CAN COMMUNICATION SYSTEM PROBLEM SYMPTOMS TABLE

Tech Tips


  • Use the table below to help determine the cause of problem symptoms.

  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

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Result List of How to Proceed with Troubleshooting
Symptom Suspected Area Link

Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 1.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 1 is 70 Ω or more.

 Open in Bus 1 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 1 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 1 is below 54 Ω.

 Short in Bus 1 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 1 is suspected.

  • Resistance between CANH and +B in Bus 1 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 1 is below 6 kΩ.

 Short to +B in Bus 1 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 1 is suspected.

  • Resistance between CANH and ground in Bus 1 is below 200 Ω.

  • Resistance between CANL and ground in Bus 1 is below 200 Ω.

 Short to GND in Bus 1 Line

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Resistance between CANH and CANL is normal in Bus 1 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 1. Open in One Side of Bus 1 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 2.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 2 is 70 Ω or more.

 Open in Bus 2 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 2 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 2 is below 54 Ω.

 Short in Bus 2 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 2 is suspected.

  • Resistance between CANH and +B in Bus 2 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 2 is below 6 kΩ.

 Short to +B in Bus 2 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 2 is suspected.

  • Resistance between CANH and ground in Bus 2 is below 200 Ω.

  • Resistance between CANL and ground in Bus 2 is below 200 Ω.

 Short to GND in Bus 2 Line

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Resistance between CANH and CANL is normal in Bus 2 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 2. Open in One Side of Bus 2 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 3.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 3 is 70 Ω or more.

 Open in Bus 3 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 3 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 3 is below 54 Ω.

 Short in Bus 3 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 3 is suspected.

  • Resistance between CANH and +B in Bus 3 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 3 is below 6 kΩ.

 Short to +B in Bus 3 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 3 is suspected.

  • Resistance between CANH and ground in Bus 3 is below 200 Ω.

  • Resistance between CANL and ground in Bus 3 is below 200 Ω.

 Short to GND in Bus 3 Line

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Resistance between CANH and CANL is normal in Bus 3 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 3. Open in One Side of Bus 3 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 4.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 4 is 70 Ω or more.

 Open in Bus 4 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 4 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 4 is below 54 Ω.

 Short in Bus 4 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 4 is suspected.

  • Resistance between CANH and +B in Bus 4 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 4 is below 6 kΩ.

 Short to +B in Bus 4 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 4 is suspected.

  • Resistance between CANH and ground in Bus 4 is below 200 Ω.

  • Resistance between CANL and ground in Bus 4 is below 200 Ω.

 Short to GND in Bus 4 Line

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Resistance between CANH and CANL is normal in Bus 4 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 4. Open in One Side of Bus 4 Branch Line

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Either of the following:


  • The problem symptom is that of Problem Symptom Pattern B and the suspected area is in Bus 5.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 5 is 70 Ω or more.

 Open in Bus 5 Main Bus Line

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Either of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short between CAN bus lines (CANH and CANL) in Bus 5 is suspected.

  • Resistance between CAN bus lines (CANH and CANL) in Bus 5 is below 54 Ω.

 Short in Bus 5 Lines

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to +B in a CAN bus line (CANH or CANL) in Bus 5 is suspected.

  • Resistance between CANH and +B in Bus 5 is below 6 kΩ.

  • Resistance between CANL and +B in Bus 5 is below 6 kΩ.

 Short to +B in Bus 5 Line

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Any of the following:


  • The problem symptom is similar to that of Problem Symptom Pattern A and a short to ground in a CAN bus line (CANH or CANL) in Bus 5 is suspected.

  • Resistance between CANH and ground in Bus 5 is below 200 Ω.

  • Resistance between CANL and ground in Bus 5 is below 200 Ω.

 Short to GND in Bus 5 Line

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Resistance between CANH and CANL is normal in Bus 5 and the problem symptom pattern in How to Use "Communication Bus Check" Screen in Inspection matches the symptoms when there is an open in one wire of a branch line in Bus 5. Open in One Side of Bus 5 Branch Line

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Tech Tips

The suspected communication stop area can be determined based on the ECUs or sensors that are displayed as not communicating on the "Communication Bus Check" screen or "Communication Bus Check (Detail)" screen and by referring to the following table.

