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C-CAN Inspection

Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (ICU, CLU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) from ICU, CLU.
 ICU (component side) 19 (C-CAN high) ICU (component side) 20 (C-CAN low) Approx. 120Ω
CLU (component side) 32 (C-CAN high) CLU (component side) 33 (C-CAN low) Approx. 120Ω
Open in circuit inspection (ICU ↔ HECU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) from ICU, HECU.
 ICU connector 19 (C-CAN high) HECU connector 19 (C-CAN high) Approx. below 1Ω
ICU connector 20 (C-CAN low) HECU connector 20 (C-CAN low) Approx. below 1Ω
C-CAN oscilloscope (ICU)
  1. Ignition "ON".
 ICU connector 19 (C-CAN high) Chassis ground - Fig.1 to 6
ICU 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.
    G15718685Courtesy of KIA MOTORS AMERICA, INC.
    G15718686Courtesy of KIA MOTORS AMERICA, INC.
    G15718687Courtesy of KIA MOTORS AMERICA, INC.
    G15718688Courtesy of KIA MOTORS AMERICA, INC.
    G15718689Courtesy of KIA MOTORS AMERICA, INC.
    G15718690Courtesy of KIA MOTORS AMERICA, INC.

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