DESCRIPTION
There may be a short circuit between the V bus main lines and/or CAN branch lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.
Symptom | Trouble Area |
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Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is below 54 Ω. |
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WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
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.
After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.
DTC check procedure: Turn the engine switch on (IG), wait at least 60 seconds, and then drive the vehicle at a speed of 40 km/h (25 mph) or more for 5 minutes or more.
After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.
Before replacing the main body ECU (multiplex network body ECU), ECM or certification ECU (smart key ECU assembly), refer to Service Bulletin.
Tech Tips
Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.
PROCEDURE
CHECK FOR SHORT IN CAN BUS LINES (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR)
Disconnect the cable from the negative (-) battery terminal.
*a | Front view of wire harness connector (to Combination Meter Assembly) |
Disconnect the O3 combination meter assembly connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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Result | |||
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OK |
REPLACE COMBINATION METER ASSEMBLY Click here |
NG |
CHECK FOR SHORT IN CAN BUS LINES (ECM - NO. 2 CAN JUNCTION CONNECTOR)
Reconnect the O3 combination meter assembly connector.
*a | Front view of wire harness connector (to ECM) |
Disconnect the A78 ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
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Result | |||
---|---|---|---|
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OK |
REPLACE ECM Click here |
NG |
CHECK FOR SHORT IN CAN BUS LINES (NO. 1 CAN JUNCTION CONNECTOR)
Reconnect the A78 ECM connector.
Disconnect the O104 No. 1 CAN junction connector.
*a | Front view of wire harness connector (to No. 1 CAN Junction Connector) |
*b | to No. 2 CAN Junction Connector (for V Bus) |
*c | to Combination Meter Assembly (for V Bus) |
*d | to Radio Receiver Assembly (for V Bus) |
*e | to Network Gateway ECU (for V Bus) |
*f | to Air Conditioning Amplifier Assembly (for V Bus) |
*g | to Stereo Component Equalizer Assembly (for V Bus) |
*h | to Certification ECU (Smart Key ECU Assembly) (for V Bus) |
*i | Torque Vectoring Differential ECU Assembly (w/ Torque Vectoring Differential System) (for V Bus) |
*j | to Power Steering ECU Assembly (for V Bus) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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*: w/ Torque Vectoring Differential System
Result | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
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A |
REPLACE NO. 1 CAN JUNCTION CONNECTOR |
C |
GO TO STEP 5 Click here |
D |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (COMBINATION METER ASSEMBLY - NO. 1 CAN JUNCTION CONNECTOR) |
B |
CHECK FOR SHORT IN CAN BUS LINES (NO. 2 CAN JUNCTION CONNECTOR)
Reconnect the O104 No. 1 CAN junction connector.
Disconnect the O105 No. 2 CAN junction connector.
*a | Front view of wire harness connector (to No. 2 CAN Junction Connector) |
*b | to No. 1 CAN Junction Connector (for V Bus) |
*c | to Main Body ECU (Multiplex Network Body ECU) (for V Bus) |
*d | to ECM (for V Bus) |
*e | to Airbag ECU Assembly (for V Bus) |
*f | to Yaw Rate Sensor (for V Bus) |
*g | Spoiler Control ECU Assembly (for V Bus) |
*h | to DLC3 (for V Bus) |
*i | to Steering Sensor (for V Bus) |
*j | to Skid Control ECU (Brake Actuator Assembly) (for V Bus) |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Result | ||||||||||||
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A |
REPLACE NO. 2 CAN JUNCTION CONNECTOR |
B |
REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION CONNECTOR) |
D |
REPAIR OR REPLACE CAN BRANCH LINES CONNECTED TO DLC3 |
E |
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM - NO. 2 CAN JUNCTION CONNECTOR) |
C |
CHECK FOR SHORT IN CAN BUS LINES (ECU, SENSOR)
Reconnect all wire harness connectors.
Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch lines are connected.
*1 | DLC3 |
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
---|---|---|---|---|---|---|
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Tech Tips
If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.
Result | |||
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|
OK |
REPLACE CORRESPONDING ECU OR SENSOR |
NG |
REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR |