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Circuit Inspection

G14910632Courtesy of KIA MOTORS AMERICA, INC.
G14910633Courtesy of KIA MOTORS AMERICA, INC.
M-CAN Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (AVN, ICU)
  1. Ignition "OFF".
  2. Disconnect auxiliary battery (-) cable.
  3. Disconnect the connector(s) AVN, ICU.
 AVN (component side) 7 (M-CAN high) AVN (component side) 20 (M-CAN low) Approx. 120Ω
ICU (component side) 31 (M-CAN high) IICU (component side) 32 (M-CAN low) Approx. 120Ω
Open in circuit inspection (AVN ↔ ICU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) AVN, ICU.
 AVN connector 7 (M-CAN high) ICU connector 31 (M-CAN high) Approx. below 1Ω
AVN connector 20 (M-CAN low) ICU connector 32 (M-CAN low) Approx. below 1Ω
M-CAN oscilloscope (AVN)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 AVN connector 7 (M-CAN high) Chassis ground - Fig.1 to 6
AVN connector 20 (M-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
G14910634Courtesy of KIA MOTORS AMERICA, INC.
G14910635Courtesy of KIA MOTORS AMERICA, INC.
G14910636Courtesy of KIA MOTORS AMERICA, INC.
G14910637Courtesy of KIA MOTORS AMERICA, INC.
G14910638Courtesy of KIA MOTORS AMERICA, INC.
G14910639Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

P-CAN Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (VCU, ICU)
  1. Ignition "OFF".
  2. Disconnect auxiliary battery (-) cable.
  3. Disconnect the connector(s) VCU, ICU.
 VCU (component side) 77 (P-CAN high) VCU (component side) 78 (P-CAN low) Approx. 120Ω
ICU (component side) 19 (P-CAN high) ICU (component side) 20 (P-CAN low) Approx. 120Ω
Open in circuit inspection (ICU ↔ VCU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) ICU, VCU.
 ICU connector 19 (P-CAN high) VCU connector 77 (P-CAN high) Approx. below 1Ω
ICU connector 20 (P-CAN low) VCU connector 78 (P-CAN low) Approx. below 1Ω
P-CAN oscilloscope (ICU)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 ICU connector 19 (P-CAN high) Chassis ground - Fig.1 to 6
ICU connector 20 (P-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
G14910640Courtesy of KIA MOTORS AMERICA, INC.
G14910641Courtesy of KIA MOTORS AMERICA, INC.
G14910642Courtesy of KIA MOTORS AMERICA, INC.
G14910643Courtesy of KIA MOTORS AMERICA, INC.
G14910644Courtesy of KIA MOTORS AMERICA, INC.
G14910645Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

Module Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Power inspection (AVN ↔ Chassis ground)
  1. Disconnect the connector(s) AVN.
  2. Ignition "ON".
 AVN connector 1, 30, 37 (power) Chassis ground - B+
Open in circuit inspection (AVN ↔ Chassis ground)
  1. Ignition "OFF".
  2. Disconnect the connector(s) AVN.
 AVN connector 14, 46 (ground) Chassis ground - Approx. below 1Ω

Good 

No Good 

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