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Home >> Kia >> 2022 >> EV6 GT-Line, AWD >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Vehicle Control System Diagnosis (2 Of 2) >> DTC U045D-82: Invalid Data Received From Chassis Control Module "A" >> Wiring Inspection >> Circuit Inspection

Circuit Inspection

G14910809Courtesy of KIA MOTORS AMERICA, INC.
G14910810Courtesy of KIA MOTORS AMERICA, INC.
E-CAN Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Resistance inspection (A/C control module, ICU)
  1. Ignition "OFF".
  2. Disconnect auxiliary battery (-) cable.
  3. Disconnect the connector(s) A/C control module, ICU.
 A/C control module (component side) 35 (E-CAN high) A/C control module (component side) 34 (E-CAN low) Approx. 120Ω
ICU (component side) 17 (E-CAN high) IICU (component side) 18 (E-CAN low) Approx. 120Ω
Open in circuit inspection (ADAS_DRV ↔ ICU)
  1. Ignition "OFF".
  2. Disconnect the connector(s) ADAS_DRV, ICU.
 ADAS_DRV connector 10 (E-CAN high) ICU connector 17 (E-CAN high) Approx. below 1Ω
ADAS_DRV connector 4 (E-CAN low) ICU connector 18 (E-CAN low) Approx. below 1Ω
E-CAN oscilloscope (ADAS_DRV)
  1. Ignition "ON".
  2. Measure the waveform using VMI of KDS.
 ADAS_DRV connector 10 (E-CAN high) Chassis ground - Fig.1 to 6
ADAS_DRV connector 4 (E-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
G14910811Courtesy of KIA MOTORS AMERICA, INC.
G14910812Courtesy of KIA MOTORS AMERICA, INC.
G14910813Courtesy of KIA MOTORS AMERICA, INC.
G14910814Courtesy of KIA MOTORS AMERICA, INC.
G14910815Courtesy of KIA MOTORS AMERICA, INC.
G14910816Courtesy 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 and 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
G14910817Courtesy of KIA MOTORS AMERICA, INC.
G14910818Courtesy of KIA MOTORS AMERICA, INC.
G14910819Courtesy of KIA MOTORS AMERICA, INC.
G14910820Courtesy of KIA MOTORS AMERICA, INC.
G14910821Courtesy of KIA MOTORS AMERICA, INC.
G14910822Courtesy of KIA MOTORS AMERICA, INC.

Good 

No Good 

Module Inspection
Inspection Item Inspection Condition (+) Probe (-) Probe Specification
Connector Terminal Connector Terminal
Power inspection (ADAS_DRV ↔ Chassis ground)
  1. Disconnect the connector(s) ADAS_DRV.
  2. Ignition "ON".
 ADAS_DRV connector 7 (power) Chassis ground - B+
Open in circuit inspection (ADAS_DRV ↔ Chassis ground)
  1. Ignition "OFF".
  2. Disconnect the connector(s) ADAS_DRV.
 ADAS_DRV connector 6 (ground) Chassis ground - Approx. below 1Ω

Good 

No Good 

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