Toyota CH-R Service Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

  • 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

HINT:

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

Skid Control ECU Communication Stop Mode

Either of the following is met:

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

Air Conditioner Amplifier Communication Stop Mode

Either of the following is met:

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

Power Steering ECU Communication Stop Mode

Either of the following is met:

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

Steering Angle Sensor Communication Stop Mode

Either of the following is met:

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

ECM Communication Stop Mode

Either of the following is met:

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

Main Body ECU Communication Stop Mode

Either of the following is met:

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

Combination Meter ECU Communication Stop Mode

Either of the following is met:

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

Certification ECU Communication Stop Mode

Either of the following is met:

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

Center Airbag Sensor Communication Stop Mode

Either of the following is met:

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

Headlight ECU Communication Stop Mode

Either of the following is met:

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

Radio Receiver Assembly Communication Stop Mode

Either of the following is met:

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

Blind Spot Monitor Sensor Communication Stop Mode

Either of the following is met:

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

DCM Communication Stop Mode

Either of the following is met:

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

Millimeter Wave Radar Sensor Communication Stop Mode

Either of the following is met:

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

Front Camera Module Communication Stop Mode

Either of the following is met:

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

Restraints Occupant Classification System Module Communication Stop Mode

DTC Combination Table (Open in Bus1, Bus 2, Bus 4 or Bus 5.)

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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