Communication Stop Mode Table (Open in bus line or other communication stop)
Symptom Suspected Area Link

Either of the following is met:


  • Communication stop for "Hybrid Vehicle Control" and/or "Hybrid Vehicle Control2" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Hybrid Vehicle Control" and/or "Hybrid Vehicle Control2" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Hybrid Vehicle Control" and/or "Hybrid Vehicle Control2" is 6 or more.)

 Hybrid Vehicle Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Skid Control (ABS/VSC/TRAC)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Skid Control (ABS/VSC/TRAC)" is 6 or more.)

 Skid Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Clearance Warning (Clearance Sonar)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Clearance Warning (Clearance Sonar)" is 6 or more.)

 Clearance Warning ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Air Conditioning Amplifier" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Air Conditioning Amplifier" is 6 or more.)

 Air Conditioner Amplifier Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Power Steering (EPS)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Power Steering (EPS)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Power Steering (EPS)" is 6 or more.)

 Power Steering ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Spiral cable (Steering Angle Sensor)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Spiral cable (Steering Angle Sensor)" is 6 or more.)

 Steering Angle Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "ECM (Engine)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "ECM (Engine)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "ECM (Engine)" is 6 or more.)

 ECM Communication Stop Mode

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Either of the following is met:


  • Communication stop for "HV Battery" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "HV Battery" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "HV Battery" is 6 or more.)

 Battery ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Plug-in Control" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Plug-in Control" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Plug-in Control" is 6 or more.)

 Plugin Charge Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Solar Charging Control" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Solar Charging Control" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Solar Charging Control" is 6 or more.)

 Solar Charge ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Main Body" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Main Body" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Main Body" is 6 or more.)

 Main Body ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Combination Meter" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Combination Meter" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Combination Meter" is 6 or more.)

 Combination Meter ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Certification (Smart)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Certification (Smart)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Certification (Smart)" is 6 or more.)

 Certification ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Airbag" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Airbag" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Airbag" is 6 or more.)

 Center Airbag Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Headlight swivel (AFS)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Headlight swivel (AFS)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Headlight swivel (AFS)" is 6 or more.)

 AFS ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Display and Navigation (AVN)" is 6 or more.)

 Radio Receiver Assembly Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Blind Spot Monitor Master" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Blind Spot Monitor Master" is 6 or more.)

 Blind Spot Monitor Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Display and Navigation (AVN)" is 6 or more.)

 Navigation Receiver Assembly Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Driving Support (Cruise Control-ACC)" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Driving Support (Cruise Control-ACC)" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Driving Support (Cruise Control-ACC)" is 6 or more.)

 Driving Support ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Head Up Display" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Head Up Display" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Head Up Display" is 6 or more.)

 Headup Display Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Radar" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Radar" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Radar" is 6 or more.)

 Millimeter Wave Radar Sensor Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Motor Generator" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Motor Generator" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Motor Generator" is 6 or more.)

 Motor Generator Control ECU Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Parking Assist Monitor System" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Parking Assist Monitor System" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Parking Assist Monitor System" is 6 or more.)

 Rear Television Camera Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Occupant Detection" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Occupant Detection" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Occupant Detection" is 6 or more.)

 Restraints Occupant Classification System Module Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Grill Shutter" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Grill Shutter" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Grill Shutter" is 6 or more.)

 Grille Shutter Communication Stop Mode

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Either of the following is met:


  • Communication stop for "Front Camera Module" is indicated on the "Communication Bus Check" screen of the GTS.

  • Communication stop history for "Front Camera Module" is indicated on the "Communication Bus Check (Detail)" screen of the GTS. (The Lost Communication Time value for "Front Camera Module" is 6 or more.)

 Front Camera Module Communication Stop Mode

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DTC Combination Table
Symptom Suspected Area Link
Although CAN communication is currently normal, an ECU connected to the CAN communication system has CAN communication DTCs. The probable part for which communication is interrupted can be determined using DTC Combination Table and comparing the DTCs output from ECUs connected to the CAN communication system.

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