received from the PCM for a continuous 5 s.
  • DTC U0100:08
    • Vacuum sensor 2 signal via CAN communication cannot be received from the PCM for a continuous 5 s.
  • DTC U0121:00
    • CAN communication from the DSC HU/CM is interrupted for a continuous 5 s.
  • DTC U0121:02
    • Brake fluid pressure signal via CAN communication cannot be received from the PCM for a continuous 5 s.
  • DTC U0121:87
    • Vehicle speed signal via CAN communication cannot be received from the DSC HU/CM for a continuous 5 s.
  • DTC U0155:00
    • CAN communication from the instrument cluster is interrupted for a continuous 5 s.
FAIL-SAFE FUNCTION
POSSIBLE CAUSE
  • CAN communication line malfunction
  • CAN communication line malfunction with PCM
  • CAN communication line malfunction with DSC HU/CM
  • CAN communication line malfunction with instrument cluster
  • Instrument cluster malfunction
SYSTEM WIRING DIAGRAM -