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C-CAN Inspection

Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (CLU, ICU)
  1. Ignition "OFF".
  2. Disconnect the CLU, ICU connector.
 CLU (component side) 32 (C-CAN high) CLU (component side) 33 (C-CAN low) Approx. 120Ω
ICU (component side) 19 (C-CAN high) ICU (component side) 20 (C-CAN low) Approx. 120Ω
Open in circuit inspection (HECU ↔ FR_CMR)
  1. Ignition "OFF".
  2. Disconnect the HECU, FR_CMR connector.
 HECU connector 19 (C-CAN high) FR_CMR connector 10 (C-CAN high) Approx. below 1Ω
HECU connector 20 (C-CAN low) FR_CMR connector 4 (C-CAN low) Approx. below 1Ω
C-CAN oscilloscope (HECU)
  1. Ignition "ON".
 HECU connector 19 (C-CAN high) Chassis ground - Fig.1 to 6
HECU connector 20 (C-CAN low) Chassis ground -

Information 

It is important to check CAN high and low at the same time to check the waveform of the CAN communication line. The CAN signal is in a bus idle state based on 2.5V (digital "1"), the high signal rises to 3.5V, the low signal falls to 1.5V, and the voltage difference between the high and low signals is "0" when 2V occurs. Is detected. In addition, it monitors whether the high and low signals have opposite voltages based on 2.5V like the waveform on the left, and monitors whether the current CAN signal is transmitted normally. In CAN communication, a continuous "0" signal of 6 bits or more means occurrence of an error. 1 bit can be easily determined by obtaining the time when "SOF" (Start Of Frame), indicating the start of the frame, occurs. Check if the "0" signal of 6 bits or more occurs continuously during CAN communication waveform check.

  1. Reference voltage about 2.5V. (high: 2.5V → 3.5V rise, low: 2.5V → 1.5V drop)
  2. Idle (2.5V) section of a certain period.
  3. Constant data frame time.
  4. High and low symmetrical frame shape.
    G15723468Courtesy of KIA MOTORS AMERICA, INC.
    G15723469Courtesy of KIA MOTORS AMERICA, INC.
    G15723470Courtesy of KIA MOTORS AMERICA, INC.
    G15723471Courtesy of KIA MOTORS AMERICA, INC.
    G15723472Courtesy of KIA MOTORS AMERICA, INC.
    G15723473Courtesy of KIA MOTORS AMERICA, INC.

    Good 

    No Good 

    • Check for a short circuit between the wiring and the chassis ground.
    • Perform repair or replacement as necessary and perform the "VERIFICATION OF REPAIR " procedure.
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