DTC Troubleshooting: U0029
DTC U0029:
 F-CAN Communication Line Error
NOTE: Make sure the HDS communicates with the ECM/PCM and other vehicle systems. If it does not, go to DLC Circuit Troubleshooting:
  • R20A3 engine
  • K24Z3 engine
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch to LOCK (0) and then back to ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Is DTC U0029 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition and the charging system.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.
    Control Unit
    Connector
    ECM/PCM
    R20A3 engine: connector A (44P)
    K24Z3 engine: connector A (49P)
    SRS unit
    Connector A (39P)
    Gauge control module
    32P connector
    VSA modulator-control unit
    32P connector
    Navigation unit *1
    32P connector
    EPS control unit
    28P connector
    Yaw rate-lateral acceleration sensor
    4P connector
    ACC control unit *2
    20P connector
    E-pretensioner unit *2
    Connector B (14P)
    LKAS unit *3
    26P connector

    *1:
    With navigation
    *2:
    With ACC
    *3:
    With LKAS

Is DTC U0029 indicated with each individual unit disconnected?
YES -
Go to Step 7 .
NO -
Replace the control unit that was disconnected when DTC U0029 is not reset.■
  1. Turn the ignition switch to LOCK (0).
  1. Disconnect each control unit connectors in the table.
    Control Unit
    Connector
    ECM/PCM
    R20A3 engine: connector A (44P)
    K24Z3 engine: connector A (49P)
    SRS unit
    Connector A (39P)
    Gauge control module
    32P connector
    VSA modulator-control unit
    32P connector
    Navigation unit *1
    32P connector
    EPS control unit
    28P connector
    Yaw rate-lateral acceleration sensor
    4P connector
    ACC control unit *2
    20P connector
    E-pretensioner unit *2
    Connector B (14P)
    LKAS unit *3
    26P connector

    *1:
    With navigation
    *2:
    With ACC
    *3:
    With LKAS

  1. Disconnect the HDS from the data link connector.
  1. Check for continuity between body ground and the gauge control module 32P connector No. 21 and No. 22 terminals individually.
Is there continuity?
YES -
A short to ground in the wire.■
NO -
Go to Step 11 .