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Circuit Inspection

G14910530Courtesy of KIA MOTORS AMERICA, INC.
G14910531Courtesy of KIA MOTORS AMERICA, INC.
C-CAN Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (SRSCM, ICU)
  1. Ignition "OFF".
  2. Disconnect auxiliary battery (-) cable.
  3. Disconnect the connector(s) SRSCM, ICU.
 SRSCM (component side) 27 (C-CAN high) SRSCM (component side) 26 (C-CAN low) Approx. 120Ω
ICU (component side) 21 (C-CAN high) ICU (component side) 22 (C-CAN low) Approx. 120Ω
Open in circuit inspection (SRSCM ↔ ICU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) SRSCM, ICU.
 SRSCM connector 27 (C-CAN high) ICU connector 21 (C-CAN high) Approx. below 1Ω
SRSCM connector 26 (C-CAN low) ICU connector 22 (C-CAN low) Approx. below 1Ω
C-CAN oscilloscope (SRSCM)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 SRSCM connector 27 (C-CAN high) Chassis ground - Fig.1 to 6
SRSCM connector 26 (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
G14910532Courtesy of KIA MOTORS AMERICA, INC.
G14910533Courtesy of KIA MOTORS AMERICA, INC.
G14910534Courtesy of KIA MOTORS AMERICA, INC.
G14910535Courtesy of KIA MOTORS AMERICA, INC.
G14910536Courtesy of KIA MOTORS AMERICA, INC.
G14910537Courtesy 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
G14910538Courtesy of KIA MOTORS AMERICA, INC.
G14910539Courtesy of KIA MOTORS AMERICA, INC.
G14910540Courtesy of KIA MOTORS AMERICA, INC.
G14910541Courtesy of KIA MOTORS AMERICA, INC.
G14910542Courtesy of KIA MOTORS AMERICA, INC.
G14910543Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

Module Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Power inspection (SRSCM ↔ Chassis ground)
  1. Disconnect the connector(s) SRSCM.
  2. Ignition "ON".
 SRSCM connector 10 (memory input) Chassis ground - B+
SRSCM connector 28 (ON/START input Chassis ground - B+
Open in circuit inspection (SRSCM ↔ Chassis ground)
  1. Ignition "OFF".
  2. Disconnect the connector(s) SRSCM.
 SRSCM connector 40 (ground) Chassis ground - Approx. below 1Ω

Good 

No Good 

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