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CAN register and communication line inspection

■ CAN register and communication line inspection 1 

  1. Ignition OFF.
  2. Connect all module connectors in proper locations.
  3. Measure resistance between terminal 3 and 11 of diagnostic connector.

    Specification:  About 60 Ω

  4. Is the measured resistance within specification?

    YES 

    • Check Each Module connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • Go to next procedure.

    NO 

    • If the measured value is out of specification, repair or replace 120Ω CAN register (Inside of ECM/PCM and Instrument Cluster) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If the measured value is lower than 10Ω, repair or replace CAN High and CAN Low are short each other. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If the measured value is ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • Go to next procedure.

■ CAN register and communication line inspection 2 

  1. IG "OFF".
  2. Disconnect ECM/PCM and Instrument Cluster connectors.
  3. Measure resistance between terminal CAN Low and CAN High of ECM/PCM and Instrument Cluster Modules.

    Specification:  About 120 Ω

  4. Is the measured value within specification?

    YES 

    • Go to next procedure.
    • If the measured value is out of specification, repair or replace 120Ω CAN register (Inside of ECM/PCM and Instrument Cluster) and then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • If the measured value is lower than 10Ω, repair or replace CAN High and CAN Low are short each other. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
    • If the measured value is ∞ Ω, repair or replace the open in CAN High/CAN Low circuit. And then, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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