NETWORKING: CAN COMMUNICATION SYSTEM: PROBLEM SYMPTOMS TABLE; 2020 MY Camry HV [09/2019

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.
Click here

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

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

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