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Circuit Inspection

G14910492Courtesy of KIA MOTORS AMERICA, INC.
G14910493Courtesy of KIA MOTORS AMERICA, INC.
G-CAN Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (BMS, ICU)
  1. Ignition "OFF".
  2. Disconnect auxiliary battery (-) cable.
  3. Disconnect the connector(s) BMS, ICU.
 BMS (component side) 20 (G-CAN high) BMS (component side) 19 (G-CAN low) Approx. 120Ω
ICU (component side) 29 (G-CAN high) IICU (component side) 30 (G-CAN low) Approx. 120Ω
Open in circuit inspection (Front inverter ↔ ICU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) Front inverter, ICU.
 Front inverter connector 1 (G-CAN high) ICU connector 29 (G-CAN high) Approx. below 1Ω
Front inverter connector 2 (G-CAN low) ICU connector 30 (G-CAN low) Approx. below 1Ω
Open in circuit inspection (Rear inverter ↔ ICU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) Rear inverter, ICU.
 Rear inverter connector 1 (G-CAN high) ICU connector 29 (G-CAN high) Approx. below 1Ω
Rear inverter connector 2 (G-CAN low) ICU connector 30 (G-CAN low) Approx. below 1Ω
G-CAN oscilloscope (Front inverter)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 Front inverter connector 1 (G-CAN high) ICU connector - Fig.1 to 6
Front inverter connector 2 (G-CAN low) ICU connector -
G-CAN oscilloscope (Rear inverter)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 Rear inverter connector 1 (G-CAN high) Chassis ground - Fig.1 to 6
Rear inverter connector 2 (G-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
G14910494Courtesy of KIA MOTORS AMERICA, INC.
G14910495Courtesy of KIA MOTORS AMERICA, INC.
G14910496Courtesy of KIA MOTORS AMERICA, INC.
G14910497Courtesy of KIA MOTORS AMERICA, INC.
G14910498Courtesy of KIA MOTORS AMERICA, INC.
G14910499Courtesy 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) 56 (P-CAN high) VCU (component side) 57 (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) VCU, ICU.
 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
G14910500Courtesy of KIA MOTORS AMERICA, INC.
G14910501Courtesy of KIA MOTORS AMERICA, INC.
G14910502Courtesy of KIA MOTORS AMERICA, INC.
G14910503Courtesy of KIA MOTORS AMERICA, INC.
G14910504Courtesy of KIA MOTORS AMERICA, INC.
G14910505Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

Module Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Power inspection (Front inverter ↔ Chassis ground)
  1. Disconnect the connector(s) Front inverter.
  2. Ignition "ON".
 Front inverter connector 24 (ON/START Input) Chassis ground - B+
Front inverter connector 34 (IG3 input) Chassis ground - B+
Front inverter connector 33, 38 (Memory power) Chassis ground - B+
Open in circuit inspection (Front inverter ↔ Chassis ground)
  1. Ignition "OFF".
  2. Disconnect the connector(s) Front inverter.
 Front inverter connector 35, 40 (ground) Chassis ground - Approx. below 1Ω
Power inspection (Rear inverter ↔ Chassis ground)
  1. Disconnect the connector(s) Rear inverter.
  2. Ignition "ON".
 Rear inverter connector 24 (ON/START Input) Chassis ground - B+
Rear inverter connector 34 (IG3 input) Chassis ground - B+
Rear inverter connector 33, 38 (Memory power) Chassis ground - B+
Open in circuit inspection (Rear inverter ↔ Chassis ground)
  1. Ignition "OFF".
  2. Disconnect the connector(s) Rear inverter.
 Rear inverter connector 35, 40 (ground) Chassis ground - Approx. below 1Ω

Good 

No Good 

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