Open in One Side of Bus 2 Branch Line
DESCRIPTION
When the CAN
bus main lines are normal (no open, short to ground, short to +B or
short between lines) and there is an ECU or sensor on the "Communication
Bus Check" screen that is indicated as not communicating or whose
connection status on the "Communication Bus Check" screen changes
intermittently, an open in one of the wires of a CAN bus branch line is
suspected.
HINT:
If there is
an ECU or sensor whose connection status changes intermittently while
checking the "Communication Bus Check" screen, there may be an open
circuit in one of the wires of a branch line of an ECU or sensor in the
bus. If an open occurs in one of the wires of a CAN branch line, it may
interfere with the communication of other ECUs or sensors resulting in
an incorrect state being displayed.
|
Symptom | Trouble Area |
|
There
is an ECU or sensor that is indicated as not communicating on the
"Communication Bus Check" screen or whose connection status on the
"Communication Bus Check" screen changes intermittently. |
One side of CAN branch line is open, or output signals are incomplete.
- Hybrid vehicle control ECU
- Brake booster with master cylinder assembly
- Inverter with converter assembly
|
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
- 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 
- After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the power switch on (IG) and
wait for 1 minute or more. Then operate the suspected malfunctioning
system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes
or more.
- After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
After the repair, perform the CAN bus check and check
that all the ECUs and sensors connected to the CAN communication system
are displayed as normal.
Click here
PROCEDURE
|
1. | CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH LINE |
(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.
Click here
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Using the Techstream, perform "CAN Bus Check".
CAN Bus Check
(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.
(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.
| NEXT |
 | GO TO CORRESPONDING COMMUNICATION STOP MODE |
Open in One Side of Bus 3 Branch Line
DESCRIPTION
When the CAN
bus main lines are normal (no open, short to ground, short to +B or
short between lines) and there is an ECU or sensor on the "Communication
Bus Check" screen that is indicated as not communicating or whose
connection status on the "Communication Bus Check" screen changes
intermittently, an open in one of the wires of a CAN bus branch line is
suspected.
HINT:
If there is
an ECU or sensor whose connection status changes intermittently while
checking the "Communication Bus Check" screen, there may be an open
circuit in one of the wires of a branch line of an ECU or sensor in the
bus. If an open occurs in one of the wires of a CAN branch line, it may
interfere with the communication of other ECUs or sensors resulting in
an incorrect state being displayed.
|
Symptom | Trouble Area |
|
There
is an ECU or sensor that is indicated as not communicating on the
"Communication Bus Check" screen or whose connection status on the
"Communication Bus Check" screen changes intermittently. |
One side of CAN branch line is open, or output signals are incomplete.
- Radio and display receiver assembly
- DCM (telematics transceiver)
|
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
PROCEDURE
|
1. | CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH LINE |
(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.
Click here 
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Using the Techstream, perform "CAN Bus Check".
CAN Bus Check
(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.
(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.
| NEXT |
 | GO TO CORRESPONDING COMMUNICATION STOP MODE |
Open in One Side of Bus 4 Branch Line
DESCRIPTION
When the CAN
bus main lines are normal (no open, short to ground, short to +B or
short between lines) and there is an ECU or sensor on the "Communication
Bus Check" screen that is indicated as not communicating or whose
connection status on the "Communication Bus Check" screen changes
intermittently, an open in one of the wires of a CAN bus branch line is
suspected.
HINT:
If there is
an ECU or sensor whose connection status changes intermittently while
checking the "Communication Bus Check" screen, there may be an open
circuit in one of the wires of a branch line of an ECU or sensor in the
bus. If an open occurs in one of the wires of a CAN branch line, it may
interfere with the communication of other ECUs or sensors resulting in
an incorrect state being displayed.
|
Symptom | Trouble Area |
|
There
is an ECU or sensor that is indicated as not communicating on the
"Communication Bus Check" screen or whose connection status on the
"Communication Bus Check" screen changes intermittently. | One side of CAN branch line is open, or output signals are incomplete.
- Occupant detection ECU
- Tire pressure warning ECU and receiver
- Rack and pinion power steering gear assembly
- Brake booster with master cylinder assembly
- Steering sensor
- ECM
- Brake actuator assembly
- Hybrid vehicle control ECU
|
CAUTION / NOTICE / HINT
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
NOTICE:
PROCEDURE
|
1. | CHECK FOR OPEN IN ONE SIDE OF CAN BRANCH LINE |
(a) Based on the vehicle equipment and specifications, confirm the systems that use CAN communication.
Click here 
(b) Connect the Techstream to the DLC3.
(c) Turn the power switch on (IG).
(d) Turn the Techstream on.
(e) Using the Techstream, perform "CAN Bus Check".
CAN Bus Check
(f) Observe the screen for approximately 2 minutes to check for ECUs and sensors that are displayed as not communicating.
(g) Perform the inspection as specified in the Problem Symptoms Table for the ECUs or sensors that are not communicating.
| NEXT |
 | GO TO CORRESPONDING COMMUNICATION STOP MODE |
